Reverberation reduction in vibro-acoustography using channel estimation method

Vibro-acoustography (VA) displays the vibroacoustic of the object (tissue) induced by two intersecting ultrasound of different frequencies. VA image of a given object may vary on boundary conditions. Such variations are attributed to reverberation of the sound emanating from the object in the environment of the experiment. This effect can be explained terms of acoustic propagation through multiple paths before the receiving hydrophone. The goal of this study is to reduce image variations caused by the acoustic multipath. Two methods on channel estimation are developed to evaluate the effect of and correct the received acoustic data from the object. The method uses two ultrasound excitation pulses having different for every image location. Another method uses tissue of different excitation amplitudes to remove reverberation measure tissue nonlinearity.