Phase contrast digital mammography using molybdenum x-ray: clinical implications in detectability improvement

Matthew T. Freedman M.D.; Shih-Chung Benedict Lo; Chika Honda; Erini Makariou M.D.; Gale Sisney M.D.; Edward Pien M.D.; Hiromu Ohara; Akira Ishisaka; Fumio Shimada

doi:10.1117/12.480366

5 June 2003 Phase contrast digital mammography using molybdenum x-ray: clinical implications in detectability improvement

Matthew T. Freedman M.D., Shih-Chung Benedict Lo, Chika Honda, Erini Makariou M.D., Gale Sisney M.D., Edward Pien M.D., Hiromu Ohara, Akira Ishisaka, Fumio Shimada

Author Affiliations +

Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003) https://doi.org/10.1117/12.480366
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

We have applied phase imaging on digital mammography to investigate adequate contrast of printed images for digital phase contrast mammography using a practical molybdenum X-ray tube. Phase contrast mammography procedures were performed with defined air gap (e.g., 0.6 m) configuration using customized mammography equipment and a computed radiography (CR) system. Magnified (x2) phase contrast images acquired with 0.0875mm per pixel were mapped onto the laser imager resolution at 0.04375mm per pixel for printing life-size object on wet processing silver halide recording film. For contact mammography of screen-film system, we used MinR2000 system as a baseline method. ACR 156 phantom printed images with contrasts of 2.8, 3.7, 4.9, 5.7 and 6.7 were evaluated by five radiologists. The ACR scores for the life-size image based on the 2 times magnified phase contrast image acquired by the computed radiography were higher than the scores of MinR2000 image, when the contrast of printed images for both methods was 3.7. The ACR scores were lower in the low contrast images (i.e., 2.8) than its higher contrast counterparts (i.e., >= 3.7) for all techniques used. The detectability improvement should be due to higher spatial resolution and lower noise in the phase contrast images.

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Matthew T. Freedman M.D., Shih-Chung Benedict Lo, Chika Honda, Erini Makariou M.D., Gale Sisney M.D., Edward Pien M.D., Hiromu Ohara, Akira Ishisaka, and Fumio Shimada "Phase contrast digital mammography using molybdenum x-ray: clinical implications in detectability improvement", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); https://doi.org/10.1117/12.480366

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