Diffuse shear wave spectroscopy for soft tissue viscoelastic characterization.

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Rheology

Background:

• Early disease diagnosis is crucial for effective patient treatment.
• Diseases affecting organ stiffness require accurate and timely detection.
• Noninvasive methods are preferred for disease diagnosis and monitoring.

Purpose of the Study:

• To develop and validate a noninvasive, rapid elastography method for detecting diseases impacting organ stiffness.
• To characterize the viscoelastic properties of biological tissues using diffuse fields.
• To assess the feasibility of the technique for clinical applications.

Main Methods:

• Utilized diffuse fields in elastography with a phantom experiment.
• Employed seven vibrators generating white noise (80-300 Hz) to create acoustic fields.
• Tracked waves using an ultrasound probe and Verasonics Vantage System, calculating shear wave velocity via Fourier transforms.

Main Results:

• Quantified viscoelastic parameters (μ and η) from shear wave velocity dispersion.
• Achieved characterization in an acquisition time under one second (300 ms).
• Experimentally determined values (μ = 1.23 ± 0.05 kPa, η = 0.51 ± 0.09 Pa·s) matched expected properties.

Conclusions:

• The developed noninvasive elastography method is rapid and accurate for characterizing tissue viscoelasticity.
• This technique shows promise for early disease detection by assessing organ stiffness.
• The method's consistency was confirmed through repeated experimental trials.