Uniformity testing of a dual-head gamma camera with a nearby point source
Date
1995
Authors
Wasserman H.J.
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Journal ISSN
Volume Title
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Abstract
Limitations to head movement of dual-head gamma cameras may prevent proper geometry being attained for testing of intrinsic uniformity with a point source. When a point source is placed too near to the uncollimated crystal, the detected flood image will be non-uniform due to the inverse square law effect, oblique incidence, and increased path length traversed through the crystal by oblique rays. A formula has been deduced for constructing a map to correct for these effects. The general formula has been applied to a particular dual-head camera in which a point source has been placed on the face of one head, at 65.5 cm from the opposite uncollimated crystal. It is shown that division of the non-uniform image, acquired with this geometry, by the correction map yields a uniform image which may be used for routine investigation of the uniformity characteristics of the camera.
Description
Keywords
article, controlled study, quality control, scintillation camera, Gamma Cameras, Human, Mathematics, Models, Theoretical, Photons, Reproducibility of Results, Technetium
Citation
Nuclear Medicine Communications
16
6
16
6