A multifocal acoustic lens-transducer system for reverberant optical coherence elastography

Taye Mekonnen; Alexander W. Schill; Christian Zevallos-Delgado; Manmohan Singh; Salavat R. Aglyamov; Kirill V. Larin

doi:10.1117/12.2650633

27 March 2023 A multifocal acoustic lens-transducer system for reverberant optical coherence elastography

Taye Mekonnen, Alexander W. Schill, Christian Zevallos-Delgado, Manmohan Singh, Salavat R. Aglyamov, Kirill V. Larin

Proceedings Volume 12381, Optical Elastography and Tissue Biomechanics X; 123810B (2023) https://doi.org/10.1117/12.2650633
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

Reverberant optical coherence elastography (RevOCE) relies on multiple external excitation sources, such as mechanical actuators or vibrators, to produce random waves propagating in arbitrary directions. In this work, a preliminary study on acoustic beam manipulation to produce multi-focal acoustic radiation force is introduced using a planar ultrasound transducer and a 3D-printed acoustic lens array for RevOCE. An unfocused acoustic beam generated by an ultrasound transducer with 1 MHz central frequency and 38-mm element diameter was coupled to seven uniformly distributed acoustic focusing lenses. The spatial distribution of the acoustic field at the focal plane was measured with a needle hydrophone. The effectiveness of the system in generating reverberant shear wave fields was assessed by performing RevOCE imaging of tissue-mimicking gelatin phantoms. The multi-focus acoustic lens-transducer system was coupled with a phase-sensitive optical coherence tomography (PhS-OCT) system. The RevOCE measurement was conducted by sending ten cycles of a tone burst at 2 kHz. The measured acoustic pressure field showed that the array of concave spherical acoustic lenses spatially distributed the acoustic energy into multiple focal spots in the desired focal plane. Furthermore, RevOCE imaging in tissue-mimicking phantom indicated the effectiveness of the acoustic lens-transducer system in inducing reverberant shear wave fields for probing mechanical properties.

Conference Presentation

Citation Download Citation

Taye Mekonnen, Alexander W. Schill, Christian Zevallos-Delgado, Manmohan Singh, Salavat R. Aglyamov, and Kirill V. Larin "A multifocal acoustic lens-transducer system for reverberant optical coherence elastography", Proc. SPIE 12381, Optical Elastography and Tissue Biomechanics X, 123810B (27 March 2023); https://doi.org/10.1117/12.2650633

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available