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INTRODUCTION
This manual is part of Front End Calibration Manual 490-3031-05. It describes a complete FEE
calibration procedure, which is required when a new FEE subsystem with a new detector is first
integrated into the system.

PREREQUISITE
The service engineer should be familiar with the following subjects before starting the procedure:

1. FEE block diagram.

2. System Tables: DMODEL, SMODEL, SYSPARM.

3. FEE setting tables : CONTROL ,EVENT, FCAL, FEI, FES1, FES2, GSET, NFCAL,
NSCAL, NSSET, PORT, SCAL, SIMULATORS, SOR, SRR, SSET, WINDOWS.

4. FEE calibration function with simulators : AUTOCAL, EGE, GAIN, GIX, GIY, GIZE,
GIZN, INX, INY, INZE, INZS, PMGO, NULX, NULY, NULXE, NULYE, OUTX,
OUTY, OUTZE, OUTZN, PMGO, POSX, POSY, SGE, ZOFFSET.

5. FEE calibration function with radioactive source: EGR, ITERCAL, PMGR, SGR.

6. FEE diagnostic function : MCA (FWHM measurement), AV, ADC, HAND, TPMGO.

7. Service function and presets: EX109, USER.

8. System function : STATIC acquisition, ROI operation, HISTOGRAM and MARKER

operation, INSTALL, UNINSTALL.

EQUIPMENT REQUIRED
The following equipment is required for the complete calibration procedure:
1. Scope - HP-1740 with two probes (or equivalent).
2. DVM.
3. Radioactive source - Tc99M (Co57), Ba133 (I131), Am241 (Tl201).
4. Polaroid camera.
5. Master key diskette (V3.05 and up).

ABOUT THE DOCUMENT

1. All the procedures should be carried out in sequence order.
2. Bold command lines are for execution.
3. Bold numbers are adjustment values or calibration limits.

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 1 JANUARY 1995
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SP4, SP-4HR, SP-4M, SP-6 CALIBRATION FLOW CHART

10 CALIBRATION of the
1 BOARDS SETUP OFFSETS and GAINS using 20 CALIBRATION of the
ELECTRONIC SIMULATOR LED DRIVER

11 CALIBRATION 21 CALCULATION
2 TEST OF THE of the H.V. of the PMs OPTICAL
POWER SUPPLY REFERENCE

12 FIRST CALIBRATION of
3 SETTING SECURITY LEVEL ZENR and SCA CHANNEL 22 TEST of the OPTICAL
and MODEL DEFINITION using RADIOACTIVE SOURCE SYSTEM OPERATION

4 INITIALIZATION OF 13 FIRST TEST of SCA and 23 TEST of the OPTIC

THE H.V. Z ENERGY WINDOWS SYSTEM DYNAMIC
MATCHING RANGE

5 TEST of the PMs and ANALOG 14 TEST of the ZENR and 24 CALIBRATION of the
COMPUTER OFFSETS and ZNRM NOISE DENOMINATOR
BIAS ADJUST OFFSET and NULLING

6 INITIALIZATION of the 15 CALIBRATION of the 25 FINAL CALIBRATION

LED DRIVER IMAGE SIZE and CENTER of the IMAGE SIZE
and CENTER

16 ROUGH CALIBRATION
7 TEST of the OPTIC SIGNALS of the PMs 26 FINAL ITERATIVE
CALIBRATION

8 TEST of the ELECTRONIC 17 TEST of ZNRM DYNAMIC 27 FINAL CALCULATION

SIGNALS RAGE using a of PMs OPTICAL
RADIOACTIVE SOURCE REFERENCE

9 TEST of the RADIOACTIVE 18 SECOND CALIBRATION 28 FINAL TESTS - SYSTEM

SIGNALS of SCA and ZENR VERIFICATION as a
PREREQUISITE for MAPS

19 TEST of SCA and Z ENERGY 29 BACKUP the FRONT END

WINDOWS MATCHING PARAMETERS

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1. BOARDS SETUP

Check jumpers set up in the following cards (see cards layout):

1.1 PMG CARD

Verify that for systems equipped with Hamamatsu or Phillips PMs:

R211 is 1K MF and RSPARE (U3D/10,11) is 1.69K MF.

For systems equipped with RCA PMs swap R211 with RSPARE:
R211 is 1.69K MF and RSPARE 1K MF.

R211 limits the maximum HV :1500V for Hamamatsu or Phillips, and 1200v for RCA.

1.2 ANALOG CHANNEL CARD

Verify that the 3 jumpers of the Delay Lines are located 3 tapes from the top.

1.3 ADC CARD

For all SP models :

Verify that jumpers J10/2-3, J11/2-3 and J12/2-3 are CONNECTED.

For all 4xx models :

Verify that jumpers J10/1-2, J11/1-2 and J12/1-2 are CONNECTED.

1.4 CONTROL CARD

a. Timing delay of electronic and optic simulators:

• SP 4, 6, 4HR, 4M and 609 with nominal 15M data cable:

Verify that jumpers ES/1-2, OS/1-2 are REMOVED.

• 609 with 10M data cable: Verify that jumpers ES/1-2 , OS/1-2 are
CONNECTED.

• SP-4M: Verify that jumpers G12/1-2, G12/4-5 are CONNECTED.

b. Optic simulator intensity dynamic range:

For all models, verify that the following resistors are updated:
R11=1K, R800=5.62K, R801=2.2K.

1.5 MOTHERBOARD

Verify connection of 4 coax (+X, +Y) to J205, see labels on the coax.
SP4, SP4HR are connected in the same way, (both are truncated heads).
SP6, SP4M are connected differently.

