Detector Performance Tests; Center Of Rotation (Cor) Analysis; Flood Uniformity Test; Description - Philips CARDIOMD Service Manual

4.3 Detector Performance Tests

The verification procedures described in this section are to be performed in the field during instal-
lation, when directed by another procedure, or as part of normal maintenance.
4.3.1

Center of Rotation (COR) Analysis

4.3.1.1

Description

COR analysis is performed to test the center of rotation registration of the detector. A center of
rotation correction is used when reconstructing tomographic data to correct for minor misalign-
ment between the center of the image and the axis of rotation. Center of rotation (COR) correc-
tions are stored in a correction table and are applied as the data set is being acquired.
A COR correction is specific to a collimator. Therefore COR analysis should be performed for
each set of collimators.
Note. It is necessary to acquire a COR correction for each collimator that is used for tomographic
scans.
4.3.1.2

Center of Rotation Analysis Procedure

To be performed:
Detector:
Source:
Total calibration time:
See the procedure in Chapter 5 Maintenance of the CardioMD Operator's Manual.
4.3.2

Flood Uniformity Test

4.3.2.1 Description
The flood uniformity test ensures that the uniformity of the camera field is sufficient to prevent
the introduction of artifacts into clinical studies. The test is performed intrinsically or extrinsically,
using either Tc-99m or Co-57. You must ensure that appropriate uniformity correction can be
applied. The most accurate check is performed intrinsically with an intrinsically acquired uniform-
ity correction table applied.
After acquisition of the QC check image, a uniformity calculation is performed to present uni-
formity figures as well as images for visual inspection.
4.3.2.2

Flood Uniformity Check Procedure

See the procedure in Chapter 5 Maintenance of the CardioMD Operator's Manual.
1MAN0158-H11 04-2005 CSIP Level 1
After acquiring a COR correction.
Extrinsic (should be performed for each set of collimators used
for SPECT acquisition).
Specific isotope
LEHR collimator
LEGP collimator
Approximately 15 minutes.
~ 40 MBq or 1mCi point source
~ 40 MBq or 1mCi point source
CardioMD Service Manual 4-33
Calibration