全脑全脊髓照射仰卧位CT模拟定位技术

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

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影像(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。

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.