Sun Nuclear 1133 Wireless Dosimetry User Manual

Sun Nuclear Corporation Wireless Dosimetry Users Manual

Users Manual

- 1 -OPERATING INSTRUCTIONSRadio Frequency – In-Vivo Dosimeter"rf-IVD"Model 1133NOTICE: This device complies with Part 15 of the FCC Rules. Operationis subject to the following two conditions: (1) this device may not causeharmful interference, and (2) this device must accept any interferencereceived, including interference that may cause undesired operation.FCC ID: G6P1133INFORMATION TO USER: Caution, any changes or modifications notexpressly approved by Sun Nuclear Corporation could void the user'sauthority to operate this equipment.Display Firmware: 0100Turtle Firmware: 0100Base/Pod Firmware: 0100October 18, 2000DESIGNED AND MANUFACTURED BYSUN NUCLEAR CORPORATIONMELBOURNE, FL USA321-259-6862http://www.sunnuclear.com
- 2 -1. INTRODUCTION.................................................................................................................................................................. 3SPECIFICATIONS................................................................................................................................................................... 3Diode Detector Inputs .......................................................................................................................................................... 3Component Definitions, size and weight .............................................................................................................................. 3Power.................................................................................................................................................................................... 4Display Module .................................................................................................................................................................... 4Detector Pod/Base Station ................................................................................................................................................... 4Turtle .................................................................................................................................................................................... 5DESCRIPTION:............................................................................................................................................................................ 5Display Module Front Panel................................................................................................................................................ 5LCD Display......................................................................................................................................................................... 6Available Keys and LEDs..................................................................................................................................................... 62. DISPLAY AND DETECTOR POD OPERATION............................................................................................................. 7A. SETUP ................................................................................................................................................................................... 7B. POWER ON............................................................................................................................................................................ 7C. MEASUREMENT OPERATION................................................................................................................................................. 71. General............................................................................................................................................................................. 72. Starting the display: ......................................................................................................................................................... 83. Display the splash screen:................................................................................................................................................ 84. Finding the components: Turtle, Base Station and Measurement Pod............................................................................ 85. Background collection screen:....................................................................................................................................... 106. Dose collection screen or Main Screen: ........................................................................................................................ 107. Wireless measurements and Hard-wired measurements................................................................................................ 12D. MENU OPERATION.............................................................................................................................................................. 121. Select System .................................................................................................................................................................. 122. Check Battery ................................................................................................................................................................. 133. Display Adjust ................................................................................................................................................................ 134. Set Time/Date ................................................................................................................................................................. 155. View software version .................................................................................................................................................... 156. Dose Calibration ............................................................................................................................................................ 157. Review and print calibration.......................................................................................................................................... 198. Temperature Coefficient Calibration ............................................................................................................................. 199. Select Dose Units............................................................................................................................................................ 2410. Set device ID................................................................................................................................................................. 2411. Toggle Physics mode on and off................................................................................................................................... 2512. Enter or Change Pin..................................................................................................................................................... 2513. System Setup................................................................................................................................................................ 2614. View software version .................................................................................................................................................. 26E. MAINTENANCE.................................................................................................................................................................... 271. Detector POD/Base Station............................................................................................................................................ 272. Turtle .............................................................................................................................................................................. 273. PRINTOUTS......................................................................................................................................................................... 29A. GENERAL............................................................................................................................................................................ 29B. REPO RT LAYOUTS............................................................................................................................................................... 291. Intermediate Dose Report .............................................................................................................................................. 292. Dose Report.................................................................................................................................................................... 303. Intermediate Charge Report........................................................................................................................................... 304. Charge Report ................................................................................................................................................................ 315. Dose Calibration Report ................................................................................................................................................ 316. Charge Calibration Report ............................................................................................................................................ 324. CALCULATIONS................................................................................................................................................................ 32A. BACKGROUND .................................................................................................................................................................... 32B. IRRADIATING THE POD........................................................................................................................................................ 33C. DATA COLLEC TION ............................................................................................................................................................. 33D. COMPUTING TEMPERATURE CORRECTION FACTOR............................................................................................................ 34E. COMPUTING DOSE CALIBRATION FACTOR FOR ENERGY BUTTON 'BTN'............................................................................... 34
- 3 -1. IntroductionThe Sun Nuclear model 1133 rf-IVD (or wireless IVD) is a system that measures the radiation output of aradioactive substance such as a Co-60 source or a linear accelerator, during the treatment of a patient. Thesystem consists of 4 components: Display Module (user interface), Turtle (Communication Hub), Base Station (rftransmitter and receiver), and Detector Pod (rf transmitter and receiver). The Base Station and Detector Pod areidentical and are interchangeable through system setup. The diode radiation detectors are connected to theDetector Pod through coaxial BNC connectors.The radiation therapist connects the radiation detectors (diodes) to the Detector Pod and then positions them onthe patient in order to measure the radiation from the accelerator. At this time, the patient is on the treatmentcouch of the accelerator, already positioned for treatment. The detector pod is battery operated and is positionedwithin 3 to 10 feet of the beam entrance to the patient. Also at this time, the beam is not on and the rf-IVD is notmaking a dose measurement.The therapist then leaves the treatment room that is shielded with approximately 3 feet of concrete and a heavyinterlocked door. The patient is restrained on the couch because the treatment plan requires position accuracy towithin millimeters, therefore no movement is allowed. Dose measurement is then remotely started on the rf-IVDfrom the Display Module in the control room and the accelerator beam turned on. A treatment fraction generallylasts for ½ minute or so. When the beam turns off, the rf-IVD is stopped and the dose value is displayed. The rf-IVD display value is recorded or printed on an accessory printer. The therapist then enters the room and removesthe detector from the patient.The recorded rf-IVD measurement is a QA test that verifies the dose output during treatment from the radiationmachine. The actual treatment plan is calculated in the Treatment Planning Computer (TPC – not part of the rf-IVD) which uses dosimetry data acquired from a NIST traceable calibrated ion chamber and 3D water phantom.The plan output should also include the "expected" dose at the point of the IVD detector placement. Then themeasured IVD dose and the expected TPC dose can be compared for verification. If the expected dose is notverified, the measured dose should not be used to adjust future treatments. Instead, an investigation should beconducted as to why the error occurred. The IVD is calibrated at the institution using the NIST traceable calibratedion chamber as a standard, the same standard that is used to calibrate the accelerator and the TPC. Therefore,the IVD offers a closed loop QA test of the implementation of the plan.SPECIFICATIONSDiode Detector InputsQuantity: 3Connector Type: BNC coax, 2 lugDetector Temperature Compensation: Auto, within 0.1 °C (negative detector current only)Calibration: User calibrated against ion chamber standardRepeatability: ± 0.2% or ± 0.1 cGyDetector Requirements: n or p type diodes responding between 5 to 100 nC/GyPolarity: Bipolar, i.e., measures positive or negative detector currentCurrent Limit: ± 40 nA average radiation current or 1.0 nC per radiation pulseLeakage: Auto compensationWarm-up Time: < 30 secondsEnvironmental Temperature: 15 °C to 32 °CRelative Humidity: 10% to 90% rh, non condensingComponent Definitions, size and weightDetector Pod: Measure dose received by diode detectors, 3 diodes per pod; 7x12x3 cm, 340 gmBase Station: Data relay between wireless Detector Pod and Turtle; 7x12x3 cm, 340 gmTurtle: Hardwired communication hub (RS-232 or USB) between PC, Display, and Pod or Base Station;7x12x3 cm, 340 gmDisplay: User keypad and display module for start and display of dosimetry measurements; 14x16x3.5 cm, 780 gmPrinter: Seiko Thermal DPU-414, serial port to Display, 9x320 dots/line, 40 column=9 cm; 16x17x6.6 cm, 580 gmCable: Display unit to Turtle (communicator) via 8 pin modular connector/cable, 2.4 m.Cable: Turtle to Base Station (located in treatment room) via 6 pin modular connector/cable, 25 m.
