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[目的]通过对头颈部肿瘤患者的射野图像分析,了解摆位误差分布情况,为治疗计划设计设置提供依据。[方法]通过对数字重建图像和模拟定位机拍摄的正、侧位验证图像的骨性解剖结构配准,计算平移和旋转误差。[结果]左右、头脚和腹背方向平移误差分别为1.33±1.22mm、1.28±1.25mm和1.22±1.29mm;旋转误差冠状面为0.52°±1.01°,矢状面0.82°±0.91°。[结论]对于头颈部肿瘤调强放疗,临床靶区到计划靶区的外放边界在左右3.5mm、头脚3.4mm和腹背3.3mm。考虑到旋转误差靶区两端外放要大一些。
[Objective] To understand the distribution of setup errors by analyzing the field images of head and neck cancer patients and provide the basis for the design of treatment plans. [Methods] The translational and rotational errors were calculated by aligning the anatomical structures of the orthognathic and lateral images captured by the digitally reconstructed images and the simulated positioner. [Result] The translational errors of left, right, head and back were 1.33 ± 1.22mm, 1.28 ± 1.25mm and 1.22 ± 1.29mm respectively; the rotation error coronal plane was 0.52 ° ± 1.01 ° and the sagittal plane was 0.82 ° ± 0.91 °. [Conclusion] For head-and-neck tumor IMRT, the clinical target area to the planned target area is about 3.5mm left and right, 3.4mm head and foot and 3.3mm abdomen and back. Taking into account the target rotation error of the external release to be larger.