Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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Accuracy and radiation exposure from image-guidance in Tomotherapy Hi-Art System

토모테라피 Hi-Art System의 영상유도 정확성 평가와 환자 피폭에 관한 연구

  • Jang, Jae-Uk (Dept. of Biomedical Engineering, Graduate School, Chungnam National University) ;
  • Lim, Hyun-Soo (Dept. of Biomedical Engineering, College of Medicine, Chungnam National University) ;
  • Han, Man-Seok (Dept. of Radiological Science, Kangwon National University) ;
  • Kim, Yong-Kyun (Dept. of Radiological Science, Daewon University College) ;
  • Jeon, Min-Cheol (Dept. of Biomedical Engineering, Graduate School, Chungnam National University)
  • 장재욱 (충남대학교 대학원 의공학과) ;
  • 임현수 (충남대학교 의과대학 의공학교실) ;
  • 한만석 (강원대학교 방사선학과) ;
  • 김용균 (대원대학교 방사선과) ;
  • 전민철 (충남대학교 대학원 의공학과)
  • Received : 2013.08.15
  • Accepted : 2013.10.20
  • Published : 2013.10.28
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Abstract

IGRT(Image Guided Radiation Therapy) in radiation therapy is a very useful technique in order to increase setup of patient and position reproducibility. Tomotherapy can increase accuracy of setup to take IGRT by MVCT, but it be for verified accuracy of Image guided, and MVCT occurs the exposure of patient. Through this study, IGRT accuracy of Tomotherapy is very accurate within 1.0mm. When MVCT using Tomotherapy phantom for QA, QC be taken, exposure dose is Fine(2mm Slice thickness) 3cGy, Normal(4mm Slice thickness) 1.5cGy, Corse(6mmSlice thickness) 1.0cGy. Measurement value of spatial resolution using AAPM CT performance phantom did't cause a big difference. As a result, ability of IGRT in Tomotherapy is very accurate. While obtaining image for IGRT, we should minimize expose range because patient's be exposed to radiation. We should make an effort to do accurate radiation therapy to minimize exposure of patient by selecting the appropriate thickness of MVCT depending on patient's body and treat area.

토모테라피의 영상유도방사선치료는 환자의 자세재현성을 증가시켜 방사선치료의 정확성을 향상 시킬 수 있으나 그 정확성이 검증되어야 하며, MVCT 촬영에 의한 환자피폭이 발생할 수 있다. 본 연구에서 토모테라피의 영상유도 정확성은 1.0mm 이내로 매우 양호하게 측정되었으며, 선량은 각각 Fine(2mm) 3cGy, Normal(4mm) 1.5cGy, Corse(6mm) 1cGy로, 해상력은 Normal에서 비교적 양호하게 나타났다. 따라서 환자 피폭을 줄이기 위해서 Fine 보다 Normal을 선택하고 MVCT 촬영범위를 최소화하여 실시하는 것이 바람직하다.

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