Abstract
The normal semi-quantitative method of assessing the resolution of a gamma camera system is to use either a standard Anger pie phantom (Anger, 1973) or a lead bar phantom placed on the camera's collimator face and illuminated by an extended plane source of radioactivity. Additional information regarding resolution at depth may be obtained by the tedious procedure of interposing various thicknesses of absorber between phantom and collimator, as recommended by the Hospital Physicists' Association (HPA, 1978). This method is open to abuse since gamma camera and photographic settings can be repeatedly changed to ensure optimum results at the various depths—a procedure not applicable in normal clinical practice where in effect all depths are viewed simultaneously.
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