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FRONT END CALIBRATIONS 3 JANUARY 1995
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2. TEST OF THE POWER SUPPLY

Check the POWER SUPPLY voltage, tolerance, and ripple :

2.1 FLOOR CABINET

Remove the FLOOR CABINET side cover (motherboard side), Switch ON the system and check
the DC voltages on the motherboard as follows:

MOTHERBOARD BARS 5 V/120 A : 5.0 - 5.1 V; RIPPLE :100 mV

MOTHERBOARD J230 +12V : 11.9 -12.1 V; RIPPLE :60 mV

MOTHERBOARD J230 +15V : 14.9 -15.1 V; RIPPLE :40 mV

MOTHERBOARD J230 -15V : 14.9 -15.1 V; RIPPLE :40 mV

Motherboard J230

3 2 1

-15 V
+15 V
+12 V RTN 15 V RTN
+ 5 V S RTN +12 V
+5VS
15 14 13

2.2 DETECTOR

Remove head cover and disassemble the lead plates. Check the DC voltage supplied to the
ANALOG COMPUTER CARD (see ANALOG COMPUTER layout):

+ VDC : 9.75 V - 10.75 V

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

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3. SETTING SECURITY LEVEL AND MODEL DEFINITION

To avoid unauthorized tampering with the system, all calibrations can be performed only under
Service Security Level. This level is higher than the Security Level of the operator.
To change the security level perform the following:

1. Type BC4Z4 <CR>.

2. Type XXXXX.

a. In V3.05 and up:

The system asks for Master diskette. Insert the diskette and press <CR>.
The system asks for your name, enter the name XX <CR>, (example: I.V. <CR>).

b. In V2.31 and below:

The system will enter service mode without key diskette.

NOTE: Any RESET of the system will require entering the code again.

3. Type SYS <CR> ,update the system specification:

DATETYPE: 1 <CR> for European.
0 <CR> for American.
Verify that: FEE SET UP: 1 , ON LINE CALIBRATION: 1.

4. Type SMODEL <CR>,

Update SYSTEM TYPE as follows:
For software version below 4.0:
409 <CR> for SP-4, SP-4HR, SP-4M
609 <CR> for SP-6

For software version 4.0 and up:

4 <CR> for SP-4
4HR <CR> for SP-4HR
4M <CR> for SP-4M
6 <CR> for SP-6

Update SYSTEM OPTIONS as follows:

a. Below V3.05:
Insert in MODEL OPTIONS: F for FEE
J for no D TERM

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b. V3.05 and up:
Exit SMODEL: <ESC>,
Insert F in SMODEL to enable the FEE by typing under main menu:
INSTALL F <CR>.

Remove J letter from SMODEL by typing:

UNINSTALL J <CR>.
This is required when the system is equipped with new BSE and CORRECTOR
cards which were used in ASFI option, the new option works with the D term during
linearity map correction.

5. Type DMODEL <CR>, set the panel to the following values:

Enter code for DETECTOR MODEL, as follows:

0 <CR> for SP-4 (37 PMs)
1 <CR> for SP-6 (59 PMs)
2 <CR> for SP-4HR (61 PMs)
3 <CR> for SP 4M (37 PMs)

INITIALIZE FE-PARAMS (Y/N)?: Y <CR> setting SS, SCAL and FCAL to 2048
(SS for SP-4HR to 2600)
TYPE OF PHOTO-MULTIPLIERS: 0 <CR> for HAMAMATSU
1 <CR> for RCA
2 <CR> for PHILIPS

NOTE:
During the calibration procedure, whenever a new reference number is generated in the
FEE tables, back up the user diskette:

Insert the USER BACKUP diskette into the floppy drive and type: USER 1 <CR>,
confirm Y <CR>.

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 6 JANUARY 1995
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4. INITIALIZATION OF THE HV

To initialize the High Voltage perform the following:

1. Switch OFF the power supply and shut down the circuit breaker. Open the floor cabinet
side cover (crate side), disconnect the HV power supply output cable and connect to it in
serial an attenuation box.
Switch ON the circuit breaker and the main switch.

CAUTION
Do not disconnect or connect the HV output cable when the HV power
supply is on; it may damage the PMs.

2. Connect DVM to the attenuation box output.

3. Type PORT <CR>, set the panel as follows:

PORT : 0382 <CR> , the HV port in the PMG CARD
For Version 3 and up you can type: PORT : HV <CR>.
Change DEC- VAL: XXXX <CR> , by steps of 10 channels until the DVM
shows:
-1,080 V for HAMAMATSU and PHILIPS tubes
- 950 V for RCA tubes.

Write down the PORT DEC VALUE in your notebook.

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 7 JANUARY 1995
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5. TEST OF THE PMS AND ANALOG COMPUTER OFFSETS AND BIAS
ADJUST

The following procedure checks the DC BIAS to each of the PM channels and verifies that the
summing offsets are below a specified value.

1. Remove the head covers. Verify that all the PM plastic sleeves are in place.
Unconnected sleeves can cause light penetration which will effect your measurement.

2. Turn off all PMs by typing : FEI <CR>.

3. Check that the input and the output DC offset of each of the PM channels are as follows:

a. Connect DVM, DC, scale-200 mV to ANALOG COMPUTER card.

b. Check the INPUT TP and OUTPUT TP of each PM channel: verify that the offset is
within ±1 mV.
Any deviation from this range indicates channel malfunction, and the appropriate
channel must be repaired.
c. Write down the INPUT TP offset for each of the channels, for future verification.

4. Connect DVM, DC, 200 mV scale, to the ANALOG COMPUTER card, BIAS TP.

5. Adjust the BIAS potentiometer RV2 to : -2.5 mV DC.

6. Check the output DC OFFSET of each of the summing amplifiers measured at

OUTPUT TP:
Znrm summings : < + 50 mV
Zenr summings : < + 100 mV
+X summings : < + 50 mV
+Y summings : < + 50 mV

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 8 JANUARY 1995
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6. INITIALIZATION OF THE LED DRIVER

The following procedure adjusts the LED DRIVER intensity via the PIN DIODE channel.

1. Setting the pin diode and the LED intensity:

a. Type SIM <CR>.

OPTIC: 1 <CR>
INTENSITY: 2048 <CR>, <ESC>.

b. Type SS <CR>,
P.D: 1 <CR>, <ESC>.

2. Adjusting the LED output:

a. Open the head covers and connect the scope to ZENR TP OUT in the analog
computer.
Scope setup: DC, 0.5 V/div , 0.2 micros/div.

b. Adjust the potentiometer RV1 in the LED DRIVER PCB to get an amplitude of
1.2 V in the ZENR signal.

c. Close the P.D. and verify that the ZENR TP OUT is set to 0V.
Type SS <CR>,
P.D : 0 <CR> , <ESC>.

This is only a rough calibration, The fine calibration will be performed at a later stage.

Figure 6-1. ZENER TP OUT

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FRONT END CALIBRATIONS 9 JANUARY 1995
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7. TEST OF THE OPTIC SIGNALS

The following procedure checks the function of the optical system and the PM BIAS channel on
the ANALOG COMPUTER :

1. Set the optic simulator and PM BIAS channel # 1:

a. FEI <CR>.

b. SIM <CR>,
OPTIC: 1 <CR>, <ESC>.

c. SS <CR>,
PM #1 : 1,2048 <CR>, <ESC>.

