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http://dx.doi.org/10.5762/KAIS.2013.14.12.6346

Analysis of setup error at rectal cancer radiotherapy technique  

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)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.14, no.12, 2013 , pp. 6346-6352 More about this Journal
Abstract
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.
Keywords
Conformity index; Homogeneity index; Quality of coverage; Radiotherapy technique; Rectal cancer;
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