论文部分内容阅读
目的探讨有颈淋巴结转移的鼻咽癌调强放疗中头部和颈部摆位误差是否存在差异。方法采集头颈肩热塑面罩固定的17例中晚期鼻咽癌(T2-4N1-3M0)患者的模拟机位置验证图像,与首次计划设计的CT扫描数字重建影像(DRR)图像进行骨性参考点的偏离值比较,并采用双独立样本t检验头部、颈部摆位误差。结果头部摆位误差分别为:X轴(左右)(1.08±0.62)mm,Y轴(前后)(1.18±0.92)mm,Z轴(头脚)(1.08±0.99)mm;颈部摆位误差分别为:X轴(2.40±1.86)mm,Y轴(2.07±1.42)mm,Z轴(1.99±1.56)mm,两者之间差异具有统计学意义。结论有颈淋巴结转移的鼻咽癌患者,头部和颈部摆位误差存在明显的差异,应引起临床足够的重视。
Objective To investigate whether there is difference between the setup errors of the head and the neck in patients with cervical lymph node metastasis by intensity modulated radiotherapy. Methods Simulator position images of 17 patients with moderate and advanced nasopharyngeal carcinoma (T2-4N1-3M0) with head and shoulder thermoplastic masks were collected and compared with the first planned CT scan digital reconstruction image (DRR) The deviation of the value of comparison, and using two independent samples t test head, neck positioning error. The results showed that the errors of the head placement were: (1.08 ± 0.62) mm on the X axis (left and right), 1.18 ± 0.92 mm on the Y axis (1.08 ± 0.99) mm and 1.08 ± 0.99 mm on the Z axis The errors were: X axis (2.40 ± 1.86) mm, Y axis (2.07 ± 1.42) mm and Z axis (1.99 ± 1.56) mm, respectively. The difference between the two methods was statistically significant. Conclusion There are significant differences in the setting errors between the head and neck of NPC patients with cervical lymph node metastasis, which should be paid enough attention in clinic.