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KMID : 0384620120230030169
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Korean Journal of Medical Physics
2012 Volume.23 No. 3 p.169 ~ p.176
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An Analysis of Intra-Fractional Movement during Image-Guided Frameless Radiosurgery for Brain Tumor Using CyberKnife
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Kang Ki-Mun
Chai Gyu-Young
Jung Bae-Kwon
Ha In-Bong
Park Kyung-Bum
Lim Young-Kyung
Jeong Ho-Jin
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Abstract
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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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KEYWORD
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Stereotactic radiosurgery, Frameless radiosurgery, Brain tumor, Intra-fraction movement
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