Analysis of setup error at rectal cancer radiotherapy technique

직장암 방사선치료기법별 자세오차에 관한 분석

  • Kim, Jeong-Ho (Department of Radiation Oncology, Konyang University Hospital) ;
  • Bae, Seok-Hwan (Division of Radiology, Konyang University) ;
  • Kim, Ki-Jin (Department of Nuclear Medicine, Konyang University Hospital) ;
  • Yu, Se-Jong (Department of Radiology, Konyang University Hospital) ;
  • Kim, Jee-Yoon (Hyejeon College, Dept. of Nursing)
  • 김정호 (건양대학교병원 방사선종양학과) ;
  • 배석환 (건양대학교 방사선학과) ;
  • 김기진 (건양대학교병원 핵의학과) ;
  • 유세종 (건양대학교병원 영상의학과) ;
  • 김지윤 (혜전대학교 간호학과)
  • Received : 2013.10.23
  • Accepted : 2013.12.05
  • Published : 2013.12.31


Radiotherapy of rectal cancer requires a stabilized image but the movement of patients is almost unavoidable in radiotherapy. In this study, the setup error using the radiation treatment technique was compared according to the loading time and BMI(Body Mass Index) for 14 patients with rectal cancer. In addition, the variation of the dose by the average setup error was compared. Therefore, the technique of a selective standard was established. As a result, 3DCRT(3-Dimensional Radiation Therapy) and VMAT(Volumetric Modulated Arc Therapy) showed a similar time and error. In comparison, IMRT(Intensity Modulated Radiation Therapy) increased the time two fold and the error four fold. In BMI, a more pyknic patient showed a larger error for all techniques. Regarding the dose, IMRT and VMAT increased much more than 3DCRT in the average error at the small bowel. Therefore, 3DCRT of the short time will be applied to pyknic rectal cancer. Moreover, VMAT selects than IMRT in the overexposure of the small bowel.


Conformity index;Homogeneity index;Quality of coverage;Radiotherapy technique;Rectal cancer


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