The effect of stone size on comminution efficiency in shock wave lithotripsy
© 2017 Author(s). 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 x 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.
Zhang, Y; Concha, D; Zhong, P
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International Standard Book Number 13 (ISBN-13)
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