FIG. 3.

Simulation of the scattered frequency spectrum of a single hGV in response to an amplitude modulation and pulse inversion sequence. (a) Simulated spectrum from an amplitude modulation pulse sequence comprising one full-amplitude (380 kPa peak positive) and two subtracted half-amplitude (190 kPa peak positive) 6-cycle sine-bursts at 11.4 MHz. (b) Simulated spectrum form a pulse inversion sequence comprising the sum of two phase-inverted 6-cycle sine-bursts at 380 kPa peak positive amplitude and 11.4 MHz. The frequency spectra are normalized Fourier transforms of the scattered pressure computed from changes in the simulated effective radius of the GVs.