Three-Dimensional Shear Wave Elastography Using Acoustic Radiation Force and a 2-D Row-Column Addressing (RCA) Array.

Area of Science:

• Ultrasound imaging
• Biomedical engineering
• Medical physics

Background:

• Acoustic radiation force (ARF)-based shear wave elastography (SWE) is a noninvasive ultrasound method for quantitative tissue stiffness measurement.
• Current 2-D ARF-SWE lacks robustness for heterogeneous tissues, and existing 3-D solutions have practical limitations like probe technology and system requirements.
• High channel-count systems and delicate circuitry in previous 3-D ARF-SWE methods hinder clinical applicability.

Purpose of the Study:

• To develop a practical and robust 3-D ARF-SWE method overcoming limitations of existing technologies.
• To enhance the field-of-view (FOV) for SWE imaging using a novel combination of techniques.
• To enable accurate 3-D tissue mechanical property estimation for clinical applications.

Main Methods:

• Proposed a novel 3-D ARF-SWE method utilizing a 2-D row-column addressing (RCA) array with a lower element count (256).
• Integrated the comb-push shear elastography (CUSE) technique with 2-D RCA for improved SWE imaging FOV.
• Conducted in vitro phantom studies and an in vivo study on a breast cancer patient.

Main Results:

• The 2-D RCA array enabled ultrafast imaging volume rates (2000 Hz) and withstood push pulses, addressing key limitations.
• In vitro studies demonstrated robust 3-D SWE performance in homogenous and inclusion phantoms.
• In vivo results successfully reconstructed 3-D elasticity maps of a breast lesion, validated against a commercial ultrasound scanner.

Conclusions:

• The proposed 3-D ARF-SWE method based on 2-D RCA offers a practical and viable solution for clinical 3-D tissue stiffness assessment.
• This advancement has strong potential to improve the characterization of tissue mechanics in 3-D.
• The method overcomes previous technological barriers, paving the way for wider clinical adoption of 3-D SWE.