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目的比较常规摆位法和前额辅助标记点摆位法在脑胶质瘤术后患者放疗摆位的差异。方法在治疗的第1次和第21次,分别对接受放疗的10例脑胶质瘤术后患者进行常规摆位法放疗摆位,并借助千伏锥形束CT(KVCBCT)分析常规摆位所得的患者X、Y、Z轴方向上的摆位误差;然后采用前额辅助标记点摆位法对患者进行重新摆位,得到患者采用前额辅助标记点摆位法在X、Y、Z轴方向上的摆位误差。对上述得到的2组摆位误差进行配对t检验。结果第1次治疗时,常规摆位法与前额辅助标记点摆位法所得患者X、Y、Z轴方向上的摆位误差无差异。如果以3 mm为界值,常规摆位法的摆位通过率为90.0%,前额辅助标记点摆位法的摆位通过率为96.7%。第21次治疗时,前额辅助标记点摆位法较常规摆位法减少了患者在X轴和Z轴方向上的摆位误差,同时明显提高了患者的摆位通过率(93.4%比67.7%)。结论与常规摆位法相比,前额辅助标记点摆位法对降低脑胶质瘤术后患者放疗摆位误差,尤其是治疗后期的摆位误差具有一定价值。
Objective To compare the difference of postoperative radiotherapy placement in patients with glioma after routine setting method and forehead auxiliary marker placement method. Methods In the first and 21st treatment, 10 patients with glioma after radiotherapy were treated by conventional postoperative radiotherapy and postoperative radiotherapy. KVBCBCT was used to analyze the conventional position setting The resulting patient position errors in the X, Y, Z axis direction; and then use the forehead aided point positioning method to reposition the patient to get the patient forehead aided point positioning method in the X, Y, Z axis direction Set the error on. Paired t-tests were performed on the two sets of setup errors obtained above. Results In the first treatment, there was no difference in the positioning errors in the X, Y, Z axis directions between the routine setting method and the forehead auxiliary marker setting method. If the threshold value of 3 mm, the conventional placement method through the placement rate of 90.0%, forehead aided marker placement method set the passing rate of 96.7%. The 21th treatment, forehead auxiliary marker positioning method compared with conventional positioning method to reduce the patient in the X-axis and Z-axis direction of the positioning error, while significantly improving the patient’s placement pass rate (93.4% vs 67.7% ). Conclusion Compared with the conventional method, the method of setting the forehead aiding point has some value in reducing the setting error of radiotherapy in patients with glioma, especially in the later stage of treatment.