目的：采用三维治疗计划系统(3d - TPS)模拟计算全身照射(TBI)的剂量分布。

Purpose: Simulating calculation the dose distribution of the total body irradiation (TBI) with three dimension treatment planning system (3d-tps).

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治疗计划系统是伽玛刀的软件，能为临床医生预先规划治疗方案，准确地预见治疗效果从而确保放射治疗的安全性。

To be the software of Gamma Knife, Treatment Planning System (TPS) helps doctor to make treatment plan, predicts the clinical result to ensure the security of radiotherapy.

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方法：使用立体定向治疗计划系统、靶点模拟器、头部定位框架检查各个治疗阶段靶区定位的误差。

METHODS: The stereotactic radiotherapy treatment planning system (SRT TPS), target simulator and head frame were used to check the errors of target localization during each radiation procedure.

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