Influence of collimators on SPECT center of rotation measurements: artifact generation and acceptance testing

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · J. Nucl. Med.; (United States)

OSTI ID:7074444

Cerqueira, M D; Matsuoka, D; Ritchie, J L; Harp, G D

Misalignment between the electronic and mechanical axes of rotation will result in artifact generation and image degradation during single photon emission computed tomography (SPECT) reconstruction. Acceptance and quality control testing procedures have not emphasized the variability in center of rotation (COR) measurements caused by collimators and the need to verify uniformity across the full collimator field of view (FOV). Variation from the mean COR across the FOV was tested in four different collimators using multiple point source acquisitions. The mean COR was different for each collimator and two of the four had a greater than 0.5 pixel difference from the mean COR on some area of the FOV. This variation makes these collimators unacceptable for SPECT acquisition. Thus, initial acceptance testing of SPECT collimators should verify a uniform COR across the full FOV and collimators with a variability from the mean COR greater than 0.5 pixels should be rejected.

• Research Organization: Veterans Administration Medical Center, Seattle, WA (USA)
• OSTI ID: 7074444
• Journal Information: J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 29:8; ISSN JNMEA
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
CALIBRATION
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
CONTROL
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
ERRORS
IMAGES
MOTION
QUALITY CONTROL
ROTATION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY