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目的通过重复摆位验证的测量数据分析,找出误差原因,提高放射治疗重复摆位的准确度。方法 20例接受盆腔放疗的患者通过真空固定袋仰卧于床上定位并拍摄定位片,进行等中心方式放疗,每周拍验证片,与原定位片比较,测量摆位误差。结果通过20例患者,共166张验证片和原始定位片相对比,X、Y、Z轴误差分别为(0.49±0.28)cm、(0.3±0.19)cm、(0.6±0.24)cm,正、侧面移位旋转为(6.9±2.5)°、(4.8±2.7)°。结论盆腔肿瘤放疗中重复摆位存在一定误差,误差产生的原因考虑与患者关节活动、年龄、胖瘦、放疗工作者的素质、设备质控等有关。
Objective To find out the cause of error and improve the accuracy of radiation therapy repeated setup by repeated measurement of measurement data. Methods Twenty patients undergoing pelvic radiotherapy were placed on the bed with a vacuum bag and were positioned on the bed. The centering radiographs were taken. The card was taken weekly and compared with the original one. The error of setting was measured. Results Compared with the original radiographs, the total of 166 validated films passing through 20 patients were (0.49 ± 0.28) cm, (0.3 ± 0.19) cm and (0.6 ± 0.24) cm, respectively. The positive, Lateral shift rotation is (6.9 ± 2.5) °, (4.8 ± 2.7) °. Conclusion There are some errors in the pelvic tumor radiotherapy. There are some errors in the pelvic tumor radiotherapy. The causes of the errors are related to the patients’ mobility, age, weight and fat, the quality of radiotherapy workers and equipment quality control.