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An Adjustable Zoom-Mode Gain Control for Computerized Gamma-Camera Systems

SUNY Upstate Medical Center, Syracuse, New York

Correspondence: For reprints contact: Robert L. Richardson, PhD, Div. of Nuclear Medicine, SUNY Upstate Medical Ctr., Syracuse, NY 13210.

ABSTRACT

Many nuclear medicine departments use a digital computer to process scintillation-camera images. For optimal use of the computer, there should be a means to amplify the position signals of each scintillation event by an appropriate amount before their conversion to digital form. What is needed is a series of calibrated gains from which the best value may be chosen. Many systems now in use do not provide such a selection. The circuitry described here provides an inexpensive solution to this problem. It may be inserted between the camera and the computer's analog-to-digital converters to provide the desired amplification. No internal modification of the computer or the camera is required.