Philips CARDIOMD Service Manual page 72

Detector Calibration
Procedure
16. Place the point source holder at a mini-
mum distance of approximately 1.85 me-
ters (6 ft.) from the detector to be cali-
brated.
17. Place a Tc-99m point source of approxi-
mately 40 MBq or 1 mCi in the holder.
18. Make sure that the entire detector FOV is
exposed to the source and that the count
rate is < 40 kcps.
Note. The detector to be calibrated must not
have a collimator mounted.
19. Click Start to acquire the window 1 spec-
trum.
When the message box with the text Itera-
tion 1 appears:
Note. Do not click OK until the source has
been replaced.
20. Remove the Tc-99m source and place the
other source (Tl-201, Ga-67, Ba-133 or
Am-241) in the source holder.
21. Now click OK.
When the message box with the text Itera-
tion 2 appears:
22. Click OK to acquire the window 3 spec-
trum (if the field Window 3 was not left
blank).
When all energy spectra have been acquired,
the procedure is completed and this message
appears.
23. Click OK to close the message.
Typical energy coefficients are:
•
Parameter C0: – 0 +/– 20
•
Parameter C1: – 1 +/– 0.3
•
Parameter C2: – 0 +/– 0.002
Note. These values apply, regardless of the
isotope used.
24. Repeat the procedure to calibrate the other
detector, or
25. Click Exit to close the ECal page.
4-16 CardioMD Service Manual
Details
185 +/- 3 cm
185 +/- 3 cm
1MAN0158-H11 04-2005 CSIP Level 1