频率,脉冲长度,和机械指标

C. Church
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引用次数: 75

摘要

根据目前的定义,机械指数(MI)仅使用峰值压力和中心频率两个参数。另一个重要因素,脉冲长度(LP)的影响,通过数值计算研究了空化阈值(Pt),类似于MI的分析工作。对于原始阈值准则(最高温度,Tmax=5000 K), LP对Pt的影响很小,但对于常用的最大半径准则,Rmax=2Ro, LP对Pt的影响可能很大。纯机械方法(Rmax)产生的潜在生物效应随着LP的增加而增加,而由声化学物质介导的生物效应(Tmax)则没有。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Frequency, pulse length, and the mechanical index
As currently defined, the mechanical index (MI) uses only two parameters, peak rarefactional pressure and center frequency. The effect of another important factor, the pulse length (LP), was investigated by numerical computations for cavitation threshold (Pt) similar to the analytical work underlying the MI. The effect of LP on Pt is small for the original threshold criterion (maximum temperature, Tmax=5000 K), but can be substantial for the often-used criterion on maximum radius, Rmax=2Ro. The potential for bioeffects produced by purely mechanical means (Rmax) increases with LP, while those mediated by sonochemicals (Tmax) does not.
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