PubMed · 1042233
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T Morooshi, M Umayabashi. 1975. [Ultrasonic tomography].. https://pubmed.ncbi.nlm.nih.gov/1042233/
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The theory of image formation by simple summation of an object's projections, without further processing, is considered. Calculations are presented of the resultant image from a point, a rectangle, an annulus, and three rotationally symmetric objects. The general features of these images are discussed and it is postulated that for many objects of interest a limited compensation for edge unsharpening would suffice to produce recognition of the objects.
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