Collimator Selection for Ga-67 Imaging with the Anger Camera

Abstract

Gallium-67 images have generally suffered from poor quality because of difficulty in properly collimating the multiple photopeaks released by the radionuclide. A comparison of the spatial resolution and septal penetration characteristics of two collimators we currently use for Ga-67 imaging—with a scintillation camera system equipped with single photopeak analyzers—is presented. Results show that the camera performs best when a medium energy collimator is used with the system’s photopeak analyzer centered around the 93-keV photopeak of Ga-67.