ESWL における衝撃波フォーカッシング特性水中放電方式と電磁振動膜方式との比較

概要

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The second focus size and distribution of relative pressure were measured with different type shock wave lithotriptors, Dornier MPL-9000 (electrode spark gap type) and Storz Modulith SL-20 (electromagnetic type). The second focus was visualized using Prescale (paper for measuring pressure) and computer graphics. This method was allowed to measure the distribution of the pressure in the second focus when released shock wave was single. Our study showed that in the electrode spark gap type spatial reproductivity of second focus was changed depending on the numbers of released shock wave however in the electromagnetic type it did not depending on the number of released shock waves. In the electrode spark gap type, pressure distribution in the second focus depended on the electrode gap distance which was changed by discharged voltage and the number of released shock wave. In the electromagnetic type, pressure distribution in the second focus was changed only by the energy level, but not by the numbers of released shock waves. Clinically, it would be considered that it was important to know these changes of second focus, so that the stones could be crushed more effectively.
公益社団法人日本放射線技術学会の論文
1994-01-01