2. Connect a scope to ANALOG COMPUTER to the INPUT TP and OUTPUT TP of

channel # 1.

a. Verify that the signals are not distorted.

b. Close the PM channel and verify that the signals are set to 0 V:

SS <CR>,
PM #1 : 0,2048 <CR>, <ESC>.

Scope setup: DC, 0.5 V/div, 0.2 microsecond/div.

IN 0V

OUT 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 7-1. TP IN, OUT PM BIAS CHANNEL #1

3. Repeat this test to all the channels in the ANALOG COMPUTER, open the relevant PM
using the SS table.

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 10 JANUARY 1995
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8. TEST OF ELECTRONIC SIGNALS

The following procedure checks the function of electronic simulator:

1. FEI <CR>.
2. SIM <CR>,
ELECTRONIC: 1 <CR> <ESC>.
3. CONT <CR>,
NEGATIVE POS: 1 <CR>.
4. Connect a scope to ANALOG COMUPTER TP OUT: ZENR, ZNRM, +X and +Y.
Scope setup: DC, 0.5 V/div, 0.2 microsecond/div.

SP4 : -Y
0V
SP4HR : -Y
SP6 : +Y

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 8-1. TP OUT Y

+X 0V

ZENR 0V
TIMEBASE = 0.2 microsec/div
CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 8-2. TP OUT +X

ZNRM 0V

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 8-3. TP OUT ZNRM

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FRONT END CALIBRATIONS 11 JANUARY 1995
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9. TEST OF THE RADIOACTIVE SIGNALS

The following procedure checks the function of the summing amplifiers:

1. FEI <CR>.

2. Open all the PMs by: GSET ALLS 1 <CR>.

3. Place a Co57 source with a count rate of 10 - 30 kc/s at a distance of 2 meters from the
camera head.

4. Connect a scope to ANALOG COMPUTER TP OUT: BIAS, ZENR, ZNRM, +X, +Y,
-X, -Y.
Scope setup: DC, 0.5 V/div (TP BIAS: 0.1 V/div), 0.2 microsecond/div.

BIAS 0V

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.1 V/div
CHAN B = 0.5 V/div

Figure 9-1. TP BIAS

ZNRM 0V

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 9-2. TP OUT ZNRM

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+X 0V

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 9-3. TP OUT +/-X

+Y 0V

ZENR 0V

TIMEBASE = 0.2 microsec/div

CHAN A = 0.5 V/div
CHAN B = 0.5 V/div

Figure 9-4. TP OUT +/-Y

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FRONT END CALIBRATIONS 13 JANUARY 1995
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10. CALIBRATION OF THE OFFSETS AND GAINS USING ELECTRONIC
SIMULATOR

Calibration of the OFFSETS and preliminary calibration of the GAINS of ZENR, SCA, ZNRM,
X, Y, in SLOW and FAST modes:

1. AUTOCAL OPTIC N <CR>.

NULXE <CR>,
NULYE <CR>.

2. Change to FAST MODE:

Type CONT <CR>,
SLOW MODE: 0 <CR>, <ESC>.
NULYE <CR>,
NULXE <CR>.

3.
a. Type SCAL <CR>, and then FCAL <CR>.
Verify that in both tables all the calibration numbers are within the range of 500 to
3500.

b. Add 300 chan. to the DENOMINATOR offset found by the electronic calibration
of NULXE and NULYE; 300 chan. are usually the difference between the electronic
and optic calibrations of the DENOMINATOR. It will set the DENOMINATOR
offset to the range of 1600-1800 chan.
This correction is needed for accurate measurement of ZNRM in the following HV
ADJUST.

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FRONT END CALIBRATIONS 14 JANUARY 1995
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11. CALIBRATION OF THE H.V.

After calibrating the ZNRM offsets in paragraph 10, an initial calibration of the H.V. is performed
as follows:

1. Shut down the H.V. P.S. and connect an attenuation box in serial to the H.V. output,
connect DVM to the box test point, turn on the H.V.

2. Place a Tc99M source at a distance of about 2m from the detector.

Verify that the F.O.V. ring is mounted.

3. Enter acquisition:
STAT <CR>,
WINDOW: 60 <CR>, MODE : NORMAL <CR>,
COLLIMATOR: NOESL <CR>, <ESC>.

The rate should be around 20 kc/s.

4. Connect a scope to ZNRM test point TP8X(Y) on the ANALOG CHANNEL board.
Measure the signal pulse amplitude, it should be:
0.95 V for Tc99m
0.8 V for Co57.

Peak measurement should include the base line offset.

Scope set up: DC, 0.5 V/div, 0.2 microsecond/div.

ZNRM
Tc99m

0V
TIMEBASE = 0.2 microsec
CHAN A = 0.2 V/div

Figure 11-1. TP8 (X) ZNRM

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FRONT END CALIBRATIONS 15 JANUARY 1995
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5. If the required signal amplitude is not achieved change the HV as follows:

Type PORT <CR>

PORT: 0382 <CR>
Change DEC-VAL: XXXX <CR>

Increase if the signal amplitude is low.

Decrease if the signal amplitude is high.

6. Measure with DVM the HV voltage, it should be below the maximum working voltage
of the PM:

1450 V for HAMAMATSU and PHILIPS.

1200 V for RCA.

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FRONT END CALIBRATIONS 16 JANUARY 1995
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12. FIRST CALIBRATION OF ZENR AND SCA CHANNEL USING
RADIOACTIVE SOURCE

Using the same source set up as above (paragraph 11), continue and calibrate the SCA and ZENR
gains in SLOW and FAST modes as follows:

1. Set to SLOW MODE and offset calibration:

Type FEI <CR>.
Type AUTOCAL OPTIC NO <CR>.

2. Type SGR <CR>,

ENTER CENTER LINE IN KEV: 140 <CR> for Tc99m
122 <CR> for Co57.
CALC. SCA REF.? (Y=1/N=0) 1 <CR>.

Wait until execution of the function is completed.

3. Type EGR <CR>,

TRACE: 0 <CR>
REQUIRED VALUE: 350 <CR> for Tc99m
305 <CR> for Co57.
CALCULATE REFERENCE VALUE: 1 <CR>.

