흉부 CT검사시 AEC Program 적용에 의한 선량감소효과에 관한 연구

• 영문명: Dose Reduction Effect with Automatic Exposure Control Program in Chest CT
• 발행기관: 대한CT영상기술학회
• 저자명: 이대규(Dae kyoo Lee) 남윤철(Yoon Chul Nam) 김문찬(Moon Chan Kim)
• 간행물 정보: 『대한CT영상기술학회지』대한전산화단층기술학회지 제8권 제1호, 15~23쪽, 전체 9쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2006.04.30

영문 초록

Purpose The purpose of this study is to check how much a radiation dose of the thoraxis reduced when using AEC technique in CT examination, and to apply the program properly to clinical cases. Materials and Methods We measured organ doses of thyroid, upper chest, mid chest, lower chest, breast, liver when conducting a test by using Brilliance CT made by Philips, instead of AEC program, and compared the radiation dose reduction effect of each organ by measuring the effect shown when using D-DOM (a method of controlling a tube current according to the thickness of a subject for photography toward X-Y axis of a revolving angle of a tube) among AEC programs, and Z-DOM(a method of controlling a tube current according to the thickness of Z-axis position). Results The comparison between dose with AEC program and dose without AEC program in chest routine CT were as follows, 1. The thyroid dose using D-DOM and Z-DOM wasreduced 23.9% and 49.5% respectively rather than dose of non-AEC program. 2. The upper chest dose using D-DOM and Z-DOM was reduced 18.3% and 17.8% respectively rather than dose of non-AEC program. and The mid. chestdose using D-DOM and Z-DOM was reduced 15.2% and 12.7% respectively rather than dose of non-AEC program. and The lower chest dose using D-DOM and Z-DOM was reduced 5.8% and 22.4% respectively rather than dose of non-AEC program. 3. The breast dose using D-DOM and Z-DOM was reduced 10.7% and 7.5% respectively rather than dose of non-AEC program. 4. The liver dose using D-DOM and Z-DOM was reduced 20.3% and 26.4% respectively rather than dose of non-AEC program. 5. It was proven that as for the radiation dose reduction effect by D-DOM, the control of a tube current was mostly performed in the asymmetrical part such as shoulder when comparing upper chest (18.3%), mid. Chest(15.2%), and lower chest(5.8%). 6. Thyroid, Lower chest showed a greater radiation dose reduction effect when using Z-DOM rather than D-DOM. Conclusion The radiation dose reduction effect in each organ was proven higher by far when using AEC program. In particular, D-DOM demonstrated an excellent radiation dose reduction effect in the part that showed a great difference of thickness between AP and Lateral(ex. shoulder). Z-DOM displayed an outstanding effect in the neck part.

목차

Abstract

Ⅰ. 목적

Ⅱ. 대상 및 방법

Ⅲ. 결과

Ⅳ. 고찰

Ⅴ. 결론

참고문헌

키워드

organ dose automatic exposure control dose modulation automatic current selection ECG DOM