2-D Ultrasound Shear Wave Elastography With Multi-Sphere-Source External Mechanical Vibration: Preliminary Phantom...

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Ultrasound Technology

Background:

• Ultrasound shear wave elastography (SWE) is an emerging non-invasive imaging technique for tissue characterization.
• External mechanical vibration (EMV) is gaining interest for shear wave generation in SWE due to its cost-effectiveness and portability compared to acoustic radiation force impulse (ARFI).

Purpose of the Study:

• To propose and validate a novel EMV concept using multiple spherical sources for shear wave generation in SWE.
• To develop and evaluate two design embodiments: a bench test design and a clinically deployable design.
• To compare the performance of the EMV approach against a commercial ARFI-based system.

Main Methods:

• Development of an EMV system with reconfigurable multiple spherical sources.
• Construction of a bench test design for proof of concept and a clinically deployable design.
• Experimental validation using elasticity phantoms and comparison with a commercial ARFI elastography technology (ElastQ).

Main Results:

• The EMV designs successfully generated shear waves and reconstructed elasticity with performance comparable to commercial ARFI technology.
• EMV induced local displacement amplitudes approximately 10 times greater than ARFI at the same depth.
• The multi-configuration EMV design enables exploration of advanced elastography methods, including anisotropic elasticity.

Conclusions:

• The proposed EMV concept provides a viable and potentially superior alternative for shear wave generation in ultrasound elastography.
• The developed designs demonstrate feasibility for both research and clinical applications.
• EMV's enhanced displacement amplitude and multi-configuration capability open new avenues for advanced elastography.