Prog Med Phys.
2012 Sep;23(3):169-176.
An Analysis of Intra-Fractional Movement during Image-Guided Frameless Radiosurgery for Brain Tumor Using CyberKnife
- Affiliations
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- 1Department of Radiation Oncology, School of Medicine, Gyeongsang National University, Jinju, Korea. jeong3023@gmail.com
- 2Department of Neurosurgery, School of Medicine, Gyeongsang National University, Jinju, Korea.
- 3GyeongSang Institute of Health Sciences, Jinju, Korea.
- 4Proton Therapy Center, National Cancer Center, Goyang, Korea.
Abstract
- Frameless method in brain radiosurgery has advantages relative to rigid head-frame method in terms of patient friendly and flexible application of multi-fractionation. However, it has also disadvantages and the most negative point is that it cannot control the patient motion during treatment as lowly as the level of the frame-based radiosurgery, which could affect to the treatment accuracy. In the present study, we analyzed the geometric uncertainty of the intra-fraction motion using the actual treatment records of 294-CyberKnife treatments for brain tumors. Based on the analysis, we statistically presented the magnitude of intra-fraction motion in frameless radiosurgy. The result could provide the quantitative information to determine the adequate treatment margins to compensate the intra-fraction movements.
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