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目的比较鼻咽癌调强适形放疗与常规放疗的摆位误差。方法139例鼻咽癌患者分别接受常规外照射放疗(n=56)和调强适形放射治疗(IMRT)(n=83)。分别测量常规组和IMRT组的摆位误差并进行统计学处理。结果常规组O点误差(3.01±1.78mm)、X轴误差(3.85±2.03mm)、Y轴误差(3.69±2.08mm)和Z轴误差(3.12±2.12mm)明显大于IMRT组的误差(1.76±0.74mm,1.45±0.86mm,1.27±0.93mm和1.87±1.04mm),差异有统计学意义(P<0.05)。结论IMRT技术的摆位误差较常规放疗的小,而且在体位固定、靶区定位、射野控制等方面具有明显优势。
Objective To compare the setting errors of intensity modulated radiotherapy and conventional radiotherapy for nasopharyngeal carcinoma. Methods 139 patients with nasopharyngeal carcinoma underwent routine external beam radiotherapy (n = 56) and intensity modulated radiotherapy (IMRT) (n = 83). The setup errors of routine group and IMRT group were measured and statistically processed. Results The error of O point (3.01 ± 1.78mm), X axis error (3.85 ± 2.03mm), Y axis error (3.69 ± 2.08mm) and Z axis error (3.12 ± 2.12mm) were significantly higher than those of IMRT group (1.76 ± 0.74mm, 1.45 ± 0.86mm, 1.27 ± 0.93mm and 1.87 ± 1.04mm, respectively), the difference was statistically significant (P <0.05). Conclusion IMRT setup error is smaller than conventional radiotherapy and has obvious advantages in fixed position, target location and field control.