| 摘要 |
This invention provides a novel applicator system for brachytherapy of the uterine cervix which overcomes the problems of the prior art. In particular, this invention provides a Fletcher-like system having an attenuation effect functionally similar to previous applicators, but produced in a smaller sized applicator by a novel arrangement of high and low density metals. The applicator system according to the present invention is constructed so that radiation from the source must transit high density material obliquely to reach the protected tissue, traversing a greater distance in the high density material of the applicator system, with resultant greater attenuation of the radiation for a given amount of high density material. Thus, a far lesser radial extent of highly attenuating material is needed to attain the desired attenuation, and the size of the applicator can be far smaller.
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