- 4 -Frequency: 916.5 MHz for USA and Canada, 868.35 MHz for European UnionPowerDetector Pod, Turtle: Rechargeable NiMH battery, 12 hour on full chargeDisplay: operating on 100-240 VAC, 47-63 Hz MainsTurtle, Base Station:a) Share Display Module's 15 VDC converter when Turtle's DC input jack is connected to 2nd jack on DisplayModule's front panelb) Operates on internal rechargeable NiMH battery, 12 hour on full charge when Turtle's DC input jack is notconnected to 2nd jack on Display Module's front panelElectrical Isolation: Wireless – through radio frequency communication, Manchester encoded Hardwired – through optical isolation in Turtle when Turtle's DC input jack is not connectedDisplay ModuleDose Range: 0 to 99.999 Gy; 0 to 9999.9 cGy; 0 to 9999.9 RDisplay: LCD, 2 line, 16 character/line, 8 mm character height, adjustable backlight and contrastFunctions: Dose Measurement, Calibration of Dose and Temperature Coefficient, Password protection, self diagnosticsMeasurement: 2 key stroke, select Energy key to start measuring, select Stop when finished.Firmware: Field updateableKeypad: 5 control keys – Function, Enter, Stop, Print, Increment12 energy keys (also serve as numeric key entry)End Panel:J3: 8 pin modular data connector, to Turtle. (For optical isolation reasons, there is no power on this connector)J4: 9 pin D Type connector, RS-232 portS1: Reset switchIN: Power input, +9 to +20 VDC, Barrel type connectorOUT: Power output to Turtle (in parallel with IN connector)Detector Pod/Base StationFunctions:a) As Detector Pod, measure detector current and transmit data to the Base station via rf communicationb) As Base Station, relay data and commands between Detector Pod and Display Module via wireFirmware: Field updateableEnd Panel 1:A, B, C: Two lug BNC input connectors for diode detectorsDS1: Green LED – Battery Charge StatusDS2: Green LED – Operational Error StatusEnd Panel 2:J5: 6 pin modular power/data connector…a) to Turtle when used as Base Station during rf transmissionb) to Turtle when hardwired as Detector Podc) to Base Station when used as Detector Pod (For Detector Pod Battery Charging Only)DC +15V: Power input, +9 to +20 VDC, Barrel type connector (For Battery Charging Only)BAT 0-1: Battery Switch; 0=OFF, 1=ON, must be on in order to charge the batteryJ6: 6 pin modular connector…a) to Detector Pod when used as Base Station (For Detector Pod Battery Charging Only)b) to 2nd Detector Pod when daisy chaining when not communicating by rfDS3: Green LED – Transmit StatusDS4: Green LED – Receive StatusThe RF Transceiver SpecificationFrequency: 916.5MHz Fixed frequency, +/- 0.2MHz.Power: 94 dBuV/m.Modulation: On/Off Keyed.Baud rate: 4630 bits/sec.Antenna: 50 Ohm, ¼ wave, helical whip. Mounts via “Reverse SMA” connector.
- 5 -TurtleFunctions: When powered from battery, provides optical isolation to hardwired Detector Pod; Provides communication statusand error diagnostics, serves as communication hubFirmware: Field updateableEnd Panel 1:J1: 9 pin D Type connector, RS-232 portJ2: 8 pin modular data connector, to Display Module. (For optical isolation reasons, there is no power on thisconnector)End Panel 2:J5: 6 pin modular power/data connector…(power is received from DC+15 jack when plugged in)a) to Base Station during rf transmissionb) to Detector Pod when hardwiredTX: Green LED – Data TransmitEN: Green LED – Enable StatusRX: Green LED – Data ReceiveDS1: Green LED – On during 10 second Download wait ("Initializing, Please Wait" display message)DS2: Green LED – On when running code during normal operationDS3: Green LED – On when failure has occurredDS4: Green LED – Not used in this revisionDC+15V: Power input, +9 to +20 VDC, Barrel type connector – power is then routed to J5BAT 0-1: Battery Switch; 0=OFF, 1=ON, must be on in order to charge the batteryDescription:The rf-IVD has been designed for radio frequency communication between the Detector Pod (located in the treatment room)and the Display (located in the control room) via an intermediate rf transmitter and receiver, called a Base Station (alsolocated in the treatment room). This removes the need for a cable to the treatment couch. The detectors are positioned on thepatient, with the small Detector Pod positioned on the couch, next to the patient and out of the beam. The measurement isremotely controlled from the Display via rf transmissions.The system can also be used without rf communication, with two possible configurations:a) "permanently" connect the Detector Pod to the Turtle, eliminating the Base Station from the system, via a 6 pin modulartelephone connector and cable pulled through the conduit and receive data transmissions during treatment, orb) "temporarily" connect the Pod and Turtle in order to get a Start measurement command from the Display, then relocate thePod to the treatment room and treat, and then reconnect the Pod and Turtle to transfer the measured data to the Display. Here,the cable can be short. This is essentially the most economical wireless IVD, but requires more effort to get the data.The rf or cable communication configurations are transparent to the software in the rf-IVD devices.The duty cycle of the radio frequency communication is 11.2% during standby (background measurement with once persecond handshake) and 12.5% during dosimetry measurement. If the unit is left on the entire day, the upper limit of rfcommunication per hour is 430 seconds per hour.If the Detector Pod is left on the charger while not in use, then the following will estimate rf communication time per hour.Typical measurement time is ½ minute per treatment field, with typically 3 treatment fields per patient. IVD is normallyperformed only on the first treatment fraction, with a repeat on the second fraction if the IVD measurement error exceedsspecified limits. Typically 30 to 40 patients are being treated at any given time period, a treatment lasting about 6 weeks. Thisresults in about one new patient per day, with an IVD measurement occurring on the first of 30 treatment fractions or on achange in a treatment field. This results in about 2 or 3 patients per day with an IVD measurement. Therefore, the upper limitof rf communication per day during measurement is nominally 0.5 min/field * 3 fields/patient * 3 patients/day = 3 minutes, or22.5 seconds per hour.The radio frequency communication is only performed in the treatment vault, which is a shielded room having solid highdensity concrete walls and ceiling, typically 3 feet thick. The treatment vault must be well shielded to protect personnel fromvery high energy x-rays (20 MV) and is built on the ground floor of the institution. These vaults do not transmit radiofrequency radiation.Display Module Front PanelFor users of the Sun Nuclear model 1131 IVD system, the model 1133 rf-IVD Display module is similar in appearance butsignificantly different in operation to the 1131 IVD Display module. However, the 1131 and 1133 Display Modules are NOT
- 6 -interchangeable. The chassis, keyboard, and display are essentially the same between both units, however the internal designis completely different, the 1133 Display module has the ability to calibrate the system, removing the need of the PC.Example Display, using a 2 line, 16 character display:A=123.4 B=099.8C=267.7 cGyA=123. 4 B=099. 8C=267. 7 cGyFunction Keys: οREADY οACTIVE οLOW BAT!!!!! INC PRINT STOP ENTER MENUEnergy Buttons:! 1 ! 2 ! 3! 4 ! 5 ! 6! 7 ! 8 ! 9! !! 0 ! "(The numbers and symbols next to the energy keys are light gray.)LCD DisplayThe LCD screen on the display module is a 32 (16x2) character back lit display. The LCD is used to display measurements aswell as abbreviated instructions to prompt the user during special modes. These instructions consist of primary and alternate(alt) screens, the alt screens are hints for a reminder to the user. A full reading of these operating instructions will benefit thenuser in the use of the LCD during special modes.Available Keys and LEDs12 Calibrated acquire/Numeric entry buttons-These buttons are used for starting acquisition, and entering numbers. The energy button's LED is lit when it's button hasbeen calibrated. An energy button's LED blinks when it is the active button while acquiring, or when there is a displayedmeasurement from a previous acquire.Each energy button has a gray alternate number entry/arrow function associated with itINC button-The INC button is used to scroll through the displayed Calibration Factors.
