Abstract

Comparisons of various film–screen combinations for mammography have been reported in a series of communications, the most recent being one by Law and Kirkpatrick (1990). A further short series is reported here. The technique is unchanged from before. A phantom of “Barts” type (White & Tucker, 1980) with realistic details is used, and films are exposed in evacuated plastic envelopes to avoid any complicating influence from cassette design. The X-ray set used was a CGR 600T with molybdenum target and filter, but in this series all films were exposed at 28 kV with grid (rather than 25 kV, no grid, as before) in line with current clinical practice. All films were contact films at 60 cm focus–film distance (FFD) and were processed by a Dupont-T5A processor at 3.5 minutes, 35°C, and using Kodak chemistry.

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