热塑体膜固定双重标记下保乳术后调强放疗移位误差的初步分析

Preliminary analysis in body position error of intensity modulated radiotherapy after breast conserving surgery underdouble-tagging thermoplastic body film fixation

目的探讨热塑体膜固定双重标记在乳腺癌保乳术后调强放疗中应用的周期性误差。方法对20例乳腺癌保乳术后热塑体膜固定双重标记调强放疗患者分别在治疗开始后1、2、3周采用模拟定位机测量患者的左右、头足、前后方向和乳房的重复摆位误差。结果第1周误差较大,而第2、3周的误差相对较小,第1、2、3周相比较差异有统计学意义(P<0.05);各个方向的摆位和银夹移位误差均≤2.5 mm。结论热塑体膜固定双重标记技术可减少摆位误差,在乳腺癌保乳术后调强放疗中有较好稳定性和重复性。

Objective To explore the periodic error of double- tagging thermoplastic body film fixation in the treatment of intensity modulated radiotherapy after breast conserving surgery. Methods Twenty patients received intensity modulated radiotherapy under double - tagging thermoplastic body film fixation after breast conserving surgery were calculated with repetitive position error of head and foot, direction and breast after 1 week, 2 weeks and 3 weeks of treatment. Results The error in first week was large, but second and third weeks were relatively small, and there was significant difference among the first week, second week and third week （P 〈 0.05 ）. Positioning in each direction and silver clips displacement error were less or equal to 2.5 mm. Condlusion The technique of double- tagging thermoplastic body film fixation can reduce the position error, and it has the better stability and repeatability in breast cancer patients received intensity- modulated radiotherapy after breast conserving surgery.