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Original Article

Korean Journal of Medical Physics 2008; 19(4): 219-226

Published online December 25, 2008

Copyright © Korean Society of Medical Physics.

Image Quality Evaluation of Digital X-Ray Detector Using Amorphous Selenium Layer and Amorphous Silicon TFT Array

비정질 셀레늄층과 비정질 실리콘TFT배열을 사용하는 디지털 X-선 검출기의 영상특성 평가

Chang-Won Kim*, Jeong Key Yoon*, Jong-Hyo Kim

김창원*ㆍ윤정기*ㆍ김종효

*DRTECH Corp, Department of Radiology, Seoul National University College of Medicine, Seoul, Korea

*(주)디알텍, 서울대학교 의과대학 영상의학교실

Abstract

In this study, we have conducted characterization of imaging performance for a flat panel digital X-ray detector using amorphous Selenium and a-Si TFT which was developed by the authors. The procedures for characterization were in concordance with internationally recommended standards such as IEC (international electrotechnical commission). The measures used for imaging performance characterization include response characteristic, modulation transfer function (MTF), detective quantum efficiency (DQE), noise power spectrum (NPS), and quantum limited performance. The measured DQEs at lowest and highest spatial frequencies were 40% and 25% respectively, which was superior to that of commercial products by overseas vendor. The MTF values were significantly superior to that of CR and indirect type DRs. The quantum limited performance showed the detector was limited by quantum noise at the entrance exposure level below 0.023 mR, which is sufficiently low for general X-ray examination.

KeywordsX-ray, Detector, TFT, Imaging performance, Characterization, DQE

Korean Society of Medical Physics

Vol.35 No.1
March 2024

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

Frequency: Quarterly

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