The dependency of pixel size on calcification reproducibility in digital mammography

Takao Kuwabara; Nobuyuki Iwasaki; Katsutoshi Yamane; Tetsuya Kojima; Kimitake Fukushima; Toshitaka Agano

doi:10.1117/12.706744

20 March 2007 The dependency of pixel size on calcification reproducibility in digital mammography

Takao Kuwabara, Nobuyuki Iwasaki, Katsutoshi Yamane, Tetsuya Kojima, Kimitake Fukushima, Toshitaka Agano

Author Affiliations +

Proceedings Volume 6515, Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment; 65150G (2007) https://doi.org/10.1117/12.706744
Event: Medical Imaging, 2007, San Diego, CA, United States

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.

Citation Download Citation

Takao Kuwabara, Nobuyuki Iwasaki, Katsutoshi Yamane, Tetsuya Kojima, Kimitake Fukushima, and Toshitaka Agano "The dependency of pixel size on calcification reproducibility in digital mammography", Proc. SPIE 6515, Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment, 65150G (20 March 2007); https://doi.org/10.1117/12.706744

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