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Shear wave speed recovery in sonoelastography using crawling wave data.

Kui Lin¹, Joyce McLaughlin, Daniel Renzi

¹Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

The Journal of the Acoustical Society of America

|July 24, 2010

Summary

This summary is machine-generated.

Sonoelastography crawling wave speed imaging can show artifacts. This study identifies artifacts and introduces a new differential equation method to accurately image shear wave speed, a better indicator of tissue stiffness.

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Area of Science:

Medical Imaging
Biophysics
Ultrasound Technology

Background:

Sonoelastography uses crawling wave experiments for real-time shear wave imaging.
Previously, crawling wave speed was used as a proxy for shear stiffness.
Artifacts in crawling wave speed images can misrepresent tissue stiffness.

Purpose of the Study:

To identify and characterize artifacts in sonoelastography crawling wave speed images.
To develop a new method for accurately imaging shear wave speed, a reliable indicator of shear stiffness.

Main Methods:

Crawling wave experiment with two harmonic sources at nearby frequencies.
Extraction of crawling wave phase from spectral variance data.
Development of a differential equation to solve for shear wave speed.
Computation and imaging of shear wave speed on a grid.

Main Results:

Demonstration of artifact locations and shapes in crawling wave speed images.
Establishment of a differential equation enabling accurate shear wave speed imaging.
Validation of shear wave speed as a quantity strongly correlated with shear stiffness change.

Conclusions:

Crawling wave speed imaging in sonoelastography can produce misleading artifacts.
The proposed differential equation method provides accurate shear wave speed imaging.
This advancement improves the reliability of sonoelastography for assessing tissue stiffness.