CODED-APERTURE IMAGING USING IMPERFECT DETECTOR SYSTEMS

The imaging properties of a gamma-ray telescope which employs a coded aperture in conjunction with a modular detection plane has been invest igated. Gaps in the detection plane, which arise as a consequence of t he design of the position sensitive detector used, produce artifacts i n the deconvolved images which reduce the signal to noise ratio for th e detection of point sources. The application of an iterative image pr ocessing algorithm is shown to restore the image quality to that expec ted from an ideal detector. The efficiency of image processing has ena bled its subsequent application to a general coded aperture system in order to gain a significant improvement in the field of view without c ompromising the angular resolution.