Download PDF WAVE PROPAGATION THEORIES AND APPLICATIONS by Yi Zheng

Sinopsis

Studies have found that shear moduli, having the dynamic range of several orders of magnitude for various biological tissues [1], are highly correlated with the pathological statues of human tissue such as livers [2, 3]. The shear moduli can be investigated by measuring the attenuation and velocity of the shear wave propagation in a tissue region. Many efforts have been made to measure shear wave propagations induced by different types of force, which include the motion force of human organs, external applied force [4], and ultrasound radiation force [5].

In past 15 years, ultrasound radiation force has been successfully used to induce tissue motion for imaging tissue elasticity. Vibroacoustography (VA) uses bifocal beams to remotely induce vibration in a tissue region and detect the vibration using a hydrophone [5]. The vibration center is sequentially moved in the tissue region to form a two-dimensional image. Acoustic Radiation Force Imaging (ARFI) uses focused ultrasound to apply localized radiation force to small volumes of tissue for short durations and the resulting tissue displacements are mapped using ultrasonic correlation based methods [6]. Supersonic shear image remotely vibrates tissue and sequentially moves vibration center along the beam axis to create intense shear plan wave that is imaged at a high frame rate (5000 frames per second) [7]. These image methods provide measurements of tissue elasticity, but not the viscosity.

Content

1. Shear Wave Propagation in Soft Tissue and Ultrasound Vibrometry
2. Acoustic Wave Propagation in a Pulsed Electro Acoustic Cell
3. Tsunami Wave Propagation
4. Electromagnetic Waves and Their Application to Charged Particle Acceleration
5. Radio Wave Propagation Phenomena from GPS Occultation Data Analysis
6. RadioWave Propagation Through Vegetation
7. Analyzing Wave Propagation in Helical Waveguides Using Laplace, Fourier, and Their Inverse Transforms, and Applications
8. Transient Responses on Traveling-Wave Loop Directional Filters
9. Ray Launching Modeling in Curved Tunnels with Rectangular or Non Rectangular Section
10. Electromagnetic Wave Propagation Modeling for Finding Antenna Specifications and Positions in Tunnels of Arbitrary Cross-Section
11. Efficient CAD Tool for Noise Modeling of RF/Microwave Field Effect Transistors
12. A Numerical Model Based on Navier-Stokes Equations to Simulate Water Wave Propagation with Wave-Structure Interaction
13. Wave Iterative Method for Electromagnetic Simulation
14. Wavelet Based Simulation of Elastic Wave Propagation

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