- 7 -PRINT button-The PRINT button is used to send data to the optional printer.READY led-The READY LED will be lit when there is a calibrated button and we are ready to acquire. Ready will go out when we areactively acquiring.STOP button-The STOP button is used to stop an acquisition, enter spaces for numeric entry, and cancel any of the menu modes.ACTIVE led-When a calibrated button is pushed, the ACTIVE button will be lit, and the READY LED will go out.ENTER button-The ENTER button is used as a general purpose button for acknowledging that the user wants to accept this action.MENU button-The MENU button is used to increment through a list of menu items for selecting setup items.LOW BAT led-If base station, turtle, or pod battery is discharging and the running time is <30 minutes:Turn ON the Display LO_BAT LED.Display a Low Battery ALT message.If base station, turtle, or pod battery is discharging and the running time is <0 minutes:Flash the Display LO_BAT LED.NOTE: Minutes is defined, from the units Battery Data. (g_bat_ram_buf[0]CHARGE / 110 mA)2. Display and Detector Pod OperationA. SetupConnect Display unit to power adapterConnect Display unit to Turtle (communicator) via 8 pin modular connector/cable, 2.4 m and 2 conductor power cable.Connect Turtle to Base Station (located in treatment room) via 6 pin modular connector/cable, 25 m.Detector Pod is located in treatment room, turned on and connected to another power adapter to keep battery charged whilenot in use.B. Power OnTurtle gets power from Display unit after power is turned on or from the Turtle's internal batteries.Base Station gets power from Display unit after power is turned on or base station's internal batteries.Disconnect power adapter from Detector Pod.C. Measurement Operation1. GeneralALT ScreensIf screen does not change after 5 seconds because the user may be stuck on what to do, then toggle display betweenScreen (5 sec time) and its Alt Screen (2 sec time) which appears just below the screen information. The Alt screenshows hints on what to do.Cursor Location and MovementThe left and right arrow keys on the keypad can be used to move the cursor without a numeric entry. If the cursor ison the top line in a numeric entry location and the right cursor is pressed to the end of the numeric field, then the
- 8 -next press will advance to the first numeric location on the bottom line. Advancement will continue to the right untilthe last numeric field location and then jump back up to the top left…Numeric EntryWhen the cursor is blinking on a screen location, a numeric entry is expected at that location. Numeric entries areleft justified. When the numeric key is pressed, the screen location updates with that entry and the cursor locationautomatically advances to the next location. The STOP key will enter a blank.Administrator PIN (personal identification number)The administrator PIN is used to password protect certain menu items. The PIN number is setup in the "Pin Setup"MENU item. Default for the "Pin Setup" screen will be 0. If the PIN is unknown, user may key in "911", at the "PinSetup" to get the stored PIN. After 911 is entered, then fill in the stored PIN and allow ENTER to continue. Whenentering the PIN, display the value. Whether a Pin is required or not is noted next to the menu item description.2. Starting the display:When the DC power jack is connected to the AC/DC convertor, the display will power up and display the following message.Screen 2.C.2.1 Initializing,Pl eas e wai t# While this screen is displayed, the software can be downloaded to the display flash memory. It should stay upfor 10 seconds to allow the start of the download process. See "Updating the display software" section for moreinformation.# Normal operation will not download because the Display already contains the program in flash memory.Normal operation should leave power on at all times to avoid the delay.3. Display the splash screen:After the 10 second delay during Initialization, the following screen is displayed.Screen 2.C.3.1 Sun Nucl ear Cor pRF- I VDThis screen should stay up for 2 seconds, during this time, look for the system components.4. Finding the components: Turtle, Base Station and Measurement PodThe system components must first establish communication. The display has a memory of how the system was lastconfigured and looks for the components according to that definition. The following screens guide the user in connecting thesystem according that definition, which can be changed by two menu choices of 'Select System' which allows a previouslystored configuration to be selected, or 'Set System' which allows a new system to be defined. Since the Base Station andDetector Pod are identical, they can be exchanged in function. They both have unique ID codes that the Display Modulereads. Therefore, there are two possible system configurations when the facility uses the rf-IVD in a wireless configuration.If the facility has another Detector Pod, making a total of 3, then there are six possible system configurations.Screen 2.C.4.1 Fi ndi ng Syst em nMENU: New syst em# If there is no turtle found, display Alt 2.C.4.1(a).# If MENU is pressed, limit menu selection to 'Select System' and 'Set System'.# 'n' refers to the system id code
- 9 -Alt 2.C.4.1(a) Tur t l e#1Power not ON# If there is no base found, and the current system number specifies a base station, display Alt 2.C.4.1(b).Alt 2.C.4.1(b) Base#99Power not ON# If there is no Pod found, display Alt 2.C.4.1(c).# '99' refers to the id code of the module, a value between 02 and 15Alt 2.C.4.1© Pod#99Power not ON# If there is a base/and or pod found, but the current system number specifies a different base station, display Alt2.C.4.1(d).Alt 2.C.4.1(d) Base#99Wa n t B a s e = 9 9# For example, if Base id 03 was found but system last used base id 04, then "Want Base=04" will be displayed.# If there is a base and/or pod found, but the current system number specifies a different Pod, display Alt2.C.4.1(e).Alt 2.C.4.1(e) Base#99 Pod#99Want #99 #99# For example, if the system is defined as Base = module ID#04 and Pod = module ID #03, but module ID#03 isconnected as a Base and module ID#04 is connected as a Detector Pod, then the display would indicated line 1as "Base#03 Pod#04" and line 2 as "Want #04 #03", with the columns aligned as in 2.C.4.1(e)# Line up the columns for the numbers under each other. If no base is found, leave that item off the screen butleave the pod item as shown at the end.# When powering up for the first time, remove the bottom line of Alt 2.C.4.1(e) since there is no defined system.After there is at least 1 system setup, then look for the last system used.# If all the hardware for this system is found, go on to the Background collection screen.# Continue going through all the ID's until the correct id's for the current system are found. The user can nowmake the proper connections to the modules and the Display will eventually identify them. The modules may bepower cycled during this procedure.# On first contact with a Detector Pod, the Display will download the calibrated Inputs flag to tell if any inputsare calibrated for a particular button for this Pod.# If a legitimate hardware system is found, but does not agree with the last system setting, push the MENU keyfor limited menus of 2.D.1 and 2.D.13.1. "System Select" to select a different system.2. "System Setup" to save this system with a system number.
- 10 -5. Background collection screen:Screen 2.C.5.1 Me a s u r i n gBACKGROUND 30Alt 2.C.5.1(a): Pl eas e wai t 25# If communication with the pod is lost for 5 seconds, while doing background , replace Alt 2.C.5.1(a) with Alt2.C.5.1(b) and Alt 2.C.5.1(c). If ENTER is pushed, this will take you back to Screen 2.C.4.1.# This is the initial background collection screen before data acquisition. Once an acquisition has been completed,the Main screen will be displayed while background collection is done.# The background will be collected for 30 seconds at once per second. See the Calculations, Background sectionfor the background collection procedure. After 30 seconds of background is collected, go to the Dose collectionscreen/Main screen.# Measurement with energy key is allowed during this 30 second period.Alt 2.C.5.1(b) Syst em1 LostCommuni cat i onAlt 2.C.5.1(c) ENTER to rest art6. Dose collection screen or Main Screen:Screen 2.C.6.1 and Alt 2.C.6.1(a) are displayed only before the first acquisition is done.Screen 2.C.6.1 ENERGY KEY t oSt ar t measur i ng# With this message displayed, the system is ready to make a measurement. The energy keys that have calibrationvalues for connected detectors will have there corresponding LEDs lighted.Alt 2.C.6.1(a) ME NU f o r mo r eopt i onsScreen 2.C.6.2 is displayed after the first and subsequent acquisitions are done.Screen 2.C.6.2 A=9. 9 B=9. 9C=9 . 9 c Gy p
- 11 -# The displayed dose is the typical screen that will be seen when the IVD is idle after a dose has been measured.The value will stayed on the screen until the next measurement. The lower case 'p' on the lower right portion ofthe screen is displayed while in the physics mode. The physics mode allows the use of the Detector Modulewhile it is plugged into the line supply. It is pass word protected, i.e., a personal identification number must beentered in order to enter physics mode. Units are selected in a menu item, discussed later.Alt 2.C.6.2(a) Mesur i ng , pl easewa i t# If communication is lost during acquisition, display Alt 2.C.6.2(a).# The READY LED will be lit when there is a calibrated button.# When a calibrated Energy button is pushed, the ACTIVE button will be lit, and the READY LED will go out.# Units will be selected by the user in the menu item "Dose Units". They include cGy (centi Grays), Gy (Grays),and Rad (Rads).# Dose display will be in the following format:1. cGy and Rads format A=0.0 Left justified. range 9999.9 to -999.92. Gy format A=0.0 Left justified. range 99.999 to -9.999# When an un-calibrated button is pushed, then display nominal charge in nC (nano Coulomb).# A 'p' will be displayed in the lower right corner of the Dose collection screen if we are in physics mode.# When not acquiring, background is being collected# A '~ ' will be displayed in the ' = ' sign position to let the user know when a bad background was collected. i.e.accelerator was on, or excessive leakage. See the Calculations, Background section for the backgroundcollection procedure.Battery StatusIf base station, turtle, or pod battery is discharging and the running time is <30 minutes display the Low Batteryscreen Alt 2.C.6.2(b) .Alt 2.C.6.2(b) LOW Bat t er y: Mi nT999 P999 B999# Unit Name P= Pod, B= Base station, T= Turtle# Display minutes-30 of running time left.# Minutes= (CHARGE / 110 mA). Note: The calculation "minutes-30" gives a 30 minute safety net.Safe Power – Charging BatteryIf the pod is connected to the dc jack or the battery is not discharging, (the measurement pod has power), displaythe Disconnect power plug screen Alt 2.C.6.2(c). Don't allow data collection unless in physics mode.Alt 2.C.6.2(c) Char gi ng Bat t er yDo Not Measur eBeam on ReminderIf beam is on when the STOP key is pushed, display the "Beam is On" Screen, Alt 2.C.6.2(d) with Screen 2.C.6.2Alt 2.C.6.2(d) BEAM i s ON STOPor ENTER t o Cont# Push the STOP key to stop acquisition, display final dose, and return to collecting background.# Push the ENTER key to continue the measurement.# If the beam is on when an Energy key is pressed and active, do nothing.