Wait until execution of the function is completed.

4.
a. Change to FAST MODE:
Type CONT <CR>,
SLOW MODE: 0 <CR>, <ESC>.

b. Repeat steps 2 and 3.

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FRONT END CALIBRATIONS 17 JANUARY 1995
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13. FIRST TEST OF SCA AND ZENR WIDNDOWS MATCHING AND
ELECTROVICE REFERENCE VALUES

After the SCA and ZENR channels are calibrated check that the 2 channels are matched using the
same source as in paragraph 12 above, as follows:

1. Type FEI <CR>.

2. Wide window:
Type EX109 <CR>.
Type MCA Z <CR>, <ESC>. accumulate up to 100K counts and then press <ESC>.
Move the cursor and measure the peak.
Write down the value in your notebook .

3. Narrow window:
Type WIND <CR>.
WINDOW A, LOWER: 130 <CR>. UPPER: 150 <CR> for Tc99m.
112 <CR> 132 <CR> for Co57.
Type MCA Z <CR>, <ESC>. Accumulate up to 100K counts and then press <ESC>.
Move the cursor and measure the peak.
Write down the value in your notebook.
The difference between the wide and the narrow window peaks should be less than
+3 chan.

4. Calculate SCA and ZENR with the electronic simulator as follows:

a. Type: FEI <CR>
SGE <CR>
EGE <CR>
b. Repeat steps 2 & 3 above.
c. If the results are faulty, change the SCA gain in FES1 Table until the results are
correct.

5. Repeat step in FAST MODE.

a. Type: CONT <CR>
SLOW MODE 0 <CR> <ESC>.
b. Repeat steps 2 through 4.

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FRONT END CALIBRATIONS 18 JANUARY 1995
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14. TEST OF THE ZENR AND ZNRM NOISE

The following procedure measures the resolution of ZENR by using an electronic simulator
signal, which is injected to one of the channels while all PMs are open.

1. Remove radioactive source from detector.

2. Type FEI <CR>.

3. Open all PMs by typing GSET ALLS 1 <CR>.

4. Open electronic simulator:

SIM <CR>,
ELECTRONIC: 1 <CR>,
INTENSITY: 300 <CR>, <ESC>.

5. Type MCA Z <CR>, <ESC>.

A histogram of ZENR will be built. Accumulate 100K counts.
Measure the PEAK and FWHM of the histogram.
The FWHM should be less than 6 chan.
Write down the peak location.

6. Close all the PMs and read the MCA Z peak:

GSET ALLS 0 <CR>,
MCA Z <CR>, <ESC>, accumulate 100K counts.
Measure the PEAK and the FWHM.
The FWHM should be less than 4 chan.
Write down the peak location.

The difference between the peaks in steps 5 and 6 should be less than 2 chan.

7. Repeat noise and offset test for ZNRM channel:

Type CONT <CR>,
Set Z ENER/NRM: 1 <CR>, <ESC>.

Repeat steps 5 and 6:

FWHM all PMs open: 4 chan.
FWHM all PMs closed: 2 chan.
PEAK shift between PMs open and closed: 2 chan.

NOTE: In systems equipped with D6 (PM pre amp) as IN4151 and not BAS45 as it
is today, the peak offset shift can reach 5 chan.

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FRONT END CALIBRATIONS 19 JANUARY 1995
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15. CALIBRATION OF THE IMAGE SIZE AND CENTER

The following procedure determines the image size and center. It is used as prerequisite for the
rough iterative calibration which follows this paragraph. The calibration is performed by
changing the X and Y gains and offset parameters during acquisition:

1. Verify that the F.O.V. ring is installed on the detector.

2. Calibrate the image offsets and gains using electronic simulator by typing:
FEI <CR>
AUTOCAL OPTIC N <CR>.

3. Perform a static acquisition, Tc99m, with the following setup:

STAT <CR>,
WINDOW: 30 <CR>,
MODE: FAST <CR>,
COLLIMATOR: NOLES <CR>,
SCREEN AREA: E <CR>, <ESC>.
Verify that the count rate is approximately 15 kc/s.
Press START to start the acquisition.

4. Create a ROI by pressing the ROI push button:

RECTANGULAR ROI of 488 x 488 for SP-6,
CIRCULAR ROI of R=236 for SP-4, SP-4M, SP-4HR.
Don’t move ROI center, play with ROI size only. Read ROI size using FIX push button.
This can be performed by the command line:
RECTANGULAR ROI: CRTRR 12;12;488;488;E <CR>.
CIRCULAR ROI: CRTCR 256;256;236;0;E <CR>.

5. Type CONT <CR>,

MULTI-BUS: 0 <CR>, <ESC>.
This enables you to change manually the FE parameters during acquisition.
Verify SLOW MODE: 0.

6. Type EX109 <CR>.

7. Check the acquired image: if it touches the ROI line all around the image borders with
no offset shift to X or Y, the calibration is completed.
Otherwise, change the appropriate parameter as follows:
a. Type NFCAL <CR>: it enables changes in the FCAL table during acquisition.
b. Change the image size by changing the X and Y GAIN values. Increasing the
numbers will increase the size.
c. Change the image center by changing the X and Y OUTPUT OFFSET values.
Increasing the X number will move the image to the left.
Increasing the Y number will move the image downward.
After entering the changes, press <ESC>.

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FRONT END CALIBRATIONS 20 JANUARY 1995
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d. Erase the existing image and observe the effect of the changes. If necessary, type
NFCAL <CR> again, and repeat steps b and c until a satisfactory image is obtained.

8. Finish the acquisition and write in your notebook the FCAL values:
X and Y OUTPUT OFFSET
X and Y GAIN.

9. Enter FES2 and verify that OPT. SIM. REF is initially at 100 (final value will be
determined later in the NULLING procedure, Section 24).
Change FES1 OUTPUT OFFSET and POS GAIN reference number and calibrate
afterwards the OUT X, Y and POSX, Y in order to meet the new FCAL parameters
found in step 7 as follows:

a. Type FES1 <CR>.

b. In order to increase the FCAL OUTPUT offset:
Increase the FAST OUTPUT reference.
Afterwards perform OUTX <CR> or OUTY <CR>.
c. In order to increase the FCAL GAIN:
Decrease the FAST POS GAIN reference .
Afterwards perform POSX <CR> or POSY <CR> .

