Measurement of Skin Dose for Rectal Cancer Patients in Radiotherapy using Optically Stimulated Luminescence Detectors (OSLDs)

광자극발광선량계(OLSDs)를 이용한 직장암 방사선치료 환자의 피부선량 측정

  • Im, In-Chul (Department of Radiological Science, Dongeui University) ;
  • Yu, Yun-Sik (Department of Radiological Science, Dongeui University) ;
  • Lee, Jae-Seung (Department of Radiation Oncology, Good Samaritan Hospital)
  • 임인철 (동의대학교 방사선학과) ;
  • 유윤식 (동의대학교 방사선학과) ;
  • 이재승 (선린의료원 방사선종양학과)
  • Received : 2011.05.17
  • Accepted : 2011.06.07
  • Published : 2011.06.30

Abstract

This study used the optically stimulated luminescence dosimeters (OSLDs), recently, received the revaluation of usefulness in vivo dosimetry, and the diode detecters to measure the skin dose of patient with the rectal cancer. The measurements of dose delivered were compared with the planned dose from the treatment planning system (TPS). We evaluated the clinical application of OSDs in radiotherapy. We measured the calibration factor of OSLDs and used the percent depth dose to verified, also, we created the three point of surface by ten patients of rectal cancer to measured. The calibration factors of OSLD was 1.17 for 6 MV X-ray and 1.28 for 10 MV X-ray, demonstrating the energy dependency of X-ray beams. Comparison of surface dose measurement using the OSLDs and diode detectors with the planned dose from the TPS, The skin dose of patient was increased 1.16 ~ 2.83% for diode detectors, 1.36 ~ 2.17% for OSLDs. Especially, the difference between planned dose and the delivery dose was increased in the perineum, a skin of intense flexure region, and the OSLDs as a result of close spacing of measuring a variate showed a steady dose verification than the diode detecters. Therefore, on behalf of the ionization chamber and diode detecters, OSLDs could be applied clinically in the verification of radiation dose error and in vivo dosimety. The research on the dose verification of the rectal cancer in the around perineal, a surface of intense flexure region, suggest continue to be.

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