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- W1991894312 abstract "To increase the detection performance of breast cancers in mammograms, we need to improve shape delineation ofmicro calcifications and tumors. We accomplished this by developing a direct-conversion mammography system with anoptical reading method and a new dual a-Se layer detector. The system achieved both small pixel size (50 micrometer)and a high Detective Quantum Efficiency (DQE) realized by 100 % of fill factor and noise reduction. We evaluatedimage quality performance and determined the best exposure conditions.We measured DQE and Modulation Transfer Function(MTF) according to the IEC62220-1-2. High DQE was maintainedat a low radiation dosage, indicating that the optical reading method accompanies low noises. Response of MTF wasmaintained at up to the Nyquist frequency of 10 cyc/mm, which corresponds to 50 micrometer pixel size.To determine the best exposure conditions, we measured Contrast to Noise Ratio (CNR) and visually evaluated imagesof a resected breast under conditions of MoMo, MoRh, and WRh. There were occasional disagreements between theexposure conditions for achieving the maximum CNR and those for the best image graded by the visual evaluation. Thiswas probably because CNR measurement does not measure effects of scattered X-ray. The images verified theimprovement in detection and delineation performance of micro calcifications and tumors." @default.
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- W1991894312 date "2009-02-26" @default.
- W1991894312 modified "2023-09-23" @default.
- W1991894312 title "Image quality evaluation of direct-conversion digital mammography system with new dual a-Se layer detector" @default.
- W1991894312 doi "https://doi.org/10.1117/12.811469" @default.
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