10. Repeat the whole procedure (steps 2 through 9) for SLOW MODE with the following
changes: MODE: NORM, in Step #5 verify SLOW MODE: 1, instead NFCAL type
NSCAL, and in FES1 change the SLOW references.

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16. ROUGH CALIBRATION OF THE PMS

Following the image size calibration, the first ITERATIVE calibration can be performed to reach
a better energy distribution. It is achieved by calibration of each PM to generate the radioactive
peak when all the other PMs are open.
Follow the procedure below:

1. Remove the F.O.V ring from the detector.

Type GSET <CR>,
Set ALL GAIN: 2048 <CR>, <ESC>.

2. Place a radioactive source of Tc99m , count rate of 70-80 kc/s in FAST mode at a
distance of 2 m from the detector.

3. This step is to be performed in SP-6 only.

For: SP-4, 4M, 4HR skip to step 4.

a. Type CONT <CR>,

Set MULTIBUS: 0 <CR>,
Set SLOW MODE: 0 <CR>, <ESC>.

b. Type EX109,
Type MCA Z <CR>, verify that ZENR peak is 350 +5 chan.

c. Activate STATIC Tc99m with no correction maps:

Type STAT <CR>,
WINDOW : 30 <CR>,
MODE : FAST <CR>,
COLLIMATOR : NOESL <CR>, <ESC>.

Observe the image: if the corner PMs do not have any counts, remain in persistence
mode, push EXIT function key and perform the next step d.
If the image is good, skip to e.

d. Type PORT <CR>.

Set PORT: 0382 <CR>, (H.V. port).
Change the DEC VAL: XXXX <CR>.
Decrease the values by 100 chan, observe the image again and repeat this decreasing
until the corners will have equal intensity as the middle PMs, <ESC>.

e. Press EXIT to return to persistence mode, exit the acquisition panel by <BREAK>.

4. Type ITERCAL 350 <CR>.

Press any key and wait until ITERCAL is completed.
The procedure depends on the source count rate and on the number of the PMs: it takes
between 6 - 8 minutes.

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5. Type SS <CR>, verify that the calibration numbers for all the PMs are in the range of
500 to 3500, <ESC>.

6. If all the values are within this range, the calibration process has been completed.

7. Otherwise, increase or decrease the HV to optimize the PMs gain as follows:

a. PORT <CR>,
PORT: 0382 <CR>,
Change DEC VAL: XXXX <CR>, by steps of 6 numbers.
Increase if the SS numbers are too high, <ESC>.
Decrease if the SS numbers are too low , <ESC>.

b. Repeat steps 4 - 7.

8. Record the SS table on a polaroid film.

9. Update the ZENR gain in SLOW mode to the new PMs gain setup by new EGR:

a. Place FOV ring on the detector.

Place a radioactive source of 20 kc/s in front of the detector at a distance of 1.5 to 2
m.

b. Type: FEI <CR>

EGR <CR>
TRACE: 0 <CR>
REQUIRED VALUE: 350 <CR> for Tc99m
305 <CR> for Co57
CALCULATE REFERENCE VALUE:1 <CR>

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17. TEST OF ZNRM DYNAMIC RANGE USING A RADIOACTIVE SOURCE

The result of the rough iterative calibration (previous paragraph) is a uniform energy distribution
of the PMs. Following this step check the ZNRM channel dynamic range:

1. Place a radioactive source Ba133 at a distance of about 2m from the detector.

Prepare a scope with 2 probes.

2. Type FEI <CR>.

3. Prepare the system for acquisition: type EX109 <CR>.

4. Set the WINDOW parameters:

WINDOW <CR>,
A: 1 <CR>,
LOW LIMIT: 250 <CR> UP LIMIT: 500 <CR> for Ba133 (I131)
30 <CR> 100 <CR> for Am241 (Tl201)
RANGE: 1 <CR>, <ESC>.

5. Determine the EV thresholds:

EV <CR>
LOW LIMIT: 100 <CR> UP LIMIT: 650 <CR> for Ba133 (I131)
30 <CR> 650 <CR> for Am241 (Tl201)

6. Connect probe A to GIGT TP on the CONTROL card, synchronize the time base
according to the GIGT signal.

Connect probe B, DC input, to TP8 X on the ANALOG CHANNEL card (ZNRM

signal). Adjust the DC zero base line first.

The average signal amplitude at TP8 X(Y) should be:

Ba133: 2.4 V (production),

I131 : 2.45V (field).

Scope setup: 0.5V/div, 0.2 microsecond/div.

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ZNRM
Ba133

0V
TIMEBASE = 0.2 microsec
CHAN A = 0.5 V/div

Figure 17-1. TP8 (X) ZNRM

7. Verify the ZNRM offset for the low energy isotopes, measured in the same way at TP8
X(Y):

Am241: 0.4 V (production)

Tl201: 0.45-0.55 V (field)

Scope setup : DC, 0.2V/div, 0.2 microsecond/div.

ZNRM
Am241

0V
TIMEBASE = 0.2 microsec
CHAN A = 0.2 V/div

Figure 17-2. TP8 (X) ZNRM

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18. SECOND CALIBRATION OF SCA AND ZENR

Updating the SCA and ZENR gains after H.V. calibration in step 17 for SLOW and FAST
modes:

1. Type FEI <CR>,

Type AUTOCAL OPTIC N <CR>.

2. Place a radioactive source, Tc99m (or Co57) with a count rate of 15 kc/s, at a distance of
about 2 m from the detector.
Verify that the F.O.V ring is mounted.

3. Type SGR <CR>,

ENTER CENTER LINE IN KEV: 140 <CR> For Tc99m.
122 <CR> For Co57.
CALC. SCA REF.?(Y=1/N=0): 1 <CR>.

4. Type EGR <CR>.

TRACE: 0
REQUIRED VALUE = 350 <CR> for Tc99m
305 <CR> for Co57.
CALCULATE REFERENCE VALUE: 1 <CR>.

5. Repeat for FAST mode as follows:

a. Type CONT <CR>,
SLOW MODE: 0 <CR>, <ESC>.
b. Repeat steps 3 and 4 in FAST mode.

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19. TEST OF THE SCA AND Z ENERGY WINDOWS MATCHING AND
ELECTRONIC REFERENCE VALUES

After the SCA and ZENR channels are calibrated check that the 2 channels are matched using the
same source as in paragraph 12 above, as follows:

1. Place a radioactive source, Tc99m (or Co57) with a count rate of 20 kc/s, at a distance of
about 2m from the detector.

