| Abstract | The IAEA initiated the Programme in 1970. The studies at present being carried out under the Programme are intercomparisons of data-processing techniques for image enhancement, particularly as regards their relative merits in improving the detectability of small lesions. For an initial intercomparison, simulated scans were generated by computer from a methematical simulation of a simple phantom in the form of a paraboloid of rotation. The resulting data were recorded and reproduced on magnetic tape and sent to 18 participating institutions. Twenty・four variants of the phantom, each with a different pattern of lesions, were generated. The phantom was divided into four quadrants, each of which containd either one lesion, either hot or cold, being of random chi-square significance (0-30 s. d.) and randomly located, or none. |
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