A Dual Processing System for PET Data Handling

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Abstract
This paper describes the implementation of a dual processor system for Positron Emission Tomography (PET). Coincidence counts are collected from 2 rings of 64 bismuth germanate (BGO) detectors. The addresses of the detector pairs having coincident events are presented to a modified gamma camera interface that increments memory locations in the host computer. At the end of each part of the scan sequence the data are stored on disk for later reconstruction. After reconstruction the final images calibrated in Bq/cc are sent over a parallel link to the second computer where they are stored on a large disk. A master scan directory is updated each time a new scan is received, archived on tape, or deleted. Programs to display the scans and combine them with data collected from blood samples to allow computation of blood flow and regional metabolism can be run by several users on the second computer.

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