Quantitative Assessment of Field Uniformity for Gamma Cameras

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Abstract
Objective criteria for judging the uniformity of field floods are developed and the effects of the energy window and scatter material on uniformity are examined. There is a highly significant correlation (p = 0.99) between a 14% difference in average count among adjacent photomultiplier tube regions and observer detection of detuned areas. Similarly, a 10% average count difference is not significantly recognized asa nonuniform area. Results indicate that there is a complex interaction between uniformity, energy window (15–30% symmetrical) and 0–7.6 cm of tissue-equivalent scatter medium interposed between the flood source and the collimator. Quantitation of the flood should be performed to indicate which regions need retuning.

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