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An Analysis of Intra-Fractional Movement during Image-Guided Frameless Radiosurgery for Brain Tumor Using CyberKnife  

Kang, Ki Mun (Department of Radiation Oncology, School of Medicine, Gyeongsang National University)
Chai, Gyu Young (Department of Radiation Oncology, School of Medicine, Gyeongsang National University)
Jeong, Bae Gwon (Department of Radiation Oncology, School of Medicine, Gyeongsang National University)
Ha, In-Bong (Department of Radiation Oncology, School of Medicine, Gyeongsang National University)
Park, Kyung Bum (Department of Neurosurgery, School of Medicine, Gyeongsang National University)
Jung, Jin-Myung (Department of Neurosurgery, School of Medicine, Gyeongsang National University)
Lim, Young Kyung (Proton Therapy Center, National Cancer Center)
Jeong, Hojin (Department of Radiation Oncology, School of Medicine, Gyeongsang National University)
Publication Information
Progress in Medical Physics / v.23, no.3, 2012 , pp. 169-176 More about this Journal
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.
Keywords
Stereotactic radiosurgery; Frameless radiosurgery; Brain tumor; Intra-fraction movement;
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