Moving beam technique ill performing total body irradiati 〔 冫 n ( TBI ) , which sweeps the X − ray beam completely over the whole body axis , is a useful technique for small treatment rQom ill our hospital . However , honiesTellous dose distributions for [ }atient calmot be obtained without changing the output during gantry rotation . We developed a meth 〔,d for ebtaining a homogenous dose distribution by changing the software of the control ullit of the linac without any change in the

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... tion of the machine . The change of output / degree and 〆 or the 且eld width at each gantry angle can be automatically calculated by our method , the result , homogenous dose of ± 3% at the referellce plane was obtained in treating a useful length of 200 cm , From this study , though the results are still prelilnillary , our method might be pr { )mising in performing TBI .