A single-pole model for the propagation of ultrasound in soft tissue

摘要: A minimum-phase function, which characterizes the velocity dispersion in tissue was calculated from measured attenuation. This function incorporated into a causal model. Predictions of attenuation using with just single pole matched 1- to 10-MHz range within few percent. Dispersion phase predicted by single-pole model comparable dispersion. The frequency associated pole, is relaxation frequency, decreased hemoglobin concentration and collagen content but increased temperature. electrical equivalent circuit for this delay coupled low-pass filter can be configured as resistance series parallel combination capacitance.