This report examines two methods of enhancing a photographic image and applies them to duplicating mammographs. Subtractive unsharp masking, one such method, is a photo-optical edge enhancement technique. The degree of unsharpness is controlled by interspacing between the mammograph and a receiving film while exposing. The other method is optimizing the combination of masking film contrast and duplicating film contrast. Three levels of unsharpness, two levels of mask contrast and two levels of duplicating film contrast were tested. The common objective of this project and mammography in general involves the recognition and diagnosis of breast cancer. Specifically, the experimental objective is to increase the detectability of breast tumors and calcium deposits caused by cancer relative to an original mammograph. Individual examinations of 36 samples by six radiologists provided data enabling subjective and statistical conclusions to be made. Tumor and calcium detectability were rated relative to an original mammograph. Respectively, results showed that 54% and 96% of the samples observed were rated superior in diagnostic quality

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School of Photographic Arts and Sciences (CIAS)


Todd, Hollis


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