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.
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Floch et al. (1999) studied this question.
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