An initial study of complete 2D shear wave dispersion images using a reverberant shear wave field

Title

An initial study of complete 2D shear wave dispersion images using a reverberant shear wave field

Creator

Ormachea J; Parker K J; Barr R G

Publisher

Physics in Medicine and Biology

Date

2019
2019-07

Description

Within the field of elastography, a relatively new approach analyzes the limiting case of shear waves established as a reverberant field. In this framework, it is assumed that a distribution of shear waves exists, oriented across all directions in 3D and continuous in time. The simultaneous multi-frequency application of reverberant shear wave fields can be accomplished by applying an array of external sources that can be excited by multiple frequencies within a bandwidth, for example 50, 100, 150, ..., 500 Hz, all contributing to the shear wave field produced in the liver or other target organ. This enables the analysis of the dispersion of shear wave speed as it increases with frequency, indicating the viscoelastic and lossy nature of the tissue under study. Furthermore, dispersion images can be created and displayed alongside the shear wave speed images. We report preliminary studies on breast and liver tissues using the multi-frequency reverberant shear wave technique, employing frequencies up to 700 Hz in breast tissue, and robust reverberant patterns of shear waves across the entire liver and kidney in obese patients. Dispersion images are shown to have contrast between tissue types and with quantitative values that align with previous studies.

Subject

benign; clinical-use; deep; Diagnosis; elastography; Engineering; Nuclear Medicine & Medical Imaging; Radiology; recommendations; reverberant shear wave field; shear dispersion; shear elastography; soft; tissue; tissue viscoelasticity; viscoelasticity; wfumb guidelines

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Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

12-12

Issue

14

Volume

64

Citation

Ormachea J; Parker K J; Barr R G, “An initial study of complete 2D shear wave dispersion images using a reverberant shear wave field,” NEOMED Bibliography Database, accessed January 21, 2021, https://neomed.omeka.net/items/show/6481.

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