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The Index of Resolution When Septal Penetration is Important

University of California, Los Angeles, California

Correspondence: For reprints contact: P. Spiegler, University of California, the Center for the Health Sciences, Dept. of Radiology, Los Angeles, Calif. 90024.

ABSTRACT

The index of resolution of focused collimators is redefined in terms of the second central moment. This index of resolution depends on the energy of the gamma ray. For low-energy gamma rays, it reduces to the FWHM of the linespread function.