Calibration
1MAN0158-H11 04-2005 CSIP Level 1
CardioMD Service Manual
4-17
4.2.5
Geometry Calibration (GeoCal)
4.2.5.1
Description
Geometry calibration adjusts the image geometry for symmetry and uniform spatial registration
over the energy range.
Four multiple energy point sources are placed on the outer calibration marks on the crystal surface
and two images of the point sources are acquired in a dual energy setup. The position of the im-
ages of the point sources is calculated for both of the two energies. Based on the result, the nor-
malization table is modified to correct for any mismatch. With this normalization table applied,
another iteration of acquisition and calculation is run to check the result. The process is repeated
(typically 5 to 10 times) until the specification is met.
Note
. If the CardioMD AC system is equipped with the AC option, the transmission scanners
must be removed before a GeoCal calibration can be performed.
Note
. GeoCal must be preceded by HV, PMT and ECal calibration. When GeoCal has been com-
pleted, a PMT update must be performed.
Note
. If GeoCal is required on one detector following high voltage calibration, perform a GeoCal
on the other detector, as well.
4.2.5.2
Geometry Calibration Procedure
To be performed:
When the EDC board, X-E board, Y board or crystal is re-
placed.
Detector:
One detector at a time with GeoCal mask (part of service
calibration kit).
Source:
4 sources, Ba-133, Ga-67 or Tl-201 of ~ 4 – 12 MBq or 0.1 –
0.3 mCi each.
Source holders:
4 pcs. with 4 bottles (part of service calibration kit).
Total calibration time:
Approximately 10 minutes per detector.
Calibration file created:
C:/Cardiocam/calibrations/geocal.det1
and
det2
respectively.
Procedure Details
1.
Remove the collimators from the detector
to be calibrated. See the Operator’s Man-
ual for instructions.
2.
Ensure that the CardioMD system is in the
patient load position.
Summary of Contents for CARDIOMD
Page 1: ...CARDIOMD SERVICE MANUAL 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 10: ...Introduction x CardioMD Service Manual 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 16: ...Safe Operating Practices 1 6 CardioMD Service Manual 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 164: ...Detector Calibration Files 5 60 CardioMD Service Manual 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 328: ...Installation Procedures 9 38 CardioMD Service Manual 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 348: ...Planned Maintenance Procedures 11 6 CardioMD Service Manual 1MAN0158 H11 04 2005 CSIP Level 1 ...
Page 465: ......