학술논문
Impact of Object Thickness on Scattered Radiation Distribution in Diagnostic Radiology
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- 영문명
- 발행기관
- 한국방사선학회
- 저자명
- 양승우 전제훈 박주영 박지군 노시철 강상식
- 간행물 정보
- 『한국방사선학회 학술대회 논문집』한국방사선학회 2017년 추계종합학술대회논문집, 47~47쪽, 전체 1쪽
- 주제분류
- 공학 > 기타공학
- 파일형태
- 발행일자
- 2017.11.10
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국문 초록
현재까지 X선은 의료진단 영역에서 일반촬영, 투시조영 및 전산화단층활영 등의 다양한 진단장치에 적용되어져 왔다. 최근에는 종래의 필름방식의 아날로그 영상화 기술에서 대부분 디지털영상장치의 개발로 디지털 X선 영상을 얻고 있다. 한편, 디지털 영상 촬영장치에서 획득한 디지털 영상은 촬영조건에 따른 영상의 화질에 미치는 영향이 기존의 필름과는 다르기 때문에 이에 대한 정량적 분석이 요구되고 있는 실정이다. 특히 환자의 두께에 따른 산란선은 영상에서 화질의 저하와 환자에 대한 피폭선량을 증가시키는 중요한 요소로서 이에 대한 정량적 평가가 필요하다.
이에 본 연구에서는 산란선이 DR(Digital Radiography)방식 영상에 미치는 영향을 정량적으로 분석하고자 하였다. 기존 병원에서 검사빈도가 높은 흉부를 조직등가물질로 제작한 팬텀에서 두께가 증가할 경우 발생하는 전방산란선량율(FSR; Foward Scattering Rate)을 측정하였으며, 획득된 X선 영상의 화질을 정량적으로 분석하고자 RMS, NPS 값을 산출하였다.
팬텀은 조직등가물질로 미국표준협회 (ANSI; American National Srandards Institute) 흉부 팬텀을 사용하였으며, 1인치씩 팬텀의 두께를 두껍게 하여 실험을 진행하였다. FSR은 모의실험과 실제로 팬텀을 준비하여 팬텀의 두께가 증가할 때 발생되는 전방산란선량을 측정하여 산출하였다. 모의실험에는 MCNPX를 사용하여 ANSI 흉부팬텀을 모사하였고, 실제 측정에서는 팬텀상단에 3mmPb를 위치시키지 않았을 때의 주선속과 위치시켰을때의 주선속을 차폐한 선속을 구하여 FSR을 산출하였다. 획득된 X선 영상을 바탕으로 관심영역(ROI; Region of Interest)을 516×516 픽셀 배열로 설정하고 RMS와 NPS를 산출하였다.
측정결과, FSR과 NPS는 팬텀의 두께가 증가할수록 증가하는 반면, RMS 값은 감소하는 경향을 보였다.
영문 초록
목차
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