- 12 -# If the beam is on when an Energy key is pressed while the Ready LED is lit, the background condition willhandle this by replacing '=' with '~'. Continue measurement.7. Wireless measurements and Hard-wired measurementsThere are two possible configurations for measurements, with and without a Base Station. The Base station isrequired for rf communication between the Display module and Detector Pod. However, since the Detector Pod isbattery operated, it is possible to connect it directly to the Turtle which can also be battery operated for safeoperation. The measurement sequence is shown below in figure 1. Once done with the measurement, the backgroundsequence is started again.D. Menu OperationThe menu is accessible from the Main menu when acquisition is not going on. Each menu item has a normal screen.The Alternate screen is shown below Alt 2.D.1 is used with all top level menu selections.Alt 2.D.1 Pr ess MENU f ornext i t em# At any time while going through the menu, the STOP key can be used to leave the menu and return to the Mainscreen.1. Select SystemScreen2.D.1.1 Sy s t em Sel ec tPr es s ENTERThis menu item is used to select which system configuration is active. Administrator pin is not needed.Screen2.D.1.2 Us e Nu mb e r s t oChange Syst em=10Alt2.D.1.2(a) ENTER= Conf i r mSTOP = Abor t# There can be from 1 - 10 configurations# Use the number keys to enter a configuration number.# A system configuration is defined as a Turtle with ID 1, a measurement pod with a unique id from 2 to 15.If a wireless setup is being used, then a Base station with a unique id from 2 to 15 is also used. The systemconfiguration is used to ensure that all the correct pieces are connected, and those pieces are incommunication.# Pushing the ENTER key selects that system ID entered in 2.D.1.2, leaves the menu item, and goes back tothe Main screen# Pushing the STOP key leaves this menu item, and goes back to the Main screen.# A System is defined in the menu item "System Setup".
- 13 -2. Check BatteryScreen2.D.2.1 Bat t er y CheckPr es s ENTERThis menu item is used to check the battery Minutes left and the state of the battery. Administrator pin is notneeded.Alt2.D.2.1(a) Mi nut es T999chgB999t r c P999dch# NOTE: Minutes is defined, from the units Battery Data.# Unit Name P= Pod, B= Base station, T= Turtle# Display minutes-30 of running time left.# Status = chg= Charging, trc= Trickle charging, dch= Discharging, off= Switch is OFF. Above displaygives examples of the status left of each minute value. There are 4 possibilities in each battery display.3. Display AdjustScreen2.D.3.1 Di spl ay Adj ustPr es s ENTERThis menu item is used to adjust the brightness and contrast of the screen. Administrator pin is not needed.Screen2.D.3.2 Us e ARROWS t oset br i ght nessAlt2.D.3.2(a) Pr es s ENTER t ocont i nue# Pushing the ENTER key continues to the adjust contrast screen.Screen2.D.3.2 Us e ARROWS t oset br i ght nessAlt2.D.3.2(a) Pr es s ENTER t ocont i nue
- 14 -# Pushing the ENTER key leaves this menu item, and goes back to the Main screen.
- 15 -4. Set Time/DateScreen2.D.4.1 Ti me and Dat ePr es s ENTERThis menu item is used to set the display's internal clock. Administrator pin is not needed.Screen2.D.4.2 HHMMSS 16: 39: 19DDMMYY 09/ 05/ 00Alt2.D.3.2(a) Pr ess ENTER t o cont i nue# The number and arrow keys are used to enter the date and time in the appropriate format.# When ever a digit is changed, the change is written to the internal clock.# Pushing the ENTER key selects that unit, leaves the menu item, and goes back to the Main screen5. View software versionScreen2.D.5.1 Sof t war e Ver s i onPr es s ENTERThis menu item is used to display the software version of all the units. Administrator pin is not needed.Screen2.D.5.2 D=9999 T=9999B=9999 P=9999Alt2.D.5.2(a) Pr es s ENTER t ocont i nue# Versions listed include:D = Display software versionT = Turtle Version softwareB = Base station software versionP = Measurement Pod software Version# Pushing the ENTER key leaves this menu item and goes back to the Main screen.6. Dose CalibrationThis menu item is used to complete dose calibration on a per button basis. Administrator pin is needed.Screen2.D.6.1 Do s e Ca l i b r a t i o nPr es s ENTER
- 16 -1. Press the ENTER key to display Screen 2.D.6.1.2.Screen2.D.6.1.2 Key i n pi n#____then ENTERAlt2.D.6.1.2(a) ←→ mo v e s c u r s o rENTER cont i nues2. After keying in the 4 digit PIN number, press the ENTER key. Screen 2.D.6.2.1will then appear.Screen2.D.6.2.1 Key i n MV or MeV__Xr ay__El ect r onAlt2.D.6.2.1(a) ←→ mo v e s c u r s o rENTER cont i nues# Fill in the beam energy with the last one used during calibration. If a numeric entry starts in the other field,clear the old field. Only one field may contain a numeric entry.3. After entering the beam energy, press the ENTER key. Screen 2.D.6.3.1 will then appear. This screen is usedto enter the serial numbers of the detectors connected to the A, B, C connectors.. If the user wants to edit a serialnumber after entry, this can be done by moving the cursor to the required location and then keying in theappropriate numeric value..Example If a number such as 1376027 is to be replaced with a number 3487, then start at the left cursor positionand enter 0 0 0 3 4 8 7.Screen2.D.6.3.1 A_______B_______C_______ s/ n‘ sAlt2.D.6.3.1(a) ←→ mo v e s c u r s o rENTER cont i nues# Calibration will be performed (i.e., counts integrated and CF calculated) on those channels which have aserial number other than 0 designated in this screen.# Serial numbers will be from 1 to 9999999.# Disallow serial numbers separated by spaces; i.e. '_123_45'.# If no SN is entered, save '_ _ _ _ _ _ _' as 0.# Disallow same serial numbers on multiple channels.# As with all numeric entries, serial numbers are left justified# If all the serial numbers remain blank or are set to blank by entering a 0, then a charge calibration will beperformed on this energy key. With this assignment, current or charge can be displayed. In screen2.D.6.6.1, the unit displayed will be nC. If a value of zero is entered for nC, then the default calibrationvalue will be stored. (Default CF = 0.0025, if 2.5 pC/Cnt)# If intermediate blanks occur in a serial number or if two channels have the same serial number whenENTER is pressed, display Alt 2.D.6.3.1(b) and continue in display 2.D.6.3.1.# The s/n can be cleared entering 0 for all digits.
