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A survey of various image processing techniques as applied to images in nuclear medicine is presented. These have been classified as procedures to improve detectability, to correct for distortion, to compress, and to aid automation. On evaluation, rather disappointing results fromconventional image'enhancing' techniques have been found. On the other hand, the use of image 'transforming' procedures is highly satisfactory and of increasing importance in this field. This survey has been prepared for the image processor who knows little of nuclear medicine, or the nuclear medicine practitioner who knows little of image processing.