2. Type FEI <CR>,.

3. Wide window:
Type EX109 <CR>,
Type MCA Z <CR>, <ESC>. accumulate up to 100 K counts and then press <ESC>.
Move the cursor and measure the peak.
Write down the value in your notebook .

4. Narrow window:
Type WIND <CR>,
WINDOW A, LOWER: 130 <CR>. UPPER: 150 <CR> for Tc99m
112 <CR> 132 <CR> for Co57
50 <CR> 70 <CR> for Am241
60 <CR> 80 <CR> for Tl201
Type MCA Z <CR>, <ESC>. Accumulate up to 100K counts and then press <ESC>.
Move the cursor and measure the peak.
Write down the value in your notebook.
The difference between wide and narrow window peaks should be less than +3 chan.

5. Calculate SCA and ZENR with the electronic simulator as follows:

a. Type: SGE <CR>
EGE <CR>
b. Repeat steps 3 & 4 above.
c. If the results are faulty, change SCA gain in FES1 Table until the results are correct.

6. Repeat in FAST MODE.

a. Type: CONT <CR>
SLOW MODE 0 <CR> <ESC>.
b. Repeat steps 3 through 5.

7. Repeat steps 2 through 4 for Am241 (Tl201); use the appropriate narrow window.

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20. CALIBRATION OF THE LED DRIVER

Calibration of the LED DRIVER is performed after the ZENR gain is calibrated, and before the
PMs optic references in the next paragraph.

1. Type FEI <CR>.

Type AUTOCAL OPTIC N <CR>.

2. Open OPTIC SIMULATOR:

Type SIM <CR>,
OPTIC: 1 <CR>,
INTENSITY: 2048 <CR>, <ESC>.

3. Open the PIN DIODE:

Type SS <CR>,
Set the PIN diode PD: 1 <CR>,
Verify that all the PMs are closed (set to 0).

4. Set window B to RANGE 2:

Type WIND <CR>,
WINDOW B, RANGE: 2 <CR>, <ESC>.

5. Type CONT <CR>,

CALIBRATION: 1 <CR>, <ESC>.
Type MCA Z <CR>, <ESC>.

Adjust POT RV1 on the LED DRIVER card to get the pin diode peak between 150 and
280.
Record the value in your notebook.

6. Type FES1 <CR>.

Enter the value recorded in step 6 into the field of the OPTIC SIM PIN DIOD
REFERENCE: 2, XXX <CR>, <ESC>.

7. If it is impossible to get the MCA Z value for RANGE 2 higher than 150:
a. Change WINDOW B to RANGE 1:
Type WIND <CR>, move to window B and set the RANGE: 1 <CR>, <ESC> .
b. Repeat steps 6, 7.

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21. CALCULATION OF THE PMS OPTICAL REFERENCE

This procedure is performed after the PMs gains are calibrated with the ROUGH ITERATIVE,
and after the ZENR gain is calibrated. First the LED INTENSITY is checked and then the
OPTICAL FIBERS are adjusted for uniform light distribution to all the PMs.
To calculate the optical reference of the PMs (SOR table), perform the following:

1. Remove the radioactive source from the detector.

2. Type FEI <CR>.

3. Type PMGR <CR>, set the panel to the following values:

RADIO CALIB : 0,
TRACE : 0,
OPTICAL REF : 1 <CR>, <ESC>.

The computed simulator intensity is displayed.

Verify that the simulator intensity is 2048 +100 chan.

4. Type SOR <CR>, review the PMs reference numbers.

The acceptable conditions are:
None of the optical references is in Range 0.
For PMs with Range 3, the reference value is under 200.

a. If there are many reference values in Range 0, but there are no references or only a
few in Range 3, increase the PIN DIODE reference value in table FES1:
FES1 <CR>,
PIN DIODE REF: X,XXX <CR>, <ESC>.

b. If all the reference values in Range 3 are higher than 200, decrease the PIN DIODE
reference value in table FES1:
FES1 <CR>,
PIN DIODE REF: X,XXX <CR>, <ESC>.

c. If some of the reference values in Range 3 are higher than 200, and some are in
range 0, the fiber intensity has to be adjusted:

• Identify the fiber corresponding to the PMs whose references are not
acceptable.

• Open optic simulator with the same intensity found by PMGR procedure above:
SIM <CR>,
OPTIC: 1 <CR>,
INTENSITY: XXXX <CR>, <ESC>.

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• Open the PM with unacceptable reference number:
SS <CR>,
PM #: 1 <CR>, <ESC>.
WINDOW <CR>, change WINDOW B RANGE to the range registered in
SOR table.

• Activate MCA Z <CR>, <ESC> and read the PM output. At the same time
open the Allen screw locking fiber to the lens cylinder, move the fiber in and
out of the cylinder in order to get the required reference.

Note that each fiber injects light to groups of 3 PMs, and changing one reference might
influence the other.

5. Repeat PMGR as in step 3:

FEI <CR>,
PMGR <CR>,
RADIO CALIB: 0,
TRACE: 0,
OPTIC REF: 1 <CR>, <ESC>.

If there still are PMs with unacceptable references try again step 4c, until all the PMs are
adjusted.

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22. TEST OF THE OPTICAL SYSTEM OPERATION

The operation of the optical system is tested immediately after its calibration. Before starting the
following procedure, record the values in the SS table in a notebook or on a polaroid film.

To test the operation of the optic system, perform the following:

1. Type PMGO <CR>.

ALL PMS (Y/N) : Y <CR>.

Wait until the function ends.

2. Type SS <CR>,
Check the gain values, compare them to the polaroid film taken at the beginning.
Acceptable differences: 5 chan - Hamamatsu PMs
8 chan - Phillips PMs

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23. TEST OF THE OPTIC SYSTEM DYNAMIC RANGE

After running the ITER program and calculating the optic REF, activate the TPMGO program:
the function enables a better "calibration point" of the PM.
TPMGO function samples the output of each PMT, using the optic simulator, calculates the PM
dynamic range, and checks how close its SS value is to the limits. When the SS value is closer
than 500, an arrow will be displayed near the "max. domain" value.
To run the TPMGO function perform the following:

1. Set the PMTs gain to 1000:

Type GSET ALLG 1000 <CR>.

