Cavitation bubbles have aroused mush attention for their significant promise in ultrasonic contrast imaging, targeted therapy and monitoring of high-intensity focused ultrasound (HIFU) therapy. In this paper, a model using a dual-frequency driving pressure for subharmonics generation from cavitation bubbles is constructed. By calculation of the Fourier transformation to the Keller-Milksis equation, we show that bubbles with appropriate radii produce significant subharmonic components within backscatter spectrum. In contrast to the case of single-frequency driving pressure, subharmonics at dual...
