Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Changes in Volume Dose by Treatment Plan According to pCT and CBCT in Image-guided Radiation Therapy for Prostate Cancer

전립선암 영상유도방사선치료 시 pCT와 CBCT에 따른 치료계획별 체적선량의 변화

  • Won, Young Jin (Department of Radiation Oncology, InJe University Ilsan Paik Hospital) ;
  • Kim, Jung Hoon (Department of Radiation Oncology, KonYang University Hospital)
  • 원영진 (인제대학교 일산백병원 방사선종양학과) ;
  • 김정훈 (건양대학교병원 방사선종양학과)
  • Received : 2018.02.20
  • Accepted : 2018.05.18
  • Published : 2018.06.30
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Abstract

The results of CBCT was obtained using image guided radiation therapy for radiation therapy in 5 prostate cancer patients. Using these results, we compared and evaluated the dose changes according to the treatment plan depending on the volume and position of bladder, rectum, and prostate. The 28 images of CBCT were acquired using On-Board Imaging device before radiotherapy. After the outline of bladder, rectum, and PTV, pCT images and CBCT images for radiotherapy were treated respectively. The volume of the bladder was increased by 105.6% and decreased by 45.2%. The volume of the rectum was increased by 30.5% and decreased by 20.3%. Prostate volume was increased by 6.3% and decreased by 12.3%. The mean dose of the rectum was higher in the CBCT than in the pCT, and V40 (equivalent to 40 Gy) of the bladder showed a reduction in all treatment regimens in the CBCT than in the pCT. Conformity treatment and homogeneity index of PTV showed better results in all treatment regimens using pCT than CBCT. It was found that the dose distribution of the pelvic internal organs varied greatly according to the patient 's condition and pretreatment.

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References

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