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Proceedings Paper

Feasibility study of CMOS detectors for mammography
Author(s): Jong Chul Han; Seungman Yun; Chang Hwy Lim; Tae Woo Kim; Ho Kyung Kim
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Paper Abstract

We investigated the potential use of CMOS (complementary metal-oxide-semiconductor) imaging detectors with a pixel pitch of 48 μm for mammography. Fundamental imaging characteristics were evaluated in terms of modulation-transfer function (MTF), noise-power spectrum (NPS), and detective quantum efficiency (DQE). The magnitudes of various image noise sources, such as optical photons, direct x rays unattenuated and scattered x rays from the scintillator, and additive electronic noise, were measured and analyzed. For the analysis of the measurement results, we applied a model describing the signal and noise transfer based on the cascaded linear-systems approach. The direct x-ray was very harmful to the detector noise performance with white noise characteristics in the spatial frequency domain, and which significantly degraded the spatial-frequency-dependent DQE at higher frequencies. Although the use of a fiber-optic plate (FOP) reduces the detector sensitivity and the MTF performance, it enhances the DQE performance by preventing the direct x-ray photons from the absorption within the photodiode array.

Paper Details

Date Published: 14 March 2009
PDF: 10 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583I (14 March 2009); doi: 10.1117/12.811538
Show Author Affiliations
Jong Chul Han, Pusan National Univ. (Korea, Republic of)
Seungman Yun, Pusan National Univ. (Korea, Republic of)
Chang Hwy Lim, Pusan National Univ. (Korea, Republic of)
Tae Woo Kim, Vatech Co., Ltd. (Korea, Republic of)
Ho Kyung Kim, Pusan National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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