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目的分析适形调强放射治疗的摆位误差以及验证计划射野正确性。方法选取临床适形调强放射治疗患者30例,其中头颈部肿瘤12例,胸部肿瘤10例,腹部肿瘤8例。放疗前进行人工摆位后采取全锥形束CT(CBCT)图像采集并和大孔径CT平扫图像进行三维立体比较,从而得到摆位误差。结果头颈部肿瘤在左右、头脚、腹背方向的摆位误差分别是(-0.72±1.36)、(-0.61±1.44)、(-0.51±1.57)mm,外扩边界分别是2.08、2.05、2.08mm。胸腹部肿瘤左右、头脚、腹背方向的摆位误差分别是(-2.62±3.46)、(-2.41±2.94)、(-2.31±3.67)mm,外扩边界分别是6.08、5.35、5.98mm。结论头颈部摆位误差最小,胸腹部摆位误差较大。计划靶区在临床靶区外扩要根据每个患者的部位不同而定。
Objective To analyze the setup errors of the intensity modulated radiation therapy and to verify the correctness of the planned field coverage. Methods Thirty patients with clinically modulated IMRT were selected, including 12 cases of head and neck cancer, 10 cases of chest tumor and 8 cases of abdominal tumor. Before the radiotherapy, the whole cone beam CT (CBCT) image was collected and compared with the large aperture CT plain image for three-dimensional comparison to get the setup error. Results The setup errors of head and neck tumors in the left, right, head and abdomen were (-0.72 ± 1.36), (-0.61 ± 1.44) and (-0.51 ± 1.57) mm, respectively. The external expansion boundaries were 2.08 and 2.05, 2.08mm. The errors in the positioning of the thoracic and abdominal tumors were (-2.62 ± 3.46), (-2.41 ± 2.94), (-2.31 ± 3.67) mm respectively, and the expansion boundaries were 6.08, 5.35 and 5.98 mm respectively. Conclusion The head and neck positioning error is the smallest, the error of setting the chest and abdomen is larger. Planned targets outside the clinical target zone expansion according to each patient’s site may be different.