Shear modulus imaging by direct visualization of propagating shear waves with phase-sensitive optical coherence...

Area of Science:

• Biomedical Engineering
• Optical Physics
• Materials Science

Background:

• Accurate mapping of mechanical properties like shear modulus is crucial for diagnosing and understanding biological tissues.
• Existing methods for mechanical property assessment may lack sufficient resolution or depth-specificity.

Purpose of the Study:

• To develop and validate an integrated method for high-resolution, depth-resolved shear modulus mapping in biological tissues.
• To combine low-frequency mechanics with advanced optical imaging for non-invasive mechanical property assessment.

Main Methods:

• Utilized phase-sensitive optical coherence tomography (PhS-OCT) to track induced shear waves in biological tissues.
• Employed low-frequency mechanical actuation to generate shear waves.
• Calculated local shear modulus from shear wave speed measurements obtained via PhS-OCT.

Main Results:

• The PhS-OCT system achieved a high equivalent frame rate of ~47 kHz with high spatial resolution.
• Demonstrated accurate mapping of shear modulus in tissue-mimicking phantoms.
• Validated the capability of the integrated method for quantitative mechanical property imaging.

Conclusions:

• The proposed integrated method effectively maps the shear modulus of biological tissues.
• PhS-OCT provides a powerful tool for dynamic mechanical wave imaging with high fidelity.
• This technique holds potential for advanced biomedical diagnostics and research.