Center Of Rotation (Cor) Calibration; Description; Center Of Rotation Calibration Procedure - Philips CARDIOMD Service Manual

Detector Calibration
4.2.9

Center of Rotation (COR) Calibration

4.2.9.1

Description

A center of rotation correction is used when reconstructing tomographic data to correct for minor
misalignment between the center of the image and the axis of rotation. Center of rotation (COR)
corrections are stored in a correction table and will be applied automatically after a data set has
been acquired.
COR correction is collimator specific. It is necessary to acquire a COR correction for each set of
collimators used for tomographic scans.
4.2.9.2

Center of Rotation Calibration Procedure

To be performed:
Detector:
Source:
Total calibration time:
Calibration file created:
Note. Before the COR acquisition is started, the system identifies the type of the collimator
mounted on the detector. This enables the system to store the acquired COR corrections for a spe-
cific collimator under the matching file name.
Note. If a correction table for the type of collimators already exists, the system automatically
overwrites the old table immediately after the new correction table has been acquired.
Procedure
1. Verify that the collimators, for which the
COR correction is to be acquired, are
mounted on the detectors.
2. Ensure that the CardioMD system is in the
patient load position.
4-30 CardioMD Service Manual
When the EDC board, a PMT tube, X-E strip, Y strip or crystal is
replaced.
Extrinsic (should be performed for each set of collimators used
for SPECT acquisition).
Specific isotope
LEHR collimator
LEGP collimator
Approximately 20 minutes
C:/Cardiocam/calibrations/CORcor/CORcor.coll-X
where X represents the assigned collimator number:
0 = LEGP
1 = LEHR.
Details
40–120 MBq or 1–3 mCi point source
40–120 MBq or 1–3 mCi point source
1MAN0158-H11 04-2005 CSIP Level 1