Numerical modeling of ultrasound beam forming in elastic medium

Numerical Approximation of Viscoelastic Flows in an Elastic Medium

We study the numerical approximation of a flow problem governed by a viscoelastic model coupled with a one-dimensional elastic structure equation. A variational formulation for flow equations is developed based on the Arbitrary Lagrangian-Eulerian (ALE) method and stability of the time discretized system is investigated. For decoupled numerical algorithms we consider both an explicit scheme of ...

Multiplierless sigma-delta modulation beam forming for ultrasound nondestructive testing

Beamforming techniques based on sigma-delta modulation (SDM) have been proposed to reduce the hardware complexity of conventional multi-bit digital delay-sum beamformer, in which beamforming operation is performed upon over-sampled single bit sequences obtained by applying SDM to the received signals from each array elements. In conventional single bit SDM beamforming, the single bit sequence i...

Analytical vibroacoustic modeling of an elastic Rayleigh beam using Green's function

The purpose of this article is to provide an analytical model of the vibroacoustic for an elastic beam submerged in low subsonic flows with mean velocities. In general, vibroacoustic modeling refers to the combined effects of sound propagation and mechanical vibration of the structure. Sound radiations from submerged structures are coupled with physical phenomena because the sound pressures act...

Forward Modeling of Ultrasound Propagation in Layered Medium

Modeling and Analysis of Ultrasound Propagation in Layered Medium

For many medical applications of ultrasonic devices, it is often of interest to determine the distortion of ultrasound waves due to tissue layers of fat and muscle. Bending of the acoustic rays due to refraction at intermediate layers degrades image resolution, causes distortion and other artifacts in ultrasound images. In this work, ultrasound propagation in layered media is modeled analytical...