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Proceedings Paper

Image noise sensitivity of dual-energy digital mammography for calcification imaging
Author(s): Xi Chen; Robert M. Nishikawa; Suk-tak Chan; Lei Zhang; Xuanqin Mou
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Paper Abstract

Dual-energy digital mammography (DEDM) can suppress the contrast between adipose and glandular tissues and generate dual-energy (DE) calcification signals. DE calcification signals are always influenced by many factors. Image noise is one of these factors. In this paper, the sensitivity of DE calcification signal to image noise was analyzed based on DEDM physical model. Image noise levels of two different commercially available digital mammography systems, GE Senographe Essential system and GE Senographe DS system, were measured. The mean noise was about 1.04% for Senographe Essential system, 1.42% for Senographe DS system at 28kVp/50mAs; and was 0.47% for Senographe Essential system, 0.79% for Senographe DS system at 48kVp/12.5mAs. Evaluations were performed by comparing RMS (Root-Mean-Square) of calcification signal fluctuations in background regions and CNR (Contrast-Noise-Ratio) of calcification signals in clusters when these two digital mammography systems were used. The results showed that image noise had a serious impact on DEDM calcification signals. If GE Senographe Essential system was used, calcification signal fluctuations were 200~300μm, and when calcification size is greater than 300μm, the probability of acquiring CNR≥3 is over 50%. If noise reduction techniques are used, the calcification threshold size of CNR≥3 can be lower.

Paper Details

Date Published: 16 March 2011
PDF: 8 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 796155 (16 March 2011); doi: 10.1117/12.877932
Show Author Affiliations
Xi Chen, Xi'an Jiaotong Univ. (China)
Robert M. Nishikawa, The Univ. of Chicago (United States)
Suk-tak Chan, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Lei Zhang, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Xuanqin Mou, Xi'an Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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