全脑全脊髓照射仰卧位CT模拟定位技术

目的：探讨全脑全脊髓照射仰卧位CT模拟定位技术。方法：7名患者分别躺在真空负压袋固定器上，进行CT模拟定位，打印正侧位数字重建射线彩像（DRR）图，放射治疗前拍摄正侧位定位验证片，测量解剖参考点和射野边界之间的距离。结果：患者左右方向及背腹方向误差在2mm以内。人体上下方向误差在4mm以内；放疗后，患者受照射的皮肤部位均出现色素沉着。结论：仰卧位全脑全脊髓照射CT模拟定位技术可用于俯卧位不合作的患者。

Location Technology of Radiotherapy for All of the Brain and Spine with Supine Position by CT Simulation

Objective:To study the location technology of radiotherapy for all of the brain and spine with supine position CT simulation.Methods:7 patients lied on the vacuum bag immobilization to operate CT simulation,the digitally reconstructed radiographs in anterior-posterior and lateral view were prined.The films in anterior-posterior and lateral view were taken before radiotherapy.The films were compared with the digitally reconstructed radiographs.Results:The set-up errors in left-right and anterior-posterior vector were less than 2 mm,the set-up errors in up-low were less than 4mm.The skin irradiated was pigmentation after radiotherapy.Conclusions:CT simulation technology of radiotherapy for all of the brain and spine with supine position is feasible for the patients who can not be prone position during irradiation.