We have investigated the relationship between stone size and stone comminution (SC) in shock wave lithotripsy (SWL). Begostone phantoms of cylindrical shape in 4-, 7- and 10-mm size (W × H) groups were prepared with appropriately equal total mass (i.e., 1.5 g) in a tube holder and treated in an electromagnetic shock wave lithotripter field at various locations and doses. The results reveal a close correlation between SC and the average peak pressure, P_(+(avg)), incident on the stone among differnet size groups. The P_(+(avg)) threshold to initiate stone fragmentation and the slope of SC vs ln (P_(+(avg))) curve in water were found to increase with decreased stone size. In 1,3-butanediol where cavitation is suppressed, the P_(+(avg)) threshold was found to be similar to the value in water yet the slope of the SC curve was significantly reduced at decreased stone size. Altogether, these results demonstrate a clear dependency of the P_(+(avg)) threshold and rate of SC on stone size, as well as the importance of cavitation in producing efficiency stone comminution during SWL.
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机译：我们已经调查了冲击波碎石（SWL）中石材尺寸和石头粉碎（SC）之间的关系。在4-，7-和10毫米尺寸（W×H）组中的圆柱形状的Begostone族在管架中具有适当的总质量（即，1.5g），并在各种电磁冲击波碎石机场处理地点和剂量。结果揭示了SC与平均峰值压力的紧密相关性，P _（+（AVG）），在不同的尺寸组中入射在石头上。发现阈值以启动石头碎片和SC VS LN的斜率（P _（+（+（AVG）））曲线随着石材尺寸的降低而增加。在抑制空化的1,3-丁丹二醇中，发现P _（+（AVG））阈值与水中的值类似，但在降低的石材尺寸下，SC曲线的斜率显着降低。总共，这些结果表明了P _（+（AVG））阈值和SC对石材尺寸的阈值以及SC的重要性，以及在SWL期间生产效率石粉碎的重要性。
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