Self-defocusing in ultrasonic hyperthermia: Experiment and simulation
Self-defocusing in ultrasonic hyperthermia: Experiment and simulation
复制标题
超声热疗中的自散焦：实验与模拟
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. Fink
中科院分区：
文献类型：
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作者：
C. L. Floch;M. Tanter;M. Fink
在利用高强度聚焦超声进行热疗治疗期间，温度升高局部地引起声速的变化，声速的变化本身充当超声波束的畸变器。随着时间的增加，这种热透镜效应可能变得明显，并导致显著的效应，如光束的自散焦。这封信提出了这种效果的实验证据，并提出了一个有限差分模拟的耦合波和热方程，演示了类似的现象。
During hyperthermia treatments with high intensity focused ultrasounds, the temperature elevation locally induces a change of sound speed which acts itself as an aberrator for the ultrasonic beam. Such a thermal lens effect may become noticeable as time increases and leads to significant effects like the self-defocusing of the beam. This letter presents an experimental evidence of this effect, and a finite difference simulation of the coupled wave and heat equations is presented that demonstrates similar phenomenon.