A New Method of Assessing the Performance of Scintillation Cameras and Scanners

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Abstract
Methods are described to make possible the comparisons of spatial resolution, sensitivity and distortion for stationary and moving detector scanners. The spatial resolution is measured in terms of the modulation transfer function derived from a simple line source. The sensitivity is expressed as counts per minute for a distributed source and this is combined with the modulation transfer function to give a figure of comparison. The distortion of a stationary detector scanner may be measured as "number "distortion which gives a differential linearity plot. These methods have been measuredto compare the performance of a scintillation camera using difference and ratio circuits and, as expected, the ratio cir -cuits exhibit improved performance characteristics.

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