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Enhancement of sonodynamic tissue damage production bysecond-harmonic superimposition: theoretical analysis of its mechanism

机译:次谐波叠加增强声动力组织损伤的产生:其机理的理论分析

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Among the nonthermal effects of ultrasound, acoustic cavitationnmay have the highest potential for therapeutic applications if it can bensomehow controlled. Recent in vitro and in vivo experiments havendemonstrated that sonochemically active cavitation can be enhanced annorder of magnitude by superimposing the second harmonic onto thenfundamental in insonation. Moreover, they have shown that sonochemicallynactive cavitation can be controlled with relative ease, thereby even inna progressive wave field. The effect of second-harmonic superimpositionnon the rectified diffusion through the gas-liquid interface of cavitatednmicrobubbles is estimated theoretically. The theoretical rectifiedndiffusion rate explained an asymmetric behavior of the threshold fornproducing sonodynamic tissue damage as a function of the fundamental andnthe second-harmonic amplitudes. The tissue damage was produced with anfocused progressive wave in a liver lobe of a mouse administered with ansonodynamically active agent. The result suggests that the accelerationnof the rectified diffusion is a primary mechanism of the enhancement ofnsonodynamically effective cavitation by second-harmonic superimposition
机译:在超声的非热效应中,如果能够以某种方式控制声空化,则在治疗应用中可能具有最高的潜力。最近的体外和体内实验表明,通过将二次谐波叠加到随后的共振中,可以将声化学活性的空化增强一个数量级。而且,他们已经表明,可以相对容易地控制声化学非空化作用,从而甚至可以控制渐进波场。从理论上估计了二次谐波叠加对空化微气泡在气液界面上的整流扩散的影响。理论上的整流扩散率解释了产生声动力学组织损伤的阈值的不对称行为是基本和第二谐波振幅的函数。组织损伤是由给予了超声动力活性剂的小鼠的肝叶中的聚焦渐进波产生的。结果表明,整流扩散的加速是二次谐波叠加增强声动力学有效空化的主要机制。

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