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Original Article

Korean Journal of Medical Physics 2008; 19(4): 201-208

Published online December 25, 2008

Copyright © Korean Society of Medical Physics.

Objective and Quantitative Evaluation of Image Quality Using Fuzzy Integral: Phantom Study

퍼지적분을 이용한 영상품질의 객관적이고 정량적 평가: 팬톰 연구

Sung-Hyun Kim, Tae-Suk Suh, Bo-Young Choe, Hyoung-Koo Lee

김성현ㆍ서태석ㆍ최보영ㆍ이형구

Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Korea

가톨릭대학교 의과대학 의공학교실

Abstract

Physical evaluations provide the basis for an objective and quantitative analysis of the image quality. Nonetheless, there are limitations in using physical evaluations to judge the utility of the image quality if the observer's subjectivity plays a key role despite its imprecise and variable nature. This study proposes a new method for objective and quantitative evaluation of image quality to compensate for the demerits of both physical and subjective image quality and combine the merits of them. The images of chest phantom were acquired from four digital radiography systems on clinic sites. The physical image quality was derived from an image analysis algorithm in terms of the contrast-to-noise ratio (CNR) of the low-contrast objects in three regions (lung, heart, and diaphragm) of a digital chest phantom radiograph. For image analysis, various image processing techniques were used such as segmentation, and registration, etc. The subjective image quality was assessed by the ability of the human observer to detect low-contrast objects. Fuzzy integral was used to integrate them. The findings of this study showed that the physical evaluation did not agree with the subjective evaluation. The system with the better performance in physical measurement showed the worse result in subjective evaluation compared to the other system. The proposed protocol is an integral evaluation method of image quality, which includes the properties of both physical and subjective measurement. It may be used as a useful tool in image evaluation of various modalities.

KeywordsDigital radiography system, Physical evaluation, Subjective evaluation

Korean Society of Medical Physics

Vol.35 No.4
December 2024

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

Frequency: Quarterly

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