Philips CARDIOMD Service Manual page 60

Detector Calibration
# *) Calibration
(8) UnifCor (isotope specific
uniformity calibration)
9 CorCor (center of rotation
calibration)
Table 4.1 Complete CardioMD calibration
*) Note. The calibrations are interdependent in a hierarchical order. Any calibration in the se-
quence must be preceded by all calibrations that have lower numbers. For example, before per-
forming ECor, all other calibrations preceding ECor in Table 4.1 must have been done.
Note. Before you are allowed to perform detector calibrations, you must enter a password. The
procedures described in the following sections identify when this is required. Once the password
has been entered, you will not need to re-enter the password for the remaining calibrations. All
menu options on the acquisition PC will remain enabled until you exit the CardioMD application
software.
Note. When you have completed the detector calibrations, remember to close down and then re-
start the CardioMD application software. This will disable access to the service calibration menu
options.
Note. Detector calibrations are saved as correction files on the acquisition PC. When any detector
calibration is performed, the corresponding correction file must not have the attribute read-only, as
would be the case if the correction file for some reason has been copied from a CD-ROM. There-
fore, before starting detector calibrations, verify that the calibration files involved do not have the
read-only attribute: Right-click on the file in the Windows Explorer and ensure that the Read-only
box is not checked. Names of calibration files are listed for each calibration procedure described
in this chapter.
If the existing correction file has the attribute read-only, a pop-up message is displayed when the
calibration is started. In this case, correct the attribute of the correction file: Right-click on the file
in the Windows Explorer and un-check the Read-only box.
Note. If the CardioMD system is equipped with the AC Option, the transmission scanners must be
removed and the system configured to run without the AC option before the following calibrations
and tests can be performed:
•
HVCal (high voltage calibration)
•
PMTCal (PMT basic calibration)
•
Ecal (energy calibration)
•
GeoCal (geometry calibration)
•
ECor (energy correction map calibration)
•
LinCor (spatial linearity map calibration)
•
All NEMA tests (see Chapter 10 NEMA Performance Measurement).
See Chapter 12 CardioMD AC Option for instructions on removing the transmission scanners.
4-4 CardioMD Service Manual
Equipment Isotopes
(point sources)
Point source holder As desired
(or flood phantom) ~ 40 MBq or 1 mCi
(intrinsic)
~ 120 – 200 MBq or
3 – 5 mCi (extrinsic)
Point source LEHR: 40–120 MBq
or 1–3 mCi
LEGP: 40–120 MBq
or 1–3 mCi
Approx.
duration per
detector
15 min.
15 min.
1MAN0158-H11 04-2005 CSIP Level 1