2. Type TPMGO <CR>.

Wait until the program is finished, then:

3. Type PWSCROLL <CR>.

Using the vertical arrow keys trace all the PMs and make sure that THERE IS NO
ARROW DISPLAYED next to the maximum domain value.
For each PM with an arrow sign run the following procedure:
a. If the arrow appears without any other indication then the calibration value is closer
by less than 300 to either the maximum domain value (the maximum domain may
be 3968 which is the last calibration value of the calibration program) or to the
maximum value before slope change in the response gain curve of the PMT (the SS
value from which the tube's gain starts to decrease instead of increasing).
b. If the arrow appears with an indication of the OVF (overflow), then close to the
calibration value the Ze channel is overflowed by the optic signal.

4. For the first and second case (3a) the HV must be increased.

5. For the third case (3b), if there are many PMTs in that situation, the HV must be
decreased, providing the SS values are not too high (more than 2800). If a small number
of PMTs are problematic, then try to increase the quantity of light they receive, by
inserting the fiber deeper in the "lens housing".
a. Write down the range and the 'value' of the PM from the SOR table.
b. Open the head's cover.
c. Locate the fiber closest to the PM.
d. Insert the fiber deeper in the "lens housing".
e. Determine new optical REF for the PM by typing:
PMGR <CR>.
OPTIC REF: 1 <CR>,

6. Start again from step 1 until there is no arrow displayed by TPMGO (see 2).

For software versions before V3.05 the TPMGO function will be loaded from a diskette:
FUNCOPY R; TPMGO <CR>.

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24. CALIBRATION OF THE DENOMINATOR OFFSET AND NULLING

Optic Calibration of the Denominator Offset follows the adjustment of the optic system. It is
performed in SLOW mode and then repeated in FAST mode .
The procedure was changed in V3.12 in a way that only 2 opposite PMs are activated during the
calibration and not all PMs are open as in V3.05.
To perform the calibration do as follows:

1. Calibrate offsets and gains:

Type FEI <CR>.
Type AUTO OPTIC NO <CR>.
Type PMGO Y <CR>.

2. Type SIM <CR>.

OPTIC : 1 <CR> ,<ESC>.
Connect scope to ZNRM TPX(8), adjust the DC base line.
Scope setup :0.5 V/div, 0.2 microsecond/div.

3. In V3.12 and up:

Type SS <CR>
Open PM #50 (for SP4-HR systems)
Open PM #51 (for SP6 systems)
Open PM #33 (for SP4, SP4M systems)

In V3.05 and below:

Type GSET ALLS 1 <CR>.

4. Type CONT <CR>

CALIBRATION: 1 <CR>
NEGATIVE POS: 1 <CR>, <ESC> .

5. Set window B to RANGE 3:

Type WIND <CR>,
Change range in window B: 3 <CR>, <ESC> .

6. Activate ADC function for ZENR:

Type ADC <CR>
PORT :03F4 (default)
AVERAGE OF : 2**8 <CR>
Observe the curve, it should be as in the Figure 24-1.

Adjust RV3 potentiometer in the LED DRIVER Card to obtain the correct limits of
Ymin and Ymax as indicated in the figure.
Activate the histogram, activate a marker and measure the Ymax. Record the value in
your notebook.

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Y
Ymax

Ymin
X

Figure 24-1. ADC ZENR

In V3.12 and up: In V3.05 and below:

Check Ymin <= 15 and Check Ymin <= 50 and
Ymax >= 150 Ymax >= 320

7. Change in CONT from negative position to positive position:

CONT <CR>
NEGATIVE POS : 0 <CR>
POSITIVE POS : 1 <CR> , <ESC> .

8. In V3.12 and up:

Type SS <CR>
Open PM #38, close PM # 50 (for SP4-HR systems)
Open PM #39 , close PM # 51 (for SP6 systems)
Open PM #24 , close PM # 33 (for SP4, SP4M systems)

In V3.05 and below:

All PMs are left open.

9. Repeat step 6. This time adjust RV2 potentiometer to obtain the correct limits of Ymin
and Ymax.
Record the Ymax value in the curve.

10. Verify that ZNRM in Ymax does not exceed 2.5V :

a. Take the smaller value between the two Ymax recorded in steps 6 & 9, multiply it
by 0.9 (10% less), record the value in your notebook.

b. Activate the histogram which belongs to the smaller Y found in step 10a .

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c. Create a marker, read the intensity of Ymax, (on X axis) and multiply by 0.9.

d. Transfer the intensity value found in 10c to 12 bit by multiplying it by 16.

Type SIM <CR>, the OPTIC simulator is already open, insert the calculated value
in the INTENSITY: XXXX <CR>, <ESC>.

e. Read on the scope the ZNRM TP8(X) amplitude: it should be equal or less than
2.5V; if it is so, introduce the result of 10a to FES1 at Optic Simulator Reference for
Slow maximum.

MIN [ ] [ ] ; MAX [ ] [*]

f. If ZNRM TP8(X) is higher than 2.5V: reduce the simulator intensity until ZNRM
amplitude shows 2.5V, and <ESC> the simulator.
Read the ZENR by typing AV <CR> for 2**15 counts.
Insert the new value to FES1 at optic simulator reference for SLOW maximum

MIN [ ] [ ] ; MAX [ ] [*]

11. Reading ZENR channel when ZNRM TP8(X) is equal to 0.5V without changing the
setup.

a. Type SIM <CR>

Change INTENSITY : XXXX <CR>, until ZNRM TP8(X) signal amplitude is
0.5V, <ESC> .

b. Type AV <CR>. Read the ZENR for 2**15 counts. Introduce this value in FES1
at OPTIC SIM. REFERENCES for SLOW MIN.

MIN [ ] [*] ; MAX [ ] [ ]

12. Repeat the whole procedure, steps 1 to 11, for FAST MODE. Do not change RV3, RV2
adjustment.
Read the ZENR values as found in steps 10 and 11. REFERENCES for FAST.
Insert the two values in FES1 table for OPTIC SIM.

MIN [*] [ ] ; MAX [*] [ ]

13. Calculate the average of the MIN and MAX of the SLOW and FAST reference numbers
in FES1:

MIN [A] [B] ; MAX [C] [D]

Perform: (A+B+C+D)/4 = E
Type FES2 <CR>, insert the calculated value E:
OPT. SIM. REF(POSITION GAIN): value E <CR>, <ESC>.

