검색
검색 팝업 닫기

Ex) Article Title, Author, Keywords

Article

Original Article

Korean Journal of Medical Physics 2010; 21(3): 261-273

Published online September 25, 2010

Copyright © Korean Society of Medical Physics.

Signal and Noise Analysis of Indirect-Conversion Digital Radiography Detectors Using Linear-systems Transfer Theory

선형시스템 전달이론을 이용한 간접변환방식 디지털 래디오그라피 디텍터의 신호 및 잡음 분석

Seungman Yun*, Chang Hwy Lim*, Jong Chul Han*, Okla Joe*, Jung-Min Kim, Ho Kyung Kim*

윤승만*ㆍ임창휘*ㆍ한종철*ㆍ조옥라*ㆍ김정민ㆍ김호경*

*School of Mechanical Engineerig, Pusan National University, Busan, Department of Radiologic Science, Korea University, Seoul, Korea

*부산대학교 기계공학부, 고려대학교 방사선학과

Abstract

For the use of Indirect-conversion CMOS (complementary metal-oxide-semiconductor) detectors for digital x-ray radiography and their better designs, we have theoretically evaluated the spatial-frequency-dependent detective quantum efficiency (DQE) using the cascaded linear-systems transfer theory. In order to validate the developed model, the DQE was experimentally determined by the measured modulation-transfer function (MTF) and noise-power spectrum, and the estimated incident x-ray fluence under the mammography beam quality of W/Al. From the comparison between the theoretical and experimental DQEs, the overall tendencies were well agreed. Based on the developed model, we have investigated the DQEs values with respect to various design parameters of the CMOS x-ray detector such as phosphor quantum efficiency, Swank noise, photodiode quantum efficiency and the MTF of various scintillator screens. This theoretical approach is very useful tool for the understanding of the developed imaging systems as well as helpful for the better design or optimization for new development.

KeywordsDigital radiography, X-ray detector, Linear-systems transfer theory, MTF, NPS, DQE

Korean Society of Medical Physics

Vol.35 No.2
June 2024

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

Frequency: Quarterly

Current Issue   |   Archives

Stats or Metrics

Share this article on :

  • line