- 17 -Alt2.D.6.3.1(b) Invalid s/n4. After the serial numbers are entered, screen 2.D.6.4.1 appears. This screen instructs the user to press theenergy key which is to be calibrated.Screen2.D.6.4.1 Pr ess ener gy keyto startAlt2.D.6.4.1(a) Sel ec t k ey f orCALI BRATI ON5. After the energy key has been selected, its corresponding LED turns on and the COUNTING LED turns on.Screen 2.D.6.5.1 will now appear. The measurement pod is now integrating counts and is not in the sleep mode.Screen2.D.6.5.1 A+ B+C+ count sAlt2.D.6.5.1(a) Tur n beam onWhen the beam turns on, do not show the Alt screen. If communication is lost after beam turns on, display theAlt 2.D.6.5.1(b)message:Alt2.D.6.5.1(b) Measur i ng,pl ease wai t# The displayed counts are background compensated just as in a typical dose measurement.# Both negative and positive numbers can be displayed. See equation for calculation in Analysis section ofthe specification.# As in the numeric entry displays, the count displays are left justified to stay close to the channel ID.Maximum number displayed is +999,999 counts, equivalent to about 6000 cGy.# If in the Physics mode the 4th channel counts will replace the word "counts".# A lower case channel letter will be used to let the user know when a bad background was collected. i.e.accelerator was on, or excessive leakage.When the beam turns off, and STOP is pressed show the Alt screen 2.D.6.5.1(c) to allow for reading themeasured counts. When ENTER is pressed, go to Screen 2.D.6.6.1.Alt2.D.6.5.1(c) ENTER t ocont i nue6.The measurement pod will automatically detect when the beam turns off and will make a temperaturemeasurement. User must press STOP in order to terminate the measurement. The Stop command will be sent tothe Pod as well as a temperature request. If the Pod detected a "beam off", then the temperature is available to
- 18 -send to the display. Otherwise, if the radiation intensity was too low to detect a beam on and off condition, thenthe Stop will command a temperature measurement.Note: Do not make another temperature measurement if the beam off was detected because we want thetemperature measurement to be reasonably close to the termination of the beam which closely represents theactual temperature of the diode during the measurement. After Stop is pressed, proceed to screen 2.D.6.6.1.Screen2.D.6.6.1 Key i n dos e0000. 00 cGyAlt2.D.6.6.1(a) ←→ mo v e s c u r s o rENTER cont i nues# Zero fill the dose before displaying. The user can then cursor to the location for editing the number. Typicalentries will be in hundreds of cGy, ex 100.0 cGy# The units defined in the "Dose Unit" MENU item appear in screen 2.D.6.6.1, the example given is cGy.The units can be changed to either cGy, Gy, or Rad in the "Dose Unit" MENU item. If the units arechanged after calibration, the display will compensate with the decimal shift in Gy. (1 Rad = 1 cGy, 1 Gy =100 cGy)7. After the dose value has been keyed in and ENTER pressed, screen 2.D.6.7.1 will appear, displaying thecalculated calibration factors.Screen2.D.6.7.1 A Cf =- 0. 9999999Sn=9999999 99MeVAlt2.D.6.7.1(a) I NC=Sc r ol l ENTER=Sav e STOP=Abor t# Pressing ENTER will save the calibration factors to the measurement pod, leave the calibration menu item,and go back to the Main screen.# Pressing STOP will leave the calibration menu item, and go back to the Main screen without saving thecalibration factors.# Pressing INC will scroll, in a continuous loop, through the factors.# The Calibration Factors will always be less than 1. Always display the sign and leading 0 left of thedecimal and 7 digits right of the decimal. eg. -0.0013136.# The equation for calculating the Calibration Factors is given in the analysis section. Note that the CF can bepositive or negative, depending upon the sign of the measured current.# Pressing PRINT will print a report for this calibration. See the Printouts, Calibration Data section forprintout details.
- 19 -7. Review and print calibrationScreen2.D.7.1 Vi ew Cal i br at i onPr es s ENTERThis menu item is used to display and print the calibration factors for the selected button. Administrator pin isneeded.Screen2.D.7.2 Ener gy k ey t osel ect CalThis screen is used to view the calibration information for the selected buttonScreen2.D.7.3 A Cf =- 0. 9999999Sn=9999999 99MeVAlt2.D.7.3(a) I NC=Sc r ol l ENTER=Mor e STOP=Abor tAlt2.D.7.1(b) To Del et e BUTTONPush bot h Ar r ows# Press the INC key to scroll through the inputs in a continuous circle.# Press the ENTER key to go back to Screen 2.D.7.2 and select another button to review.# To Clear the Button's calibration factors, press both Arrow keys Alt 2.D.7.2(b).# Pressing PRINT will print a report for this calibration. See the Printouts, Calibration Data section forprintout details.# Blink the LED for the energy button being reviewed.Verify that the user wants to clear the calibration factor, that is being reviewed.Screen2.D.7.2 De l e t e Ca l ?ENTER=Y STOP=N# If the ENTER key is pressed, turn OFF the LED for the button being reviewed, clear the calibration, andsave default values to POD button information.# Press the STOP key to go back to Screen 2.D.7.2 and select another button to review.8. Temperature Coefficient CalibrationScreen2.D.8.1 Temper at ur e CoefPr es s ENTER
- 20 -This menu item is used to perform temperature calibration for a detector and input combination. Administratorpin is needed.1. Press ENTER key to display Screen 2.D.8.1.1Screen2.D.8.1.1 Key i n pi n#____then ENTERAlt 2.2: ←→ mo v e s c u r s o rENTER cont i nues2. After entering the password pin #, press the ENTER key. Screen 2.D.8.2.1 will then appear. This screen isused to enter the serial numbers of the detectors which will have their temperature coefficient measured.# The combination of a detector serial number and a connector (A,B,C) must match at least one of thecombinations in the Energy Key calibration table.# The detectors do not need to be the same energy# The detectors do not need to co-exist on the same Energy Key# All detectors can be tested for temperature coefficient in the same beam, as long as the dose per pulse (orinstantaneous dose rate) is nominally within one order of magnitude of their intended beam use.# There are no default s/n’s displayed, the user must key in the numbers.# If the user wants to change a serial number, this can be done by moving the cursor to the required locationand then keying in the appropriate numeric value.Example: Let the following table represent a calibration of the Energy keys, with the detector serial numberslocated in the connector columns A, B, C.Energy Key Calibration A B C1 6 MV, 100 cm SSD 126 - -2 18 MV, 100 cm SSD - 188 -3 Electron, 100 cm SSD - - 2314 6MV, wedge, 100 cm SSD 126 - -5 6MV TBI, 300 cm SSD 126 127 1286 Electron, Whole Body, 400 cm SSD 223 229 2317 Electron Cutout, 100 cm SSD 23189101112The first selection of serial numbers for temperature coefficient testing will be: 126, 188, 231.A=126, B=188, C=231, and the Energy Key assignments will be 1, 2, 3, 4, and 7. Note that s/n 126 occurs onkeys 1 and 4 (and no others in this group), s/n 188 occurs on key 2 (and no others…), and 231 occurs on keys 3and 7 (and no others…). This group of energy keys all have the same nominal dose rate. Therefore, thetemperature coefficient (tc), for a given detector, will be about the same in any of the five radiation fieldsassociated with these keys. The tc will not necessarily be equal among detectors.The second selection of serial numbers for tc testing will be: 126, 127, 128.A=126, B=127, C=128, and the Energy Key assignments will be 5 only. Here, the dose rate for Detector 126 at300 cm is significantly different than in Energy Key one, so its tc may be different.Likewise, the third selection of serial numbers for tc testing will be: 223, 229, 231.A=223, B=229, C=231, and the Energy Key assignments will be 6 only
- 21 -In most clinical applications, we will only need to perform one tc test because most facilities perform IVD at ornear isocenter (SSD 100 cm) on any of their beams.Screen2.D.8.2.1 A_______B_______C_______ s/ n‘ sAlt2.D.8.2.1(a) ←→ mo v e s c u r s o rENTER cont i nues3. After the serial numbers are entered, screen 2.D.8.3.1 appears. This screen instructs the user to press theenergy keys for which the temperature coefficients will be measured and then assigned to.Screen2.D.8.3.1 Sel ect Ener gyKey s , t hen ENTERAlt2.D.8.3.1(a) Assi gns t mp coeft o keys4. After the ENTER key has been selected, the corresponding Energy Keys’ LED turn on and the COUNTINGLED turns on. Screen 2.D.8.4.1 will now appear. The measurement pod is now making temperaturemeasurements once a second, updating counters, and is not in the sleep mode. The display requests atemperature on every update and displays the value in alternate screen Alt 2.D.8.4.1(a).Screen2.D.8.4.1 Si t det ect or s onwar m bui l dupAlt2.D.8.4.1(a) A=99. 9 B=99. 9C=99. 9 deg Cel5. When any of the detectors’ temperature increases 1.0 degree C above the first value measured in step 4, resetthe counters and display the message in Screen 2.D.8.5.1.Screen2.D.8.5.1 Del i ver 100 MUDo s e 1Alt2.D.8.5.1(a) Measur i ng,pl ease wai tStop making temperature measurements. When "beam on" is detected, accumulate the counts from the pod inthe same manner as a dosimetry measurement. When beam off occurs, make a temperature measurement. Savethis temperature measurement as T 1 and the total count measurement as C 1.6. Display Screen 2.D.8.6.1. Make a background measurement for 15 seconds. Save as B 1. Start makingtemperature measurements once a second again.
