固定具用熱可塑性樹脂シェル材料の基礎的検討

概要

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Fixation of the irradiated part at radiotherapy is an important problem. One solution is the use of a fixation device with a thermo-plastic shell. We studied various thermo-plastic shell materials in order to compare their kinking characteristics. The shell materials examined were Orfit(thickness:2mm), Posicast(thickness:2mm), Uni-frame(thickness:2.4mm), Radicast(thickness:2mm), Shellfitter(thickness:3mm), Thermoshell-S(thickness:3mm) and Thermoshell-P(thickness:3mm). We measured relative dose ratio at the surface and at the calibration point, and the shrinkage ratio of the shell materials after they had hardened. We compared the accuracy of fixation and impressions from test subjects when the various fixation devices were used. Results showed that the surface dose was increased about threefold, and the calibration point dose was decreased 0.6% when the fixation devices were used. The shell materials shrunk about 1% within a few hours after they had become hard. However, there was no difference between materials after that. The mesh-type shells were preferred by the test subjects. Set-up reproduction was dependent on technological precision in shaping and putting on the fixation device. In addition, shell materials should be chosen for the following factors:1) ease of use, 2) comfort for patients, 3) cost of preparation.
公益社団法人日本放射線技術学会の論文
1997-12-20