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Reduction of the Effects of Scattered Radiation on a Sodium Iodide Imaging System

Hospital of The University of Pennsylvania, Philadelphia, Pennsylvania

Correspondence: For reprints contact: Peter Bloch, Dept. of Radiology, University of Pennsylvania, 3400 Spruce St., Philadelphia, Pa. 19104.

ABSTRACT

Because of apparent widening of the photopeak in the detection of low-energy gamma rays by sodium iodide crystals, Compton-scattered phantoms are also recorded in the photopeak window setting of the pulse-height analyzer. The resulting degradation of the image obtained can be appreciably reduced. The technique consists of measuring and subtracting the number of events recorded in the Compton energy interval 91–102 keV from the number of events simultaneously recorded under the photopeak 125–170 keV. This relatively simple technique requires two single-channel analyzers and can be incorporated readily in rectilinear scanners and stationary imaging devices.