An optically-transparent PVDF transducer array for photoacoustic tomography

He Hu; Cheng Fang; Jun Zou

doi:10.1117/12.2609268

3 March 2022 An optically-transparent PVDF transducer array for photoacoustic tomography

He Hu, Cheng Fang, Jun Zou

Author Affiliations +

Proceedings Volume 11960, Photons Plus Ultrasound: Imaging and Sensing 2022; 119601B (2022) https://doi.org/10.1117/12.2609268
Event: SPIE BiOS, 2022, San Francisco, California, United States

Abstract

Photoacoustic tomography (PAT) is a hybrid imaging technique, which is capable of providing abundant optical contrast and high spatial resolution at deep penetration depth. One fundamental challenge in current PAT system design is caused by the opaque structure of the ultrasound transducer arrays, which prevents effective light energy delivery onto the imaging target. To address this issue, we report a new optically-transparent PVDF (polyvinylidene fluoride) transducer array for PAT. It consists of a 1D array of 16 elements, each of which has a transparent window to allow the excitation laser pulses to directly pass through. As a result, the optical excitation and ultrasound detection zones are automatically aligned to improve the illumination condition and PA excitation efficiency. Its imaging performance, such as contrast, lateral resolution, and penetration depth has been characterized with optical phantoms. Preliminary ex-vivo PAT experiments on chicken breast tissues have been conducted to demonstrate its imaging capability on real biological samples. The experimental results show that the optically-transparent PVDF transducer array could provide a new solution for the miniaturization and clinical translation of handheld PAT systems.

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He Hu, Cheng Fang, and Jun Zou "An optically-transparent PVDF transducer array for photoacoustic tomography", Proc. SPIE 11960, Photons Plus Ultrasound: Imaging and Sensing 2022, 119601B (3 March 2022); https://doi.org/10.1117/12.2609268

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KEYWORDS

Transducers

Ferroelectric polymers

Acquisition tracking and pointing

Optical arrays

Breast

Ultrasonography

Tissue optics

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