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目的分析热塑膜固定联合标记法对于盆腔肿瘤摆位误差影响。方法 40例盆腔肿瘤患者,按照随机数字表法将患者分为研究组和对照组,各20例,均应用热塑膜固定,研究组同时在患者腰部做体表标记,前5次放疗前行CBCT扫描,在线匹配得出X(左右)、Y(头足)、Z(腹背)三个方向摆位误差,对照两组数据行统计学分析。结果两组患者在X、Z方向上比较,差异无统计学意义(P>0.05),研究组的Y轴平均摆位误差(3.2±1.8)mm低于对照组的(4.4±1.5)mm,差异有统计学意义(P<0.05)。结论热塑膜固定患者同时行体表标记可以明显提高盆腔肿瘤患者放疗的摆位精度,值得推广。
OBJECTIVE: To analyze the effect of thermoplastic film fixation combined with marking method on setting error of pelvic tumor. Methods Forty patients with pelvic tumor were divided into study group and control group according to the random number table method. All 20 patients were treated with thermoplastic film fixation. The study group also performed body surface marker on the patient’s lumbar region. Before the first five radiotherapy CBCT scan, online matching obtained X (left and right), Y (head), Z (dorsal) set of three directions error, the control two groups of data were statistically analyzed. Results There was no significant difference in the X and Z directions between the two groups (P> 0.05). The mean Y-axis setup error of the study group (3.2 ± 1.8) mm was lower than that of the control group (4.4 ± 1.5) mm, The difference was statistically significant (P <0.05). Conclusions Simultaneous surface markers of patients with thermoplastic membrane fixation can significantly improve the positioning accuracy of radiotherapy in patients with pelvic tumors, which is worth promoting.