摘要
目的：盆腔调强放疗计划会在肿瘤靶区周围产生剂量的梯度陡降,因此对患者的精确摆位至关重要。摆位误差一旦超可控范围,肿瘤靶区周围的正常组织将受不必要的照射。本文为量化放疗摆位方法的科学性,并且讨论体重指数对摆位误差的影响。方法：对我科2014年1~6月通过盆腔调强放疗治疗的35名妇科肿瘤患者分别进行多组CT图像的采集,获得患者在RL（左右）,SI（头脚）和AP（腹背）方向的偏移数据,从而计算出摆位误差,验证摆位方法。同时,我们通过多次测算每个患者体重指数,将其平均值与其个体误差数据进行比对,了解体重、身高等因素对摆位误差的影响。结果：系统误差在RL、SI和AP方向分别为2.1、2.4和3.0 mm,随机误差在RL、SI和AP方向分别为2.8、2.6和3.5 mm。结论：肯定了摆位方法的科学合理,确定了CTV到PTV的外扩边界大小,患者摆位误差与体重指数并无相关性。
Objective： Intensity-modulated whole dose gradients around the target volume, and thus pelvic radiation therapy （IM-WPRT） plans result in steep accurate patient setup is essential. We will quantify the accuracy of our patient positioning, and discuss the effect of body mass index of setup error. Methods： We examined the CT images of 35 women treated with IM-WPRT at our institution, get the data in three directions （RL,SI and AP）,and calculate the setup error in patients treated with IM-WPRT to verify patient positioning. Calculating the average of body mass index （BMI）, we find there is a relationship between the setup error and BMI. Results： In three directions（RL,SI and AP）, the systematic error is 2.1 mm,2.4 mm and 3.0 mm, and the random error is 2.8 mm,2.6 mm and 3.5 mm. Conclusion： Determine the CTV to PTV outside enlarge border size, we make the IM-WPRT plan more scientific. There was no correlation between the magnitude of these errors and the BMI. K
出处
《泸州医学院学报》
2015年第5期498-501,共4页
Journal of Luzhou Medical College
关键词
妇科肿瘤
调强放疗
摆位方法
误差
体重指数
Gynecological malignancies
IMRT
Positioning method
Setup errors
BMI
