Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Evaluation of Photoneutron During Radiation Therapy when Using Flattening Filter and Tracking Jaw with High Energy X-ray

고 에너지 X선 방사선치료 시 Flattening Filter와 Tracking Jaw 사용에 따른 광중성자 발생 평가

  • Park, Euntae (Department of Radiation Oncology, Busan Paik Hospital, Inje University) ;
  • Jin, Seongjin (Department of Radiation Oncology, Haeundae Paik Hospital, Inje University) ;
  • Park, Cheolwoo (Department of Radiological Technology, Dong-Eui Institute of Technology)
  • 박은태 (부산백병원 방사선종양학과) ;
  • 진성진 (해운대백병원 방사선종양학과) ;
  • 박철우 (동의과학대학교 방사선과)
  • Received : 2016.02.11
  • Accepted : 2016.02.29
  • Published : 2016.02.29
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Abstract

Radiation therapy is usually using linear accelerator and used X-ray energy is also getting higher. Recently linear accelerators has been developed 3F mode and tracking jaw technology and that was applied for patient therapy. This study aims at measuring photoneutrons depending on the use of 3F and tracking jaw system when radiation is irradiated using a linear accelerator. The generation of photoneutrons of 3F system was 70% smaller than 2F system and that of tracking jaw system was 83% higher than static jaw system. Photoneutron value is relatively low. However, it must be minimized for Photoneutron exposure during radiation therapy.

방사선치료는 의료용 선형가속기를 이용하는 방식이 가장 많이 적용되고 있으며 사용되는 광자선도 고 에너지화 되고 있다. 최근에 도입되는 선형가속기에는 선속평탄 여과판을 사용하지 않는 3F 방식과 조사중에 조사야에 맞춰 jaw가 움직이는 tracking jaw 기술이 적용되어 임상에 보급되고 있다. 이에 본 연구는 선형가속기를 이용한 고에너지 X선 조사 시 선속평탄 여과판 사용 유무에 따른 광중성자 발생과, tracking ja w 사용에 따른 광중성자 발생을 측정하여 비교분석하였다. 그 결과 3F 방식이 선속평탄 여과판의 적용에 비하여 광중성자의 검출이 약 70% 낮게 나타났으며, tracking jaw 방식은 static jaw에 비하여 약 83% 높게 광중성자가 발생하는 것으로 나타났다.

Keywords

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