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Reverberant optical coherence elastography using multifocal acoustic radiation force.

Taye Mekonnen, Alexander W Schill, Christian Zevallos-Delgado

|June 1, 2023

Summary

We developed a multifocal acoustic radiation force source using ultrasound and 3D-printed lenses for enhanced reverberant optical coherence elastography (Rev-OCE). This system achieves high-resolution mechanical property probing in phantoms.

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Area of Science:

Biomedical Optics
Acoustic Physics
Medical Imaging

Background:

Reverberant optical coherence elastography (Rev-OCE) offers high-resolution mechanical property assessment.
Current methods for generating shear waves in Rev-OCE can be limited in spatial control and efficiency.

Purpose of the Study:

To introduce a novel multifocal acoustic radiation force source for Rev-OCE.
To enhance the spatial distribution of acoustic energy for improved shear wave generation.
To demonstrate high-resolution mechanical probing capabilities.

Main Methods:

A multifocal acoustic radiation force source was designed, integrating an ultrasound transducer with a 3D-printed acoustic lens array.
Plano-concave acoustic lenses (11.8 mm aperture) spatially distributed 1 MHz ultrasound energy to create multiple focal spots.
Optical coherence tomography (OCT) detected the resulting reverberant shear wave fields.

Main Results:

The system successfully generated multiple focal spots on the target plane.
Reverberant shear wave fields were effectively produced and detected by the OCT system.
High-resolution probing of mechanical properties was demonstrated in layered gelatin phantoms.

Conclusions:

The developed multifocal acoustic radiation force source is effective for Rev-OCE applications.
This approach enables precise spatial control of acoustic energy for shear wave generation.
The system shows promise for advanced biomechanical characterization with high resolution.