학술논문
Study on Scattering Radiation Effects According to change of Exposure Field Size in Digital X-ray Imaging
이용수 39
- 영문명
- 발행기관
- 한국방사선학회
- 저자명
- 조수연 정아림 정봉재 강상식 박지군
- 간행물 정보
- 『한국방사선학회 학술대회 논문집』한국방사선학회 2017년 추계종합학술대회논문집, 98~98쪽, 전체 1쪽
- 주제분류
- 공학 > 기타공학
- 파일형태
- 발행일자
- 2017.11.10
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국문 초록
최근 방사선 촬영에 의한 질병진단이나 방사선 치료의 증대로 점차 방사선의 인체 조사 횟수가 증가하고 있으며, 이에 따른 환자 및 의료 직장인에 대한 불필요한 피폭을 감소시키기 위한 촬영 조건에 대한 최적화에 대한 관심도가 증가하고 있는 추세이다. 한편, 방사선 촬영 시 조사야 크기에 따라 산란방사선의 발생량이 달라지고, 이로 인해 영상의 화질 뿐만 아니라 환자 및 방사선사에 대한 피폭선량에 영향을 미치는 것으로 잘 알려져 있다. 따라서 진단 X선 영상 촬영 시 영상의 질을 향상시키면서 불필요한 인체 피폭을 저감시키기 위하여 최적화된 조사야 크기 설정이 중요하다. 이에 본 연구에서는 디지털 진단 X선 영상 획득 시 조사야의 면적이 영상의 질(quality)에 미치는 영향을 RMS, NPS 및 FSR 등의 분석을 통해 정량적으로 평가하고자 하였다.
디지털 영상 획득을 위한 검출기는 진단용 평판형 X선 검출기(FLAATZ 560, DR Tech Co, Korea)를 이용하였고, 조사야의 면적을 29×26 ㎠ ~ 41×38 ㎠의 범위에서 단계적으로 변화시켜 ANSI Chest phantom 영상을 획득하였다. FSR 분석은 진단용 X선 센서(XR-Sensor, IBA Co, Germany)을 사용하여 주 선속과 산란선량을 포함하는 총 선량을 구한 후 3mmPb을 팬텀 위에 위치시킨 후 산란선량을 25회 측정한 값을 평균하여 FSR 수식에 의하여 값을 도출하였다.
실험결과, RMS 값은 조사야가 증가할수록 산란선에 의한 노이즈가 증가하여 RMS가 증가하는 추세를 보이며, NPS 값은 조사야 크기 변화에 따라 NPS 값의 차이가 약 10% 이내이므로 조사야에 따른 노이즈 영향은 매우 작은 것으로 판단이 된다. 하지만 FSR 값은 조사야 크기가 phantom을 내에 있을 때 전방산란율이 급격히 증가하는 추세를 보이고 있다.
영문 초록
목차
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