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Proceedings Paper

Characterization of scatter radiation of a breast phantom on Siemens prototype FFDM with and without an anti-scatter grid
Author(s): Jessie Q. Xia; Joseph Y. Lo; Carey E. Floyd Jr.
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Paper Abstract

In this study, the beam stop technique was applied to obtain the scatter fraction values for an anthropomorphic breast phantom on a flat-panel full field mammography system. The phantom was equivalent to a compressed breast of 5 cm thickness with 50% glandular tissue content. The images were acquired at 28kVp with Mo/Mo target/filter combination and multiple mAs values with or without an anti-scatter grid. The one-dimensional and two-dimensional scatter fraction profiles of the breast phantom without a grid were plotted. The effect of mAs on scatter fraction calculation was investigated. It was found that in order to get a reliable measurement of scatter fraction, the mAs had to be above about 40mAs without a grid and 160mAs with a grid. In addition, the SNR values at 28kVp and 80mAs (AEC level for the phantom using the same imaging technique on a screen/film system) with and without a grid were compared with each other. The SNR with a grid was slightly smaller than that without a grid. The SNR improvement factor (KSNR ) defined as the ratio of SNR without the grid to SNR with the grid was 0.976. The grid had the primary and scatter transmissions of 73% and 13% respectively.

Paper Details

Date Published: 20 April 2005
PDF: 7 pages
Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.595960
Show Author Affiliations
Jessie Q. Xia, Duke Univ. (United States)
Duke Univ. Medical Ctr. (United States)
Joseph Y. Lo, Duke Univ. (United States)
Duke Univ. Medical Ctr. (United States)
Carey E. Floyd Jr., Duke Univ. (United States)
Duke Univ. Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 5745:
Medical Imaging 2005: Physics of Medical Imaging
Michael J. Flynn, Editor(s)

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