Study Of Nonlinear Acoustic Field Of High Intensity Focused Ultrasound Based On The Fractional Wave

The acoustic energy distribution of High-Intensity Focused Ultrasound (HIFU) is influenced by the attenuation and the dispersion of the biological tissue. In this paper we modified the KZK equation based on the fractional wave equation, in order to accurately describe the sound field of HIFU. The theoretical and experimental studies of frequency dependences of attenuation and sound speed examine the validity of the fractional wave equation. Furthermore, the numerical simulation of HIFU field is performed using the modified KZK equation. Results demonstrate that we can describe the distribution of ultrasound field in the organization more accurately with the systematic consideration of biological tissue’s attenuation and dispersion and improve the safety of HIFU treatment.