Implications of using high contrast mammography X-ray film-screen combinations.

The objective of this study was to determine the implications of using Fuji AD-M and Kodak min-R 2000, two high contrast X-ray film types developed for mammography. Evaluation of the Fuji AD-M film was divided into two parts. The first part was a contralateral comparison between mammograms using Fuji AD-M and Fuji UM-MA HC film-screen combinations. Fuji AD-M contrast was about 25% higher than that of Fuji UM-MA HC. The effect of increased contrast on image quality was investigated by visually grading the quality of information in different parts of each mammogram. Fuji AD-M film was generally judged to be better for overall diagnosis. However, 2.3% of mammograms produced using Fuji AD-M film were not acceptable and might have led to a technical recall of the patient. In the second part of this study, sets of mammograms from women attending mobile screening units were reviewed. One unit used Fuji AD-M film and the other used Kodak min-R 2000 film. Both samples of mammograms were digitized and analysed. The average film gradients between an optical density (OD) of 0.25 and 2.00 above base plus fog were 4.38 for Fuji AD-M film and 3.77 for Kodak min-R 2000 film. The main breast regions of the mammograms were judged to be satisfactorily displayed when breast tissues were above ODs of approximately 0.6 for Fuji AD-M film and 0.8 for Kodak min-R 2000 film.