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논문 기본 정보

자료유형
학술저널
저자정보
정운찬 (삼성서울병원 영상의학과) 주영철 (삼성서울병원)
저널정보
대한방사선과학회 방사선기술과학 방사선기술과학 제44권 제2호
발행연도
2021.1
수록면
85 - 90 (6page)

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초록· 키워드

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The purpose of this study is to consider usefulness of using AEC mode and importance of patient center loca tion in L-spine lateral radiography by comparing dose and image quality according to the change of patient center loca tion with using AEC mode or not. In this study, guide wire is attached to the human body phantom’s lumbar spine and the lead ruler is attached to the bottom of the wall detector to find out center location in detector. ESD, ㎃s, and EI were selected as dose factors, and image quality was compared through SNR. With the lumbar spine located center of the detector, dose factors and image quality were compared according to using AEC mode or not. Afterwards, phantom moved 4 ㎝ and 8 ㎝ back and forth and compared dose factors and image quality. The exposure parameters were 85 ㎸p, 320 ㎃, x-ray field size 10×17 inch, and the distance between the center X-ray and the detector was fixed at 100 ㎝. The center X-ray was perpendicular to the fourth lumbar spine and the only bottom AEC chamber was used. All data were analyzed by independent t-test and ANOVA. As a result of this study, with AEC when the center is matched, ESD was 1.31±0.01 m㏉, without AEC was 2.12±0.01 m㏉. SNR was shown to be 22.81±1.83, and 23.44±1.87 respectively. When the phantom’s center moves 4 ㎝, 8 ㎝ forward, and 4 ㎝, 8 ㎝ backward, ESD were 1.09±0.004 m㏉, 0.32±0.003 m㏉, 1.19±0.017 m㏉, 1.11±0.006 m㏉ respectively, SNR were 18.29±0.60 ㏈, 11.11±0.22 ㏈, 18.98±0.80 ㏈, 17.71±0.82 ㏈. Using AEC in L-spine lateral radiography reduced ESD by 38%, EI by 35%, and ㎃s by 38%, without any difference in SNR(p<0.05). When the phantom’s center moves 4 ㎝, 8 ㎝ forward, and 4 ㎝, 8 ㎝ backward, ESD was decreasing each 16%, 75%, 9%, 15%, EI was decreasing each 14%, 77%, 15%, 20%, mAs was decreasing each 15% 75% 9%, 15%. SNR was decreasing each 19%, 51%, 17%, 22%.

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