학술논문
A Comparative Study on the Thyroid Dose According to the Change of Shielding Material Used in Neck Computed Tomography
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- 영문명
- 발행기관
- 한국방사선학회
- 저자명
- 고대호 류서용 이주환 문성호 박예진 강은보
- 간행물 정보
- 『한국방사선학회 학술대회 논문집』한국방사선학회 2017년 추계종합학술대회논문집, 67~67쪽, 전체 1쪽
- 주제분류
- 공학 > 기타공학
- 파일형태
- 발행일자
- 2017.11.10
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국문 초록
현재 Neck CT의 경우 Thyroid와 같은 표재성 장기의 피폭을 줄이기 위해 Bismuth 차폐체를 많이 사용하고 있다. 그러나 Bismuth 차폐체의 경우 표재성 장기 부근에서 선속 경화현상이 많이 발생하고 CT Number, Noise, Uniformity값의 변동이 심하게 나타난다. 본 연구에서는 주위에서 쉽게 구할 수 있고 가공성이 좋은 Aluminum과 Silicone을 이용하여 기존의 Bismuth 차폐체와 비교하여 차폐체로의 유용성을 알아보았다.
Bismuth와 차폐율이 비슷한 두께의 Aluminum 7.3mm와 Silicone 21.5mm를 제작하였다. 팬텀(RS-108T)의 Thyroid부근에 TLD(TLD-100)을 올려놓고 각각 5회씩 선량을 측정하였다. 그리고 Neck 영상의 Thyroid 부근의 axial영상과 AAPM팬텀의 영상에서 각각 CT Number와 Noise, Uniformity의 변화를 측정하여 비교하였다. 결과 Thyroid에 대한 차폐체별 선량 비교에서 Non-Shield에 비해 Bismuth 차폐체가 14%, Silicone 21.5mm 15%, Aluminum 7.3mm 13%가 감소되었다. AAPM팬텀 영상평가에서는 CT Number의 감약 계수 변동에서는 모두 합격기준을 만족하였으며, Noise의 측정에서는 모든 차폐체가 합격기준을 만족하지 못하였다. Uniformity 평가에서는 Bismuth차폐체는 불합격으로 Aluminum 7.3mm와 Silicone 21.5mm은 합격기준을 만족하였다.
연구결과 현재 임상에 사용되고 있는 고가의 Bismuth 차폐체와 비교하여 차폐율에서 Aluminum 7.3mm와 Silicone 21.5mm은 비슷한 차폐율을 나타냈으며, 팬텀 영상평가의 항목인 CT Number의 감약계수 변동, Noise, Uniformity의 비교 실험에서 Bismuth 차폐체보다 우수하게 나타났다. Aluminum과 Silicone을 이용하여 표재성 장기의 크기에 맞게 다양한 차폐체를 만들어 사용한다면 환자 선량을 감쇠시키는데 유용할 것으로 판단된다.
영문 초록
목차
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