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Proceedings Paper

The dependency of pixel size on calcification reproducibility in digital mammography
Author(s): Takao Kuwabara; Nobuyuki Iwasaki; Katsutoshi Yamane; Tetsuya Kojima; Kimitake Fukushima; Toshitaka Agano
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Paper Abstract

The purpose of this study is to determine the relative effect of MTF, DQE, and pixel size on the shape of microcalcifications in mammography. Two original images were obtained by a) scanning the film that accompanies an RMI-156 phantom at a resolution of 25μm per pixel, b) creating an image with various shapes on a computer. Simulated images were then obtained by changing MTF, adding noise to simulate DQE effects, and changing the resolution of the original images. These images were visually evaluated to determine the recognition of the shape. In the evaluation of 400μm microcalcifications on the RMI-156 phantom, we found that shape recognition is maintained with a pixel size of 50μm or less regardless of MTF. However, at resolutions over 50μm, recognition was insufficient even when MTF was increased. Adding noise decreased visibility but did not affect shape recognition. The same results were obtained using computer-created shapes. The effect of pixel size on the recognition of the shape of microcalcifications was shown to be greater compared to MTF and DQE. It was also found that increasing MTF does not compensate for information lost because of enlarged pixel size.

Paper Details

Date Published: 20 March 2007
PDF: 12 pages
Proc. SPIE 6515, Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment, 65150G (20 March 2007); doi: 10.1117/12.706744
Show Author Affiliations
Takao Kuwabara, Fujifilm Corp. (Japan)
Nobuyuki Iwasaki, Fujifilm Corp. (Japan)
Katsutoshi Yamane, Fujifilm Corp. (Japan)
Tetsuya Kojima, Fujifilm Corp. (Japan)
Kimitake Fukushima, Fujifilm Corp. (Japan)
Toshitaka Agano, Fujifilm Corp. (Japan)

Published in SPIE Proceedings Vol. 6515:
Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment
Yulei Jiang; Berkman Sahiner, Editor(s)

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