论文部分内容阅读
目的探讨乳腺托架和真空垫两种体位固定方式对乳腺癌调强放疗（IMRT）摆位误差的影响。方法采用病例对照研究，A组患者采用乳腺托架体位固定方式，B组患者采用真空垫体位固定方式，治疗首次以及之后1次/w CBCT扫描，在线配准人工校对得出患者左右、上下、前后方向摆位误差，比较两组误差的大小。结果 A组左右、上下、前后三个方向上的摆位误差分别为（3.28±1.83）mm、（2.94±2.21）mm、（2.63±1.79）mm，B组左右、上下、前后三个方向上的摆位误差分别为(2.06±1.25)mm、(2.13±1.33)mm、(2.52±1.68)mm。两组误差在左右、上下方向比较有显著性差异（0.05）。结论采用真空垫体位固定方式在控制误差方面优于乳腺托架固定方式，能提高患者治疗的摆位精准度，缩短了摆位时间，更适合临床使用。“,”Objective To explore the ef ects of two posture fixation methods-breast bracket and vacuum pad-on the setup er or of intensity-modulated radiation therapy (IMRT) of the breast cancer. Methods Case-control study was adopted.Breast bracket fixation was adopted in Group A while vacuum pad fixation was adopted in Group B.After the initial therapy,CBCT scan was performed once weekly.Setup errors of al directions were obtained through online registration and artificial proofreading.And the er ors between the two groups were compared.Results The mean setup er ors on the left-right direction,superior-inferior direction and anterior-posterior direction were (3.28±1.83)mm,(2.94±2.21)mm and (2.63±1.79)mm in Group A,and the cor esponding errors were (2.06±1.25)mm, (2.13±1.33)mm and (2.52±1.68)mm in Group B. Er ors of the two groups had significant dif erence ( 0.05).Conclusion Vacuum pad fixation is bet er than breast bracket fixation in er or control,which can improve the positioning accuracy of the patients,shorten the time of placement,and is more suitable for clinical use.