Dose Modulation 기법에서 Noise Index 변화에 따른 선량 및 영상 Noise의 변화

• 영문명: Variation of Dose and Image Noise by Change of Noise Index
• 발행기관: 대한CT영상기술학회
• 저자명: 김정훈(Jung Hoon Kim) 길미경(Mi Kyeong Kil) 김기홍(Ki Hong Kim)
• 간행물 정보: 『대한CT영상기술학회지』대한전산화단층기술학회지 제11권 제1호, 114~119쪽, 전체 6쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2009.09.30

영문 초록

Purpose To evaluate the variation of exposure dose and image noise by change of noise index in a study of CT. Materials and methods 64 MDCT, Rando phantom, and photoluminescence dosimeter(PLD) were used for this study. We changed the noise index from 2 to 70 in phantom study with the same condition of abdominal CT, and then evaluated the variation of exposure dose(dose length product and organ dose) and value of image noise according to the noise index. Results In the variation of exposure dose, value of dose length product(DLP) was decreased to 33.3%, 35.5%, 30.3%, 26.2%, 24.3%, in changing from noise index 6 toward 8, 8 toward 10, 10 toward 12, 12 toward 14, 14 toward 16, respectively, and value of organ dose in liver was also decreased to 39.8%, 38.4%, 27.6%, 19.7%, 28.9%, in changing from noise index 6 toward 8, 8 toward 10, 10 toward 12, 12 toward 14, 14 toward 16, respectively. In the variation of image noise, the mean value and standard deviation was 7.01±1.21, 7.04±1.21, 11.29±1.18, 13.37±1.04, 15.66±1.13, 18.30±1.60, 20.19±1.49, in noise index 4, 6, 8, 10, 12, 14, 16, 18, respectively. Conclusion The variation of exposure dose was shown irregularly according to regular changing of noise index, and the most variation was between noise index 6 and 16 used in clinic mainly. The value of image noise was slightly higher than that of setting noise index in all measured range, the value of that between noise index 2 and 14 was constantly shown standard deviation with 1.5 and less.

목차

Abstract

Ⅰ. 목적

Ⅱ. 대상 및 방법

Ⅲ. 결과

Ⅳ. 고찰

Ⅴ. 결론

참고문헌

키워드

noise index image noise exposure dose