Scatter correction algorithm without extra exposure for dual-energy digital mammography

Xi Chen; Xuanqin Mou; Hao Yan; Hengyong Yu; Lei Zhang

doi:10.1117/12.813466

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14 March 2009 Scatter correction algorithm without extra exposure for dual-energy digital mammography

Xi Chen, Xuanqin Mou, Hao Yan, Hengyong Yu, Lei Zhang

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Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725840 (2009) https://doi.org/10.1117/12.813466
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

X-ray scatter leads to erroneous calculations of dual-energy digital mammography (DEDM). The existing methods for scatter correction in DEDM are using anti-scatter grids or the pinhole-array interpolation method which is complicated and impractical. In this paper, a scatter correction algorithm for DEDM is developed based on the knowledge that scatter radiation in mammograms varies slowly and most pixels in mammograms are non-microcalcification pixels. The proposed algorithm only uses the information of low-energy (LE) and high-energy (HE) images. And it doesn't need anti-scatter grids, lead sheet and extra exposures. Our results show that the proposed scatter correction algorithm is effective. When using the simple least-squares fit and linear interpolation, the scatter to primary ratio (SPR) can be decreased from ~33.4% to ~2.8% for LE image and from ~26.2% to ~0.8% for HE image. Applying scatter correction to LE and HE images, the resultant background signal in the DE (dual-energy) calcification image can be reduced significantly.

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Xi Chen, Xuanqin Mou, Hao Yan, Hengyong Yu, and Lei Zhang "Scatter correction algorithm without extra exposure for dual-energy digital mammography", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725840 (14 March 2009); https://doi.org/10.1117/12.813466

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