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Related Experiment Video

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Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation

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Published on: January 27, 2023

Estimating axial and lateral strain using a synthetic aperture elastographic imaging system.

Sanghamithra Korukonda¹, Marvin M Doyley

¹Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, NY 14627, USA.

Ultrasound in Medicine & Biology

|October 4, 2011

Summary

This study shows that synthetic aperture ultrasound elastography can improve lateral displacement estimation. Satisfactory axial and lateral strain elastograms were achieved with fewer active transmission elements.

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Area of Science:

Medical Imaging
Biomedical Engineering
Ultrasound Technology

Background:

Model-based elastography is crucial for diagnosing cancers and imaging vascular tissues.
Current ultrasound elastography is limited by precise axial displacement measurement.
Improving lateral displacement accuracy is key for broader clinical adoption.

Purpose of the Study:

To evaluate the impact of lateral sampling frequency, beam-width, and active transmission elements on ultrasound elastogram quality.
To assess the feasibility of using synthetic aperture ultrasound for enhanced elastography.
To determine optimal parameters for generating high-quality axial and lateral strain elastograms.

Main Methods:

Elastographic imaging was performed on gelatin phantoms using a modified commercial ultrasound scanner.
Radio-frequency echo frames were reconstructed using synthetic aperture data with varying parameters.
Axial and lateral strain elastograms were computed from displacement estimations.

Main Results:

Elastogram quality improved with higher applied strain and A-line density.
Increased lateral beam-width and reduced active transmission elements degraded elastogram quality.
Synthetic aperture systems significantly reduced variance in lateral displacement estimation.

Conclusions:

Synthetic aperture ultrasound imaging enhances the quality of lateral displacement estimation in elastography.
High-quality axial and lateral strain elastograms are achievable with sparse arrays using as few as 16 active transmission elements.
This technique holds promise for improving diagnostic capabilities in medical ultrasound.