Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Evaluation of Metal Artifact Reduction for Orthopedic Implants (O-MAR) on Radiotherapy Treatment Planning

방사선 치료 계획 시 O-MAR (Metal Artifact Reduction for Orthopedic Implants) 적용의 유용성 평가

  • Won, Huisu (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Hong, Joowan (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Kim, Sunyoung (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Choi, Jaehyock (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Cho, Jaehwan (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Yang, Hanjoon (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Lee, Jin (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Lee, Sunyeob (Department of International Radiological Science, Hallym University of Graduate Studies) ;
  • Park, Cheolsoo (Department of International Radiological Science, Hallym University of Graduate Studies)
  • 원희수 (한림국제대학원대학교 국제방사선학과) ;
  • 홍주완 (한림국제대학원대학교 국제방사선학과) ;
  • 김선영 (한림국제대학원대학교 국제방사선학과) ;
  • 최재혁 (한림국제대학원대학교 국제방사선학과) ;
  • 조재환 (한림국제대학원대학교 국제방사선학과) ;
  • 양한준 (한림국제대학원대학교 국제방사선학과) ;
  • 이진 (한림국제대학원대학교 국제방사선학과) ;
  • 이선엽 (한림국제대학원대학교 국제방사선학과) ;
  • 박철수 (한림국제대학원대학교 국제방사선학과)
  • Received : 2014.03.17
  • Accepted : 2014.08.25
  • Published : 2014.08.30
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Abstract

The aim of this study is evaluation of dose distribution on radiation therapy planning system with the CT image of high-density material inserted phantom. Gammex 467 Tissue Characterization Phantom is used to acquire an image similar to the human tissues and insert a Titanium to generate metal artifact. The acquired images were reconstructed with Metal Artifact Reduction for Orthopedic Implants (O-MAR). By using the treatment planning system, the volume was analyzed and dose distribution was extracted. Photon dose distribution in linear accelerator was measured by the $MapCHECK^{TM}$ and compared with planned and measured dose distributions. In result of the comparative analysis, when artifact is generated by Titanium, The volume applied O-MAR was increased 6.8% to BR-12 Breast and 40.2% to LV 1 Liver. After O-MAR was used, Dose distribution was higher 1.4 to 1.6% than before. Consequently, The artifact caused by metal objects should be removed if possible, and after that used in the radiotherapy treatment plan can be considered to reduce errors.

본 연구에서 Phantom에 고 밀도 물질이 삽입 된 CT 영상을 재구성 하여 방사선 치료 계획 시 선량 분포에 대한 평가를 하고자 하였다. Gammex 467 Tissue Characterization Phantom을 사용하여 인체 조직과 유사한 영상을 획득하였고 Titanium을 삽입하여 금속물로 인한 인공허상을 발생시켜 영상을 획득하였다. 획득한 영상은 Metal Artifact Reduction for Orthopedic Implants (O-MAR)를 이용하여 영상을 재구성 하였고 전산화 치료계획 시스템을 이용하여 체적을 분석 하고 선량 분포를 추출하였다. $MapCHECK^{TM}$을 이용하여 선형가속기의 광자선 선량 분포를 측정하여 계획한 선량 분포와 비교 분석 하였다. 비교 분석 결과 Titanium으로 인한 인공허상이 발생 되었을 때 O-MAR를 적용한 체적은 BR-12 Breast는 16.8 % 그리고 LV 1 Liver는 40.2 % 증가하였고 선량 분포는 O-MAR를 적용하기 전의 선량 분포 보다 1.4 에서 1.6 % 높게 나타났다. 결론적으로 금속물로 발생된 인공허상 O-MAR를 적용하여 가능한 제거하고 치료계획에 이용해야 오류를 줄일 수 있을 것으로 사료된다.

Keywords

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