Count Rate Distortions Introduced in Gamma Camera Data by a Nuclear Medical Image Analysis System
A well established Nuclear Medicine Imaging Computer has been found to interfere with the data presented to it by a gamma camera at high count-rates. The form of the interference found was highly unexpected, previously unreported, and occurred at count-rates that overlapped the clinically relevant range. Explanations for this behaviour were derived by examining the response of the system to a controlled range of count-rate data. From these observations the main features limiting the performance of the system were deduced. These included data acquisition into a remote memory of limited size (rather than core) and relatively slow software operation for moving data from the remote memory to core and processing it there. The performance of the system has been greatly improved by increasing the speed of the software operations and increasing the size of the remote memory.
KeywordsGamma Camera Relevant Range Remote Memory Output Count Anger Camera
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