- 22 -Screen2.D.8.6.1 Al l ow Temp Dr i f tPl eas e Wai tAlt2.D.8.6.1(a) A=99. 9 B=99. 9C=99. 9 deg Cel7. After all of the detectors’ temperature increases at least 2.0 degree C above T 1 measured in Screen 2.D.8.5.1,reset the counters and display the message in Screen 2.D.8.7.1. Stop making temperature measurements.Screen2.D.8.7.1 Del i ver 100 MUDo s e 2Alt2.D.8.7.1(a) Measur i ng,pl ease wai tWhen "beam on" is detected, accumulate the counts from the pod in the same manner as a dosimetrymeasurement. When beam off occurs, make a temperature measurement. Save this temperature measurement asT 2 and the total count measurement as C 2.8. Display Screen 2.D.8.8.1. Make a background measurement for 15 seconds. Save as B 2. Start makingtemperature measurements once again.While making temperature measurements, calculate the temperature coefficient "tc" on all the measureddetectors:()()()()( )()( )cnrbtnCAL1cnr22cnrbtnCAL2cnr11cnr11cnr222cnrbtn TTBCTTBCBCBCtc,,,−⋅−−−⋅−−−−=where TCAL is the temperature stored in the selected button file for the corresponding detector s/n.Note: (tcbtn,cnr)2 must be calculated for each selected button file because TCA L can be different for each button.Screen2.D.8.8.1 Al l ow Temp Dr i f tPl eas e Wai tAlt2.D.8.8.1(a) A=99. 9 B=99. 9C=99. 9 deg CelThere is now a temperature coefficient which can be either saved or re-measured. At this point in the procedure,the user should be given the choice save and exit (ENTER), or not save and exit (STOP). Display alternatescreen 2.D.8.8.1(b) while temperature drift occurs. Note that display sequence is: 8.1, 8.1(a), 8.1, 8.1(b), 8.1,8.1(a), 8.1, 8.1(b), etc.Screen2.D.8.8.1(b) ENTER=Sav e&Ex i tSTOP =Abor t &Ex i t
- 23 -9. After all of the detectors’ temperature increases at least 2.0 degree C above T2 measured in Screen 2.D.8.7.1,reset the counters and display the message in Screen 2.D.8.9.1. Stop making temperature measurements.Screen2.D.8.9.1 Del i ver 100 MUDo s e 3Alt2.D.8.9.1(a) Measur i ng,pl ease wai tWhen "beam on" is detected, accumulate the counts from the pod in the same manner as a dosimetrymeasurement. When beam off occurs, make a temperature measurement. Save this temperature measurement asT3 and the total count measurement as C3.10. Display Screen 2.D.8.10.1. Make a background measurement for 15 seconds.Screen2.D.8.10.1 Me a s u r i n gBACKGROUNDAlt2.D.8.10.1(a) Pl eas e wai tSave as B3.Calculate the temperature coefficient "tc" on all the measured detectors:()()()()( )()( )cnrbtnCAL1cnr33cnrbtnCAL3cnr11cnr11cnr333cnrbtn TTBCTTBCBCBCtc,,,−⋅−−−⋅−−−−=where TCAL is the temperature stored in the selected button file for the corresponding detector s/n.11. If tc2 – tc3 is within ± 0.0005, screen 2.D.8.11.1will appear, displaying the calculated temperaturecalibration factors. Otherwise repeat steps 8 thru 10This screen is used to view the temperature calibration informationScreen2.D.8.11.1 A t c=- 0. 9999999B t c=- 0. 9999999Alt2.D.8.11.2(a) I NC=Sc r ol l ENTER=Sav e STOP=Abor t# Press the INC key to scroll through the inputs in a continuous circle.# If more than one button file for a S/N, display the last button tc calculation.# Pressing ENTER will save the temperature calibration factors to the measurement pod and exit thecalibration function.# Pressing STOP will exit the calibration function without saving the calibration factors.# The default tc in the calibration file is 0.0. If STOP is pressed, do not change the value in the calibrationfile, i.e. If a prior tc was measured and saved, leave it.
- 24 -9. Select Dose UnitsScreen2.D.9.1 Do s e Un i tPr es s ENTERThis menu item is used to select the dose units that are displayed and printed. Administrator pin is needed.Screen2.D.9.2 ARROWS t o sel ectdose uni t cGyAlt2.D.9.2(a) ENTER= Conf i r mSTOP = Abor t# Use the arrow keys to cycle through the list of units. The units are cGy, Gy, Rads.# Pushing the ENTER key selects that unit, leaves the menu item, and goes back to the Main screen.# Pushing the STOP key leaves this menu item, and goes back to the Main screen.10. Set device IDScreen2.D.10.1 De v i c e I D Ed i tPr es s ENTERThis menu item is used to change the Identification cod (ID) of a pod. Administrator pin is needed.Screen2.D.10.2 Us e ARROWS o r #t o change I D: 99Alt2.D.10.2(a) ENTER= Conf i r mSTOP = Abor t# Use the arrow keys to increment or decrement the ID number.# Also allow the use of the number keys to enter the ID.# The ID is a number from 02-15.# Pushing the ENTER key selects that ID, leaves the menu item, and goes back to the Main screen.# Pushing the STOP key leaves this menu item, and goes back to the Main screen.# The ID that is displayed will be the current ID.# The ID will only get set on a pod that is hard wired by itself. There will be no base station to go through,and no wireless pod IDs set.
