NONLINEAR DERATING OF HIGH-INTENSITY THERAPEUTIC ULTRASOUND BEAMS USING GAUSSIAN MODAL SUMS

摘要

The nonlinear derating algorithm presented in this paper shows promise for converting pressure amplitudes measured in water to tissue values, which are much more difficult to measure. The fundamental equation, Eq. (3), can be applied without a Gaussian assumption, and will be applied next to non-Gaussian beams. This application will be performed next. Finally, the technique requires experimental confirmation, in which the modal amplitudes in water will be determined using hydrophone measurements of the time trace followed by an FFT. Derated pressure waveforms will be compared with waveforms determined by sensors implanted in tissue phantoms or ex-vivo tissue samples.