Computer Correction of Camera Nonidealities in Gamma Ray Imaging

Digital methods to correct for imperfections in gamma ray cameras are reviewed. The two principal problems currently addressed are nonlinearities in the analog position signals, and variations with position in the magnitude of the energy signal. As an example of real-time processing to correct for these imperfections, the operation of the Medical Data Systems image preprocessor is outlined. A new technique is described that leads to the establishment of an "adaptive" energy window to further improve image uniformity.