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Proceedings Paper

Detection of microcalcifications and tumor tissue in mammography using a CdTe-series photon-counting detector
Author(s): Ai Nakajima; Akiko Ihori; Hiroko Nishide; Shuji Koyama; Tsutomu Yamakawa; Shuichiro Yamamoto; Masahiro Okada; Yoshie Kodera
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Paper Abstract

In this study, we proposed a method for detecting microcalcifications and tumor tissue using a cadmium telluride (CdTe) series linear detector. The CdTe series detector was used as an energy resolved photon-counting (hereafter referred to as the photon-counting) mammography detector. The CdTe series linear detector and two types of phantom were designed using a MATLAB simulation. Each phantom consisted of mammary gland and adipose tissue. One phantom contained microcalcifications and the other contained tumor tissue. We varied the size of these structures and the mammary gland composition. We divided the spectrum of an x-ray, which is transmitted to each phantom, into three energy bins and calculated the corresponding linear attenuation coefficients from the numbers of input and output photons. Subsequently, the absorption vector length that expresses the amount of absorption was calculated. When the material composition was different between objects, for example mammary gland and microcalcifications, the absorption vector length was also different. We compared each absorption vector length and tried to detect the microcalcifications and tumor tissue. However, as the size of microcalcifications and tumor tissue decreased and/or the mammary gland content rate increased, there was difficulty in distinguishing them. The microcalcifications and tumor tissue despite the reduction in size or increase in mammary gland content rate can be distinguished by increasing the x-ray dosage. Therefore, it is necessary to find a condition under which a low exposure dose is optimally balanced with high detection sensitivity. It is a new method to indicate the image using photon counting technology.

Paper Details

Date Published: 9 March 2017
PDF: 8 pages
Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 1013247 (9 March 2017); doi: 10.1117/12.2253576
Show Author Affiliations
Ai Nakajima, Nagoya Univ. (Japan)
Akiko Ihori, Nagoya Univ. (Japan)
Hiroko Nishide, Nagoya Univ. (Japan)
Gifu Univ. of Medical Science (Japan)
Shuji Koyama, Nagoya Univ. (Japan)
Tsutomu Yamakawa, JOB Corp. (Japan)
Shuichiro Yamamoto, JOB Corp. (Japan)
Masahiro Okada, JOB Corp. (Japan)
Yoshie Kodera, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 10132:
Medical Imaging 2017: Physics of Medical Imaging
Thomas G. Flohr; Joseph Y. Lo; Taly Gilat Schmidt, Editor(s)

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