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目的通过分析人头模和实际患者靶点位置的精确度，确定影响ＳＲＳ２００Ｘ－刀系统靶点位置精确度的主要因素，给出精确度的一个数量级，供Ｘ－刀临床医师和物理师参考和借鉴。方法将五个钢珠放在人头模内，测量治疗全过程靶点位置总的精确度。结果ＣＴ定位精确度＞１．０２±０．５０ｍｍ，人头模靶点位置总的精确度为１．４０±０．５０ｍｍ。结论ＣＴ定位、计划设计以及摆位治疗都对靶点位置精确度有影响，对于实际患者还有其他因素影响靶点位置的精确度，因此，治疗总的偏差将更大
OBJECTIVE: To determine the main factors influencing the accuracy of target position of SRS200X-knife system by analyzing the accuracy of the position of human head and the actual patient’s target, giving an order of magnitude of accuracy for reference and reference by X-knife clinicians and physicians . Methods Five steel balls were placed in a human head mold to measure the overall accuracy of the position of the whole process of treatment. Results The accuracy of CT localization was> 1.02 ± 0.50mm, and the total accuracy of the location of human head model was 1.40 ± 0.50mm. Conclusions Both CT positioning, planning design, and positioning therapy have an impact on the accuracy of the target location, and for the actual patient there are other factors that affect the accuracy of the target location, so the overall treatment bias will be greater