- 25 -11. Toggle Physics mode on and offScreen2.D.11.1 Physi cs ModePr es s ENTERThis menu item is used to set the unit into Physics mode. Physics mode is used to override the checks for themeasurement pod being connected to line power. This is used if the battery is low and the pod can be pluggedin, but won't be used on patients. Example: Calibration, or after hours checks. Administrator pin is needed.Screen2.D.11.2 ENTER= Mode ONSTOP = Mo d e OFF# Pushing the ENTER key turns ON physics mode, saves the selection, leaves the menu item, and goes backto the Main screen.# Pushing the STOP key turns OFF physics mode, saves the selection, leaves the menu item, and goes backto the Main screen.# Auto exit Physics mode after either power cycle or 1 hour of inactivity. Inactivity is defined as not activelyacquiring and no key press.# When physics mode is active, put a 'p' in the lower right hand corner of the dose display.12. Enter or Change PinScreen2.D.12.1 PI N Set upPr es s ENTERThis menu item is used to setup a PIN (Personal Identification Number). Administrator pin is needed.Screen2.D.12.2 Us e Nu mb e r s t oChange PI N=9999Alt2.D.12.2(a) ENTER= Conf i r mSTOP = Abor t# Use the number keys to enter a 4 digit PIN.# The uninitialized value is all 0's and is invalid for a PIN.# All 4 digits must be used.# Pushing the ENTER key goes to screen 2.D.11.3 for confirmation.# Pushing the STOP key leaves this menu item, and goes back to the Main screen.# If no PIN exists, then "0000" can be entered.# Get password is "0911" entered at the screen to enter "PIN Setup"This menu item is used to confirm the entered pin.Screen2.D.11.3 Con f i r m PI NPI N=9999
- 26 -# Use the number keys to enter the 4 digit PIN again.# When the last digit is entered, and the 4 digits match the first entry do the following:1. Leave the menu item.2. Return to the Main screen.# When the last digit is entered, and there is no match, go back to Screen 2.D.12.2# Pushing the STOP key leaves this menu item, and goes back to the Main screen.13. System SetupScreen2.D.13.1 Sys t em Set upPr es s ENTERThis menu item is used to associate the present configuration with a configuration number to identify it. Theconfiguration is used to ensure that all the correct pieces are connected and communicating.Screen2.D.13.2 T#99 B#99 P#99Sav e Sy s t em as 9Alt2.D.13.2(a) ENTER= Conf i r mSTOP = Abor t# There can be from 1 to 9 systems, numbered 01 through 9.# A basic system is defined as a Turtle with ID 01, a measurement pod with a unique id from 02 to 15. If awireless system is being used, then a Base station with a unique id from 02 to 15 is also required.# Use the number keys to enter a system number.# Pushing the ENTER key saves the system number, leaves the menu item, and goes back to the Main screen.# Pushing the STOP key leaves this menu item, and goes back to the Main screen.14. View software versionScreen2.D.14.1 Software versionPr es s ENTERThis menu item is used to display the software version of all the units.Screen2.D.14.2 D=9999 T=9999B=9999 P=9999Alt2.D.14.2(a) Pr es s ENTER t ocont i nueD = Display software versionT = Turtle software versionB = Base station software versionP = Measurement Pod software version
- 27 -E. Maintenance1. Detector POD/Base StationBattery Charging and ReplacementThe internal rechargeable NiMH battery should be able to run 12 hour on full charge. It is a good practice, when not using theDetector Pod, to keep the DC power converter plugged into the Detector Pod's DC power jack. Battery Switch (0=OFF,1=ON) must be on in order to charge the battery. It is not necessary to discharge the batteries. There is special batterycharging software that optimizes the battery charging status particularly to the battery installed in the Detector Pod.Note that it is also possible to charge the Detector Pod battery by connecting the proper cable between J6 of the Base StationJ5 of the Detector Pod, assuming that the Base Station is connected to the Turtle and the Turtle DC power jack is connectedto the DC OUT jack on the Display Module panel.If it becomes necessary to change the battery in the Detector Module, perform the following steps:1. Switch the battery switch off. (BAT in the 0 position)2. Remove the Phillips head screw from the underside of the Detector Pod.3. On the battery switch end panel, remove the 2 Phillips head screws, next to the DS3 and DS4 indicators.4. Orient the Detector Module on the bench with the antenna point up.5. Gently pull on the end panel bezel and pull the pc board assembly about half way out. The battery board assembly willbe visible. It rides in the top track of the case.6. The battery board can now be lifted out, and remove the battery connector from the main pc board.7. Connect the new battery connector and position the pc board into the top track of the case.8. Slide the assembly back into the case by pushing on the end panel bezel.9. Replace the two end panel screws and the bottom screw. Do not over tighten the end panel screws.10. Plug the DC power converter into the Detector Pod's DC power jack and switch the BAT to 1 on the end panel.11. Charge the battery for 24 hours. It is now ready for use.IndicatorsThere are four LEDs on the end panels that indicate the status of the Detector PodDS1: This is the battery charge status.• Off during battery discharge, i.e., not connected to power source. This is normal during measurements.• Rapid blink during low battery status• On steady during trickle charge of the battery• Slow blink (once per second) during active charging other than trickle chargeDS2: There 4 possible states• Rapid flashing indicates an error occurred during operation. Such errors can be caused by a bad communication,internal memory error, battery maintenance error, etc.• On/Off every other second while not on battery indicates normal operation• On/Off every other second while on battery indicates active acquisition• One quick flash every second indicates sleep mode during battery operationDS3: On when transmittingDS4: On when receiving2. TurtleBattery Charging and ReplacementThe Turtle also has internal rechargeable NiMH battery. Normal operation using rf communication will not require thebattery, the power for the Turtle can be taken from the Display Module by connecting a barrel connector jumper between theTurtle DC input jack and the OUT DC connector jack on the Display Module.If the rf communication is not used and the Detector Pod is connected directly to the Turtle, then the battery in the Turtle isrequired for dosimetry measurements. In this case, the barrel connector jumper should not be connected between the TurtleDC input jack and the OUT DC connector jack on the Display Module. The Turtle battery should be able to run 12 hour onfull charge.
- 28 -It is a good practice, when not making dosimetry measurements, to charge the battery with the barrel connector jumperconnected between the Turtle DC input jack and the OUT DC connector jack on the Display Module. Battery Switch(0=OFF, 1=ON) must be on in order to charge the battery. If measurements are attempted in this configuration, they willnot be allowed and the Display will indicate a message "Charging Battery, Do Not Measure".If it becomes necessary to change the battery in the Detector Module, perform the steps outlined under the Detector Podinstructions for changing the battery.IndicatorsThere are four LEDs on the end panels that indicate the status of the Detector PodTX: Green LED – Data TransmitEN: Green LED – Enable StatusRX: Green LED – Data ReceiveDS1: Green LED – On during 10 second Download wait ("Initializing, Please Wait" display message)DS2: Green LED – On when running code during normal operation, 1 flash ervery other second during batteryoperationDS3: Green LED – Rapid flash when error occurrsDS4: This is the battery charge status.• Off during battery discharge, i.e., not connected to power source. This is normal during measurements.• Rapid blink during low battery status• On steady during trickle charge of the battery• Slow blink (once per second) during active charging other than trickle charge
- 29 -3. PrintoutsA. GeneralShow message ( for 2 seconds) after the PRINT button is pushedScreen 3.A.1 Printing...Printer should be set to 40 columns.B. Report Layouts1. Intermediate Dose ReportAn Intermediate dose report is printed by pressing the PRINT key while the Active LED is turned on. It givesprovides an opportunity to print a one or more treatment fields before STOP is pressed. Each intermediatedose report will contain the accumulated total since the energy key is pressed.**************************************** RF-IVD INTERMEDIATE DOSE REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00Patient Name:___________________________Patient ID:_____________________________Field:______________ Machine:___________Energy:________ MU:________ SSD:________POD 04, S/N 9999999 Key: 1 Energy:06 MeVDOSE:Channel A= 150.0 cGy (s/n: 1615126)Channel B= -0.0 cGy (s/n: 1615125)Channel C= 106.6 cGy (s/n: 1615124)Therapist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on Intermediate dose report will be the date and time of the printout.# Print this report when collecting Dose with calibrated inputs.
- 30 -2. Dose ReportAfter STOP is pressed, this report is printed when PRINT is selected.**************************************** RF-IVD DOSE REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00Patient Name:___________________________Patient ID:_____________________________Field:______________ Machine:___________Energy:________ MU:________ SSD:________POD 04, S/N 9999999 Key: 1 Energy:06 MeVDOSE:Channel A= 150.0 cGy (s/n: 1615126)Channel B= -0.0 cGy (s/n: 1615125)Channel C= 106.6 cGy (s/n: 1615124)Therapist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on the Dose report will be the STOP date and time of the acquisition.# Print this report after collecting Dose with calibrated inputs.3. Intermediate Charge Report**************************************** RF-IVD INTERMEDIATE CHARGE REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00POD 04, S/N 9999999 Key: 1DOSE:Channel A= 45.7 nCChannel B= 72.4 nCChannel C= 18.4 nCTherapist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on the Intermediate Charge report will be the date and time of the printout.# Print this report while collecting charge with un-calibrated inputs.
