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[目的]探讨增加摆位参考点是否可提高腹部肿瘤真空袋固定的摆位重复性。[方法]将30例腹部肿瘤患者随机分两组:试验组增加摆位参考点,对照组不增加摆位参考点。对每例患者拍摄模拟定位片和治疗验证片,通过图像验证系统将验证片中感兴趣的解剖骨性参考点与模拟定位片的相应参考点重复融合,测量X、Y方向的摆位误差(x,y),分析比较两组的摆位重复性。设定治疗允许误差为3mm,∣x∣≤3mm或∣y∣≤3mm为阳性计数,把∣x∣>3mm或∣y∣>3mm为阴性计数。[结果]增加摆位参考点组的阳性率是82.2%,不增加摆位参考点组阳性率是75.3%,增加摆位参考点组阳性率较对照组提高6.9%。[结论]腹部肿瘤使用真空袋固定时,增加摆位参考点源皮距读数有利于摆位重复性的提高,可减少摆位误差。
[Objective] To explore whether increasing the reference point of setting can increase the fixed position repeatability of vacuum bag of abdominal tumor. [Method] Thirty patients with malignant tumor of the abdomen were randomly divided into two groups: the experimental group increased the reference point of setting and the control group did not increased the reference point of setting. For each patient, a simulated positioning piece and a treatment verification piece were taken, and the relevant reference points of the simulated positioning piece and the corresponding reference points of the verification positioning piece were repeatedly fused by the image verification system to measure the setup error in the X, Y directions x, y), analysis and comparison of the two groups of positioning repeatability. Set the treatment allowable error of 3mm, | x | ≤ 3mm or | y | ≤ 3mm for the positive count, the | x |> 3mm or | y |> 3mm negative count. [Results] The positive rate of setting reference point group was 82.2%, the positive rate of setting reference point group was 75.3%, and the positive rate of setting reference point group was 6.9% higher than that of control group. [Conclusions] When the tumor of the abdomen is fixed with a vacuum bag, increasing the reading of the skin reference point of the reference point is beneficial to the increase of the repeatability of the setting position and the error of the setting error.