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Original Article

Korean Journal of Medical Physics 2010; 21(3): 239-245

Published online September 25, 2010

Copyright © Korean Society of Medical Physics.

Comparison Study of Image Quality of Direct and Indirect Conversion Digital Mammography System

직접 및 간접변환 방식의 디지털 유방 X선 촬영시스템의 영상화질 비교 연구

Hye-Suk Park*, Yuna Oh, Hee-Jeong Jo, Sang Tae Kim§, Yu-Na Choi*, Hee-Joung Kim*

박혜숙*ㆍ오유나ㆍ조희정ㆍ김상태§ㆍ최유나*ㆍ김희중*

*Department of Radiological Science, College of Health Science and Research Institute of Health Science, Yonsei University, Wonju, Department of Radiology, Seoul National University Bundang Hospital, Seongnam, §Department of Radiation Science & Technology, Chonbuk National University, Jeonju, Korea

연세대학교 보건과학대학 *방사선학과, 보건과학연구소, 분당서울대학교병원 영상의학과, §전북대학교 방사선과학기술학과

Abstract

The purpose of this study is to comprehensively compare and evaluate the characteristics of image quality for digital mammography systems which use a direct and indirect conversion detector. Three key metrics of image quality were evaluated for the direct and indirect conversion detector, the modulation transfer function (MTF), normalized noise power spectrum (NNPS), and detective quantum efficiency (DQE), which describe the resolution, noise, and signal to noise performance, respectively. DQE was calculated by using a edge phantom for MTF determination according to IEC 62220-1-2 regulation. The contrast to noise ratio (CNR) was evaluated according to guidelines offered by the Korean Institute for Accreditation of Medical Image (KIAMI). As a result, the higher MTF and DQE was measured with direct conversion detector compared to indirect conversion detector all over spatial frequency. When the average glandular dose (AGD) was the same, direct conversion detector showed higher CNR value. The direct conversion detector which has higher DQE value all over spatial frequency would provide the potential benefits for both improved image quality and lower patient dose in digital mammography system.

KeywordsDigital mammography system, Direct conversion detector, Indirect conversion detector, MTF, NNPS, DQE

Korean Society of Medical Physics

Vol.33 No.4
December, 2022

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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