原体照射法による定位的放射線照射の線量分布の検討

概要

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Current stereotactic irradiation techniques with high-energy photon beams are based either on gamma units that use 201 stationary cobalt beams or on isocentric linear accelerators. The techniques using linear accelerators are divided into multiple non-coplanar techniques and others, all of which have their respective physical characteristics, such as precision of dose convergence and isodose distribution. Conformational stereotactic irradiation was developed in order to improve the precision of dose convergence, and we compared isodose distributions to conventional multiple shots of stereotactic irradiation by the film method using a globular Mix-Dp phantom with a diameter of 20cm. Results were as follows:(1) isodose distribution was shown as curved lines with conformational stereotactic irradiation, rather than the simple ovals with multiple-isocenter stereotactic irradiation;(2) the precision of dose convergence of simple shaped conformational stereotactic irradiation was equal to that of multiple-isocenter stereotactic irradiation;(3) the possibility existed of deterioration of the precision of dose convergence according to complex shaped conformational stereotactic irradiation.
公益社団法人日本放射線技術学会の論文
2001-02-20