盆腔部肿瘤调强放疗中摆位误差的分析

Analysis of set-up error for pelvic tumors with IMRT

目的测定盆腔部肿瘤在调强放射治疗中的摆位误差,分析误差的原因并加以控制,以提高放疗准确性。方法选取40例盆腔部肿瘤患者,用电子射野影像装置拍摄验证片,将验证片和计划靶区影像图进行误差比较。结果在左右、头脚、前后方向上的误差分别为(2.10±1.25)、(2.65±1.60)、(2.40±1.50)mm。结论对于盆腔部调强放疗的患者,临床靶区(CTV)到计划靶区(PTV)扩边范围为左右6.13 mm,头脚7.75 mm,前后7.05 mm。

Objective To determine the set-up error of pelvic tumors in intensity modulated radiation therapy(IMRT)and to analyze the causes of errors and control them to improve the accuracy of radiotherapy.Methods Forty pelvic tumor cases were selected and checked with electronic portal imaging device(EPID)to take the verification image and compare the verification image and planned target image.Results The set-up errors in left-right,superior-inferior,anterior-posterior were(2.10±1.25),(2.65±1.60),(2.40±1.50)mm,respectively.Conclusions For the pelvic tumor patients with IMRT,the range of CTV to PTV is about 6.13 mm in left-right direction,7.75 mm in superior-inferior direction and 7.05 mm in anterior-posterior direction.