Estimation of mammary gland composition using CdTe series detector developed for photon-counting mammography

Akiko Ihori; Chizuru Okamoto; Tsutomu Yamakawa; Shuichiro Yamamoto; Masahiro Okada; Ai Nakajima; Misa Kato; Yoshie Kodera

doi:10.1117/12.2216378

29 March 2016 Estimation of mammary gland composition using CdTe series detector developed for photon-counting mammography

Akiko Ihori, Chizuru Okamoto, Tsutomu Yamakawa, Shuichiro Yamamoto, Masahiro Okada, Ai Nakajima, Misa Kato, Yoshie Kodera

Author Affiliations +

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97832F (2016) https://doi.org/10.1117/12.2216378
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Energy resolved photon-counting mammography is a new technology, which counts the number of photons that passes through an object, and presents it as a pixel value in an image of the object. Silicon semiconductor detectors are currently used in commercial mammography. However, the disadvantage of silicon is the low absorption efficiency for high X-ray energies. A cadmium telluride (CdTe) series detector has a high absorption efficiency over a wide energy range. In this study, we proposed a method to estimate the composition of the mammary gland using a CdTe series detector as a photon-counting detector. The fact that the detection rate of breast cancer in mammography is affected by mammary gland composition is now widely accepted. Assessment of composition of the mammary gland has important implications. An important advantage of our proposed technique is its ability to discriminate photons using three energy bins. We designed the CdTe series detector system using the MATLAB simulation software. The phantom contains nine regions with the ratio of glandular tissue and adipose varying in increments of 10%. The attenuation coefficient for each bin’s energy was calculated from the number of input and output photons possessed by each. The evaluation results obtained by plotting the attenuation coefficient μ in a three-dimensional (3D) scatter plot show that the plots had a regular composition order congruent with that of the mammary gland. Consequently, we believe that our proposed method can be used to estimate the composition of the mammary gland.

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Akiko Ihori, Chizuru Okamoto, Tsutomu Yamakawa, Shuichiro Yamamoto, Masahiro Okada, Ai Nakajima, Misa Kato, and Yoshie Kodera "Estimation of mammary gland composition using CdTe series detector developed for photon-counting mammography", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97832F (29 March 2016); https://doi.org/10.1117/12.2216378

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KEYWORDS

Mammary gland

Mammography

Photons

Signal attenuation

Photodetectors

Breast

Tissues

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