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Brain CT에서 차폐 재료 변화에 따른 수정체 선량 비교 연구

A Comparative Study on the Lens Dose According to the Change of Shielding Material Used in Brain Computed Tomography

  • 황인철 (고신대학교 보건환경학부) ;
  • 신운재 (동의과학대학교 방사선과) ;
  • 강은보 (동의과학대학교 방사선과)
  • Hwang, Incheol (Department of Health and Environment, Kosin University) ;
  • Shin, Woonjae (Department of Radiological Science, Dong-Eui Institute of Technology) ;
  • Gang, Eunbo (Department of Radiological Science, Dong-Eui Institute of Technology)
  • 투고 : 2014.12.01
  • 심사 : 2015.01.25
  • 발행 : 2015.01.30

초록

우리나라 국민의 연간 진단용 방사선 검사 건수는 매년 증가하고 있으며, 특히 의료 피폭의 절반이상을 차지하는 CT검사에 대한 각별한 주의가 요구된다. 본 연구에서는 현재 CT검사 중 가장 많은 부분을 차지하는 두부 CT에서 CT Number, Noise, Uniformity를 유지하면서 수정체 부분의 입사표면선량(ESD)을 줄이기 위해, 현재 사용하고 있는 Bismuth 차폐체와 Aluminum 6mm, Silicone 22mm를 비교 실험하였다. 실험 결과 IOML에 평행한 나선형 scan과 고식적 scan에서 차폐체를 사용하지 않을 때의 선량보다 각각 Bismuth 26.41%, 17.52%, Aluminum 18.24%, 9.39%, Silicone 19.47%, 14.39% 감소되었다. 물의 CT Number, Noise, Uniformity 항목에서 Bismuth 차폐체의 경우 팬텀영상 검사 기준을 초과하였으며, Aluminum, Silicone의 경우는 기준내에 포함되었다. 화질의 변화를 줄이면서 차폐의 효과를 보고자 할 때 가공성이 좋고 구입하기 쉬운 Silicone을 이용한 차폐체가 도움이 되리라 생각한다.

The cases of radiographic inspection for medical diagnosis in Korea have been continuously increasing year after year, which pays particularly more attention to CT which occupies over the half of medical radiation exposure. To find an effective alternative for reducing radiation exposure, the researchers conducted comparative experiments using some shields made of bismuth, aluminum 6mm, and silicone 22mm. These shielding materials have been used to reduce the entrance surface dose (ESD) on lenses, maintaining the CT number, noise, and uniformity in brain CT scanning which forms the largest part in CT scanning these days. These experiments showed that the doses in the spiral scan parallel to IOML and the conventional scan in Bismuth were 26.41% and 17.52%, respectively; in Aluminum 18.24% and 9.39%; in Silicone 19.47% and 14.39% lower than compared with those in the cases without any shields. In the items of the CT number, noise, and uniformity, the bismuth shield satisfied exceedingly the standards of the phantom image test while aluminum and silicone were within. To keep the graphic quality and get good shielding effect, we recommend the silicone shield which can be manufactured and purchased with ease.

키워드

참고문헌

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피인용 문헌

  1. The Evaluation of Eye Dose and Image Quality According to The New Tube Current Modulation and Shielding Techniques in Brain CT vol.9, pp.5, 2015, https://doi.org/10.7742/jksr.2015.9.5.279
  2. The Effects of Reducing a Dose on the Genital Gland at a CT Scan on the Whole Abdomen According to the Shielding Material vol.10, pp.6, 2016, https://doi.org/10.7742/jksr.2016.10.6.419