Study of signal-to-noise ratio in digital mammography

Yuri Kato; Naotoshi Fujita; Yoshie Kodera

doi:10.1117/12.811487

13 March 2009 Study of signal-to-noise ratio in digital mammography

Yuri Kato, Naotoshi Fujita, Yoshie Kodera

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72582Z (2009) https://doi.org/10.1117/12.811487
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Mammography techniques have recently advanced from those using analog systems (the screen-film system) to those using digital systems; for example, computed radiography (CR) and flat-panel detectors (FPDs) are nowadays used in mammography. Further, phase contrast mammography (PCM)-a digital technique by which images with a magnification of 1.75× can be obtained-is now available in the market. We studied the effect of the air gap in PCM and evaluated the effectiveness of an antiscatter x-ray grid in conventional mammography (CM) by measuring the scatter fraction ratio (SFR) and relative signal-to-noise ratio (rSNR) and comparing them between PCM and the digital CM. The results indicated that the SFRs for the CM images obtained with a grid were the lowest and that these ratios were almost the same as those for the PCM images. In contrast, the rSNRs for the PCM images were the highest, which means that the scattering of x-rays was sufficiently reduced by the air gap without the loss of primary x-rays.

Citation Download Citation

Yuri Kato, Naotoshi Fujita, and Yoshie Kodera "Study of signal-to-noise ratio in digital mammography", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72582Z (13 March 2009); https://doi.org/10.1117/12.811487

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