Hyperthermia Therapy Using Acoustic Phase

Conclusion

We have shown numerically that, in a medium with attenuation, heat induced by acoustic focusing leads to refraction of acoustic waves and disturbs the focus. The effect observed at the focus is either a self-focusing or a self-defocusing of the acoustic beam depending on the sign of $\frac{{dc}} {{dT}}$ in the medium. We have proposed a procedure to maintain focus in the zone of interest using phase-conjugation invariance properties.