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A Diverging Collimator for Gamma-Ray Imaging Cameras

Nuclear-Chicago Corporation, Des Plaines, Illinois

Correspondence: For reprints contact: G. Muehllehner, Research Dept., Nuclear-Chicago Corp., 333 E. Howard Ave., Des Plaines, Ill.

ABSTRACT

The diverging collimator gives a field of view that is large enough for practically all clinical applications. It can be used with existing 10-in.-diameter cameras, thus largely eliminating the need for larger-diameter detectors which would either be more costly or show poorer resolution and uniformity. The larger field of view is traded off for only a 20% loss in resolution and a reduction in efficiency which is proportional to the increase in the field of view. Uniformity of resolution and efficiency over the useful object plane is well within acceptable limits and has approximately the same magnitude as non-uniformities in the camera itself.

Note added in proof: After this article was written, a second diverging collimator was constructed which has a smaller field of view (13 in. at an object distance of 4 in.) but a higher resolution (improved by 20%). This collimator will be the subject of a later communication.