子宮頸癌の放射線治療における照射精度

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The accuracy of the irradiation technique used in radiotherapy for cancer of the uterine cervix was studied by in vitro and in vivo dosimetry. Radical radiation treatment for cancer of the uterine cervix was performed by external irradiation using a dose of 60 Gy of high-energy X-rays (10 MV) with the conformation hollow-out technique, and an additional 24 Gy of cobalt-60 y-rays given by intracavitary irradiation with the high-dose-rate remote afterloading technique. As post-operative irradiation therapy, 40 Gy of high-energy X-rays (10 MV) was used irradiated with the two opposed portal technique. The accuracy of the irradiation procedure is considered to be influenced by the following 3 factors ; physical factors (the accuracy of the dosimeter, clinical dosimetry, maintenance of therapeutic apparatus, etc.), radiotherapy planning (the dose-calculating accuracy of the computer, etc.) and the patients condition (patient positioning, weight loss, etc.).In the case of the conformation hollowワut technique, the accuracy was influenced by ±8 5% for in vivo dosimetry, while that for the two opposed portal technique was ±7.7%. The accuracies of these methods by in vivo dosimetry were :±7% and ±6% respectively. The aboveワbtained values for the accuracy were in relative agree. In the case of intra-cavitary irradia-tion, the irradiation accuracy shown by in vitro dosimetry for physical factors and radiotherapy planning was ±4.4%, while that for intra-rectal in vivo dosimetry was from ±20% to -10%.
公益社団法人日本放射線技術学会の論文
1986-03-01

子宮頸癌の放射線治療における照射精度

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