胸部肿瘤斜野照射治疗首次摆位射野参数不符的探讨

The exploration on the chest tumor oblique wild first position inconsistent treatment beam parameters

目的：对胸部肿瘤斜野照射治疗首次摆位射野参数不符进行探讨，通过患者体表标记和升床标记提高摆位精度。方法：选择加速器治疗的40例胸部肿瘤斜野照射的患者首次摆位核对升床，照射野与模拟定位时的数据进行对比。结果：通过对患者首次摆位与模拟定位射野参数核准时升床高度误差为3～8mm；按医嘱升床及射野参数摆位，射野边界误差为3～9mm。结论：通过模拟定位射野参数摆位与体表标记不符的现象，寻找摆位误差的原因。

Objective： To explore the chest tumor oblique wild first position inconsistent treatment beam parameters, it can improve the positioning accuracy. Methods： The accelerator 40 thoracic tumors oblique field irradiation in patients with the first positioning liter bed radiation field with analog positioning data comparison. Results： Bit analog positioning patients for the first time placed a high degree of error of 3 to 8mm; liter bed when the beam parameters approved by your doctor liter bed and beam parameters anyway, the the beam boundary error in the 5 to 9mm. Conclusion： Positioning the beam parameters by simulating phenomena that are inconsistent with the surface markers positioning, looking for a positioning error.