- 31 -4. Charge Report**************************************** RF-IVD CHARGE REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00POD 04, S/N 9999999 Key: 1DOSE:Channel A= 45.7 nCChannel B= 72.4 nCChannel C= 18.4 nCTherapist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on the Charge report will be the end date and time of the acquisition.# Print this report after collecting charge with uncalibrated inputs.5. Dose Calibration Report**************************************** RF-IVD DOSE CALIBRATION REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00POD 04, S/N 9999999 Key: 1 Energy:06 MeVDOSE:Channel A= -0021892 Cts (s/n: 1615126)Channel B= -0022169 Cts (s/n: 1615125)Channel C= -0021944 Cts (s/n: 1615124)CALIBRATION FACTORS: TEMPERATURE:Channel A= -0.004567 99.9 Deg CChannel B= -0.004510 99.9 Deg CChannel C= -0.004557 99.9 Deg CTEMPERATURE COEFFICIENTS:Channel A= 0.0Channel B= 0.0Channel C= 0.0Physicist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on the Dose Calibration report will be the Date and time of Calibration..# Only show temperature, if the Calibration Factor is negative.# Show 0.0 for temperature coefficients if not done yet.# Print this report when the calibration coefficients are displayed in dose calibration (Screen 2.D.6.7.1) orfrom View Calibration with a button selected (Screen 2.D.7.3 ).
- 32 -6. Charge Calibration Report**************************************** RF-IVD CHARGE CALIBRATION REPORT****************************************HHMMSS: 08:52:38 DDMMYY: 20/09/00POD 04, S/N 9999999 Key: 1 Energy:06 MeVDOSE:Channel A= 0021892 Cts (s/n: 1615126)Channel B= 0022169 Cts (s/n: 1615125)Channel C= 0021944 Cts (s/n: 1615124)CALIBRATION FACTORS:Channel A= -0.004567Channel B= -0.004510Channel C= -0.004557TEMPERATURE COEFFICIENTS:Channel A= 0.0Channel B= 0.0Channel C= 0.0Physicist:_____________________________Software Versions:D:999999 T:999999 B:999999 P: 999999****************************************# The date and time on the Charge Calibration report will be the Date and time of Calibration..# Print this report when the calibration coefficients are displayed in charge calibration (Screen 2.D.6.7.1)or from View Calibration with an uncalibrated button selected (Screen 2.D.7.3 ).4. CalculationsA. BackgroundDisplay builds a FIFO array with the counter data from the POD and a time value (in seconds) fromthe 16 milli-second clock on the pod. This array is cleared each time an energy key or Stop ispressed.The array looks like:A(1,1)=T(1), A(1,2)=A(1), A(1,3)=B(1), A(1,4)=C(1), A(1,5)=D(1);A(2,1)=T(2), A(2,2)=A(2), A(2,3)=B(2), A(2,4)=C(2), A(2,5)=D(2);…;A(32,1)=T(32), A(32,2)=A(32), A(32,3)=B(32), A(32,4)=C(32), A(32,5)=D(32).T(n) = time stamp of the nth counter values for channels A, B, C, D. with T(1) being the most recentand T(32) being the oldest.When a calibrated energy key is pressed, calculate the background rates before clearing the array.Caution: Note conditions below.Find first subscript n such that A(n,1) – A(1,1) > 30, i.e., calculate the background from the mostrecent 30 seconds of data.
- 33 -1,11,4,14,1,11,3,13,1,11,2,12,AAAABKGCAAAABKGBAAAABKGAnnnnnn−−=−−=−−=where BKGA, BKGB, BKGC are the background counting rates for channels A, B, C.Background calculation conditions:# Recalculate BKGA, BKGB, BKGC after an energy key is pressed only if A(1,1)-A(oldest,1)>=30.i.e. we have collected a full 30 seconds worth of background again, otherwise use the priorvalues of BKGA, BKGB, BKGC previous to the energy key being pressed.# If new BKGA, BKGB, or BKGC is < 10 (25 pA), replace previous value with the new value.# If new BKGA, BKGB, or BKGC is >= 10, replace previous value with 0. Display '~' next to thedose results in the Dose screen, and display lower case a, b, c, when displaying charge results.# Example: Old BKGA = 3.53, BKGB = 2.88, BKGC = 4.34a) A(30,1) – A(1,1) = 30, 1st condition passes, calculate new backgroundsb) New BKGA = 4.39, BKGB = 2.58, BKGC = 11.34c) Replace backgrounds as BKGA = 4.39, BKGB = 2.58, BKGC = 0d) Something failed in channel C, but A and B are OK.# Example: Old BKGA = 3.53, BKGB = 2.88, BKGC = 4.34a) A(21,1) – A(1,1) = 21, 1st condition fails, do not calculate new backgrounds# Note that it is possible, if we miss a communication, that the A(n,1) – A(1,1) > n.B. Irradiating the PodIf Pod Rate is above 80 counts/second, then in both Measure mode and Non-measure mode (background), thedisplay should give an audible and visual warning. This level should be adjustable by the Physicist. Adjust asfollows:During warning, while in Physics mode, press "$to auto set new warning threshold to the current PodRate* 1.2. This method would be used if rate is being set while pod is in typical clinical scatter conditions.ORDuring warning, while in Physics mode, press !$to set the warning threshold to current Pod Rate/2. Thismethod would be used if setting the threshold by irradiating the pod under minimum direct beam conditions.1,11,25,15,2AAAAPodRate −−=C. Data collectionAt the beginning of the measurement, when the pod is told to start measuring, the 16 milli-second counter iszeroed. During Measurement, calculate the Dose and Rate from the FIFO array as follows:Dose:[]()[]()[]()CbtnCbtn1141BbtnBbtn1131AbtnAbtn1121cfTempCFBKGCAADCcfTempCFBKGBAADBcfTempCFBKGAAADA,,,,,,,,,,,,⋅⋅⋅−=⋅⋅⋅−=⋅⋅⋅−=where DA, DB, DC are the dose values for channels A, B, C and CFbtn,A, CFbtn,B, CFbtn,C, are theCalibration Factors for channels A, B, C on energy button 'btn'. (Tempcf)btn,cnr is defined below, cnrbeing A, B, or C. This assumes that the timer counter was zeroed, i.e., A1,1 is the true elapsed timesince pressing the energy key.
- 34 -Rate:()()[]()()()[]()()()[]()CbtnCbtn12114241BbtnBbtn12113231AbtnAbtn12112221cfTempCFBKGCAAAARCcfTempCFBKGBAAAARBcfTempCFBKGAAAAARA,,,,,,,,,,,,,,,,,,⋅⋅⋅−−−=⋅⋅⋅−−−=⋅⋅⋅−−−=where the RA, RB, RC are the dose rate values for channels A, B, C during the past time interval ofA1,1 to A2,1.D. Computing Temperature Correction factorThe temperature correction factor is computed from:()[]1cnrbtncnrcnrbtncnrbtn TCALTMPtc1Tempcf −−⋅+= ,,,where:tcbtn,cnr = Temperature Coefficient of the detector on connector 'cnr' when the calibration of energybutton btn was performed. The temperature coefficient is not measured at the time of calibration ofthe energy button. It measured during a temperature coefficient procedure.TMPcnr = Measured temperature of the detector, which first occurs at the Start of the measurement,but is then replaced with the value when the beam turns off.TCALbtn,cnr = The measured temperature of the detector when the detector was calibrated on the cnrconnector to the btn energy button.E. Computing Dose Calibration factor for energy button 'btn'Calculate CF is a follows:[][][]BKGCAADCCFBKGBAADBCFBKGAAADACF1141Cbtn1131Bbtn1121Abtn⋅−=⋅−=⋅−=,,,,,,,,,DA, DB, DC are all equal since they are all the same dose, entered by the user after the calibrationbeam turns off.There is no temperature correction because the calibration is at the temperature during calibration.That is, in the expression for Tempcf, the difference TMPcnr - TCALbtn,cnr during calibration is zeroand TCALbtn,cnr gets saved with the calibration.

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