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14. Check the references for SLOW MODE by performing the following calibration:
Type FEI <CR>.
Type NULX <CR>.
Type POSX <CR>.
Type NULY <CR>.
Type POSY <CR>.
Type SCAL <CR>.

Verify that the calibration numbers are between 500 and 3500.

15. Check the references for FAST MODE:

Type CONT <CR>.
SLOW MODE: 0 <CR>, <ESC>.
Type NULX <CR>.
Type POSX <CR>.
Type NULY <CR>.
Type POSY <CR>.
Type FCAL <CR>.

Verify that the calibration numbers are between 500 and 3500.

16. Run AUTOCAL STATUS Y <CR>, verify that no error appears.

Check that SCAL, FCAL tables are within the tolerance of +5 chan, compare to what
you have seen in the SCAL and FCAL tables while running paragraphs 14, 15.

17. Close the detector with all the nominal covers.

WAIT AT LEAST 12 HOURS BEFORE PROCEEDING.

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25. FINAL CALIBRATION OF THE IMAGE SIZE AND CENTER

The following procedure is a repetition of paragraph 14. It is used as preparation to the final
ITERATIVE calibration. The procedure is carried out only after 12 hours have passed from the
time the head was closed, and after it had reached the nominal working temperature.

1. Run AUTOCAL STATUS Y <CR>.

2. Check according to paragraph 15 the image size and center for SLOW and FAST modes.
If necessary update the FES1 reference numbers which may not fit the new head
condition after warm up.

26. FINAL ITERATIVE CALIBRATION

Before performing the following procedure, check that the detector was closed and in working
mode for at least 12 HOURS.

1. Type AUTOCAL STATUS Y <CR>.

2. Remove the FOV frame.

3. Place the radioactive source, Tc99m, with a rate of 70 to 90 kc/sc, at a distance of about 2
m from the detector.

4. Type ITERCAL 350 <CR>.

Set the radioactive source and strike any key.

5. Replace back the FOV frame, reduce the count rate to 20 kc/s and run fine ITERCAL
with following parameters:

ITER 350; Y; 32, 32 ; 9000, 9000 ; 10, 10 ; 3, 1 <CR>.

6. Type SS <CR>.
Check that all the gain values are under 3500 and over 500.

7. Perform final ITERATIVE calibration with the same parameters of the QKWKQC or
DLQC preset for versions below 5:

ITER 350; Y; 16, 32, 32; 1000, 2500 ,2500; 20, 10, 10; 19, 9, 3 <CR>.

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27. FINAL CALCULATION OF PMS OPTICAL REFERENCE

The final calculation of the Optical Reference for the PMs is performed after all the parameters
have been calibrated, and IMMEDIATELY after the final iterative calibration.

1. Remove the radioactive source from the head face.

2. Type FEI <CR>.

3. Type PMGR <CR>, set the panel to the following values:

RADIO CALIB : 0 <CR>,
TRACE : 0 <CR>,
OPTICAL REF : 1 <CR>, <ESC>.

Wait until the calculation is completed.

4. Type SOR <CR>.

Verify that the optical references for the PMs are in ranges 1, 2, and 3.
References in range 3 should be lower than 200 .

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28. FINAL TESTS - SYSTEM VERIFICATION AS A PREREQUISITE FOR
MAPS

The following tests are performed to verify that the system is ready for MAPS procedure:

1. Type AUTO STATUS Y <CR>, wait for the function to end.

a. Type SCAL <CR>. Verify that all calibration numbers are in the range 500 to 3500.
Record the values on polaroid film and press <ESC>.

b. Type FCAL <CR>. Verify that all calibration numbers are in the range 500 to 3500.
Record the values on polaroid film and press <ESC>.

c. Type SS <CR>, compare the values with the last ITERATIVE calibration:
differences should be smaller than 12, press <ESC>.

2. Check the PMs DYNAMIC RANGE:

Type GSET ALLG 1000 <CR>.
Type TPMGO <CR>.
Type PWSCROLL <CR>, see that no arrow with OVF appears.

3. Check the PEAK and FWHM in FAST:

Type FEI <CR>.
Type EX109 <CR>.
Set the system to FAST :CONT <CR>.
Change the SLOW MODE : 0 <CR>, <ESC>.
Type MCA Z <CR>, <ESC>, waits to 100K counts and <ESC>.
Move the marker and read the PEAK and the FWHM.

The Tc99m peak value should be: 50 +3 chan. for SP-6

352 +3 chan. for SP-4
345 +3 chan. for SP-4HR

The FWHM value should be: 12.5% for SP-4,4HR,4M

13.2% for SP-6,6HR

4. Check the PEAK and the FWHM in SLOW:

Set the system to SLOW : Type CONT <CR>.
Change the SLOW MODE: 1 <CR>, <ESC>.
Type MCA Z <CR>, <ESC>, wait to 100K counts and <ESC>.
Move the marker and read the PEAK and the FWHM.

The Tc99m peak value should be: 350 +3 chan. for all models.

The FWHM value should be: 12.5% for SP-4,4HR,4M

13.2% for SP-6,6HR

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5. Check the image size and center in SLOW and FAST:

a. Verify that the FOV is attached and place a Tc99M (Am241, Ba133) source of about
250 microCurie at a distance of about 2 m from the detector.

b. Perform a static acquisition, at both NORMAL and FAST modes with the following
parameters:
STAT <CR>,
WINDOW : 30 <CR>,
MODE : NORMAL <CR>, or FAST <CR>,
COLLIMATOR : NOELS <CR>,
IMAGE SIZE : E <CR>, <ESC>.

c. Activate the ROI push button, and verify that the acquired image dimensions are:

488 x 488 for SP6.

236 radius for SP4 ,SP 4M ,SP4HR.

6. Check the system MAXIMUM COUNT RATE:

SLOW 10% WINDOW :90 kc/s

FAST 15% WINDOW :400 kc/s

7. Check the system SPATIAL RESOLUTION.

N/A

If all the above tests are passed, the FRONT END calibration has been SUCCESSFULLY
COMPLETED.

29. BACK UP THE FEE PARAMETERS

Insert the USER diskette into the floppy drive and back up the FEE PARAMETERS as follows:

Type USER 1 <CR>, confirm the backup : Y <CR>.

APEX SP-4, SP-4M, SP-4HR, SP-6 490-3031-050/A

FRONT END CALIBRATIONS 40 JANUARY 1995