Proceedings of the Korean Society of Medical Physics Conference (한국의학물리학회:학술대회논문집)

Korean Society of Medical Physics (한국의학물리학회)
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Image-Guided Radiotherapy for Target Localization in Prostate Cancer with Implanted Markers

  • Suh, Ye-Lin (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Park, Sung-Ho (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Ahn, Seung-Do (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Kim, Jong-Hoon (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Lee, Sang-Wook (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Shin, Seong-Soo (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Choi, Eun-Kyung (Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine)
  • Published : 2005.04.15
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Abstract

To precisely localize target in prostate cancer, image-guided radiotherapy was performed using the $ExacTrac^{\circledR}$ x-ray system (Brainlab, Germany) with implanted markers. For three prostate cancer patients, three gold markers were implanted into prostate. Orthogonal portal images were acquired every treatment and CT scans were repeated 3～5 times during the course of treatment. After correcting setup errors calculated by the system, the position of the implanted markers and the distance between them were detected in daily portal images and in CT images, and analyzed retrospectively. Deviation of the relative position of the implanted markers and the distance between them were less than 1 mm in lateral, longitudinal, and vertical direction for three patients, both in portal images and CT images. This study reveals that image-guided radiotherapy using the $ExacTrac^{\circledR}$ system is useful to verify positioning errors and localize prostate target with implanted markers, reducing the planning target volume (PTV) margin as well as irradiation to rectum and bladder.

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