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The problem of discrimination in mammography. Arguments for using a biological test object

Division of Physics, Institute of Cancer Research, and Royal Marsden Hospital, Fulham Road, London, S.W.3

Rosemary R. Millis, M.R.C. Path.

Breast Unit and Department of Pathology, Royal Marsden Hospital, Fulham Road, London, S.W.3

A specimen of breast tissue containing a carcinoma with multiple calcifications was used as a test object and examined by a range of mammographic techniques. The images were compared with a photograph of the actual specimen which was cleared and stained for calcium salts. A quantitative method of evaluating the discriminating ability of each technique is described and used to compare these images. Xeroradiography and Kodak Crystallex film clearly excelled other imaging methods. The value of using a biological test object is discussed.

^* Present address: Department of Diagnostic Radiology, St. Thomas's Hospital, London SE1 7EH.

Present address: Hedley Atkins Unit, New Cross Hospital, London S.E.14.

Received for publication December 1, 1975.