直线加速器全身照射技术

本文介绍了在直线加速器上实行全身照射的方法，包括治疗床的设计、测量装置的制作、实验参数的测定和照射方法。SSD＝450cm，机架角为270度，患者取侧卧位，前后野和后前野对穿照射，采用分段肺屏蔽办法控制肺的吸收剂量。用多通道半导体剂量仪进行剂量全程监测作为质量控制手段进行质量控制和实现质量保证，用入射表面剂量Din与出射表面剂量Daut之和的一半即（Din Dout)/2作为对应入射方向上体中层面的吸收剂量。

Technique in linearaccelerator total body irradiation

This article describes the physical, technical, and dosimetric aspects of total body irradiation (TBI) that was carried out by using 6MV X-Ray from Varian 2300 C/D Linear Accelerator at a distance of 450 cm from target to the treatment table and at a gantry angle of 270 .The dose to lung tissue was limit by setting the individual lead compensators customized before, and using DPD-510 to monitor the absorbed dose of the reference point the absorbed dose in depth of half of body will be (Din Dmin)/2 after taking treatment in both AP position and PA position.