目的利用头颈、仿真人和肺部模体检测射波刀IGRT治疗脊柱追踪时仰卧与俯卧位照射精度并进行对比分析,为俯卧位脊柱追踪的应用提供参考数据。方法用CT对装有胶片的头颈、仿真人和肺部模体分别进行仰卧和俯卧位扫描,然后利用治疗计划系统分别设计仰卧和俯卧位模体计划,执行模体计划。利用E2E软件分析照射精度,对比这种两种卧姿的照射精度。结果仰卧与俯卧位精度检测结果,颈椎的追踪精度分别为0.77和0.87 mm,胸椎的为0.78和0.76 mm,腰椎的为0.89和0.80 mm,骶椎的为1.90和2.27 mm,4个不同椎体仰卧与俯卧位精度偏差分别为:0.01、0.02、0.09和0.37 mm。结论对于这三种静态模体,颈椎、胸椎、腰椎和骶椎仰卧与俯卧位脊柱追踪精度偏差很小,可以认为具有同等的照射精度。 OBJECTIVE: To provide reference data for the application of prone traumatic spinal tracking by using IGRT of head and neck, artificial person and pulmonary phantom to detect the irradiation accuracy of supine and prone position in spinal tracking. Methods The head and neck, simulated human and lung phantom with film were scanned by supine and prone position with CT respectively. Then the model planning of supine and prone position was designed by the treatment planning system and the phantom plan was implemented. The use of E2E software analysis of the illumination accuracy, contrast of these two kinds of lying posture illumination accuracy. Results The accuracy of supine position and prone position were 0.77 and 0.87 mm for cervical vertebrae, 0.78 and 0.76 mm for thoracic vertebrae, 0.89 and 0.80 mm for lumbar vertebrae, and 1.90 and 2.27 mm for sacral vertebrae respectively. Four different vertebral bodies Supine and prone position precision deviation were: 0.01,0.02,0.09 and 0.37 mm. Conclusions For these three kinds of static motifs, the tracking accuracy of the supine and prone position of the cervical vertebra, thoracic vertebra, lumbar vertebra and sacral vertebra is very small and can be regarded as having the same illumination precision.