A method for reducing multipath artifacts in ultrasonic computed tomography

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Abstract
Estimates of ultrasonic attenuation based on 1st-order or moment spectral estimators are often confused by multipath propagation effects. The magnitude of error in attenuation estimates due to multipath for the frequency shift technique is described. A parametric model of multipath propagation effects on the frequency spectrum is introduced and an optimization technique is used to estimate the coefficients of the model. The attenuation estimation performances of the model estimation technique, the frequency shift technique and a cepstral liftering technique are compared.