Korean J Med Phys.
2009 Mar;20(1):14-20.
Analysis of Dose Distribution on Critical Organs for Radiosurgery with CyberKnife Real-Time Tumor Tracking System
- Affiliations
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- 1Department of Radiation Oncology, College of Medicine, Inha University, Incheon, Korea.
- 2Department of Radiation Oncology, College of Medicine, Hanyang University, Seoul, Korea.
- 3Department of Radiation Oncology, Korea Institute of Radiological and Medical Science, Korea.
- 4Department of Radiation Oncology, College of Medicine, Kwandong Univerisity, Seoul, Korea.
- 5Department of Radiation Oncology, Gachon Medical School, Gil Medical Center, Incheon, Korea.
- 6Department of Radiation Oncology, School of Medicine, Ewha Womans University, Seoul, Korea.
- 7Department of Radiation Oncology, School of Medicine, Kyung Hee University, Seoul, Korea. ohsd32@naver.com
Abstract
- We measured the dose distribution for spinal cord and tumor using Gafchromic film, applying 3D and 4D-Treatment Planning for lung tumor within the phantom. A measured dose distribution was compared with a calculated dose distribution generated from 3D radiation treatment planning and 4D radiation treatment planning system. The agreement of the dose distribution in tumor for 3D and 4D treatment planning was 90.6%, 97.64% using gamma index computed for a distance to agreement of 1 mm and a dose difference of 3%. However, a gamma agreement index of 3% dose difference tolerence of and 2 mm distance to agreement, the accordance of the dose distribution around cord for 3D and 4D radiation treatment planning was 57.13%, 90.4%. There are significant differences between a calculated dose and a measured dose for 3D radiation treatment planning, no significant differences for 4D treatment planning. The results provide the effectiveness of the 4D treatment planning as compared to 3D. We suggest that the 4-dimensional treatment planning should be considered in the case where such equipments as Cyberknife with the real time tracking system are used to treat the tumors in the moving organ.
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