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The clinical effect of Body-Fix device in improving the positioning accuracy of the hypofractionated radiotherapy in the vertebral metastatic patients
ZHANG Ya-qin, LIU Yu-jie, XU Qing, ZHU Guo-pei, ZHANG Zhen
Department of Radiation Oncology, Cancer Hospital of Fudan University, Department of Oncology, Shanghai Medical College of Fudan University, Shanghai 200032,China
Abstract Objective To study the immobilization effect and keep the accurate treating position of Body-Fix device in the patients with vertebral metastatic tumor treated by hypofractionated intensity-modulated radiotherapy. Methods From October 2008 to February 2010, six nasopharyngeal carcinoma patients with 10 treated lesion with vertebral metastasis who were treated by hypofractionated intensity-modulated radiotherapy and immobilized by the Body-Fix device were enrolled in this study. Three sets cone beam CT images were taken and recorded when patient was underway the initial setup, position correction and after radiation delivery. Comparing these images with the planning CT images to get the setup errors and the intrafractional position shifting, and the immobilization effect of Body-Fix device was analyzed. Results In the upper, middle and lower sections of the vertebrae, the intrafractional setup errors in the left-right direction were (－0.6±0.5) mm,(－0.1±1.0) mm,(0.0±0.4) mm, with in the superior-inferior direction (1.0±1.4) mm,(4.8±5.7) mm,(0.0±0.3) mm and in the anterior-posterior direction (1.2±5.2) mm,(－0.3±0.3) mm,(0.0±0.5) mm, respectively. Conclusions With Body-Fix device, the intrafractional setup errors can be minimized within 2 mm which make the accurate spinal radiosurgery technique possible.
ZHANG Ya-qin,LIU Yu-jie,XU Qing et al. The clinical effect of Body-Fix device in improving the positioning accuracy of the hypofractionated radiotherapy in the vertebral metastatic patients[J]. Chinese Journal of Radiation Oncology, 2013, 22(4): 315-317.
ZHANG Ya-qin,LIU Yu-jie,XU Qing et al. The clinical effect of Body-Fix device in improving the positioning accuracy of the hypofractionated radiotherapy in the vertebral metastatic patients[J]. Chinese Journal of Radiation Oncology, 2013, 22(4): 315-317.
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2013, Vol. 22 
