摆位误差和患者体重指数在鼻咽癌调强放疗中的相关性

The correlation analysis between setup errors and its body mass index in patients treated with intensity-modulated radiation therapy of nasopharyngeal carcinoma

目的 探究在鼻咽癌的调强放疗中摆位误差和患者的体重指数的相关性。方法 选取30例鼻咽癌患者为研究对象,结合相应的CT影像资料采集患者的病灶信息,包括患者的左右、头角以及腹背三个层面的数据,计算出相应的摆位误差后对摆位方法进行探索分析。结果 左右、头角以及腹背三个方向的系统误差分别为17 mm、2.46 mm、3.04 mm,随机误差分别为2.87 mm、2.58 mm、3.49 mm,腹背方向误差最大。患者BMI指数为16.73~27.61,平均21.88。结合患者单个方向的误差均值与其体重指数进行相应的speraman分析,结果显示无相关性。结论 肯定了摆位方法的科学合理性,在放疗过程中患者的摆位误差和体重指数并无相关性。

Objective To explore the relationship between setup errors and body mass index （BMI） in patients treated with intensity-modulated radiation therapy （IMRT） of nasopharyngeal carcinoma. Methods 30 patients with nasopharyngeal carcinoma were chosen. Information of focus were collected based on CT images of patients, data in three directions （Right-Left, Superior-Inferior, and Anterior-Posterior）. The setup error in patients treated with IMRT was calculated to analyzing the placement technique. Results The systematic error in three directions were 17 mm, 2.46 mm, 3.04 mm, and the random error were 2.87 mm, 2.58 mm, 3.49 mm respectively, error, in Anterior-Posterior was maximum. At the same time the patient＇s BMI index between 16.73 and 27.61, the average of BMI was 21.88. Speraman analysis was made according to the minimum error of individual direction and BMI of patients, the results showed that no correlation. Conclusion There was no correlation between the setup errors and BMI, and the plan more scientific and rational