Freehand ultrasound elastography with a 3-D probe

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Ultrasound Technology

Background:

• Traditional ultrasound elastography is often limited to 2-D imaging.
• Real-time 3-D strain visualization is crucial for accurate tissue characterization.

Purpose of the Study:

• To develop and demonstrate the first near-real-time freehand 3-D ultrasound elastography system.
• To extend 2-D elastography techniques to a full 3-D implementation.

Main Methods:

• Utilized a 3-D mechanical ultrasound probe for data acquisition.
• Implemented 3-D windows for displacement tracking in all directions.
• Employed 3-D kernels for least-squares gradient estimation and normalized axial strain calculation.

Main Results:

• Achieved near-real-time acquisition (2 seconds) and 3-D strain volume generation (20 seconds).
• Demonstrated successful extension of 2-D elastography performance to 3-D in-vitro and in-vivo data.
• Produced fast, high-resolution 3-D images of normalized axial strain.

Conclusions:

• The developed system successfully proves the concept of near-real-time 3-D ultrasound elastography.
• The approach shows promise for improved accuracy and visualization in tissue mechanics assessment.