Dual-foci detection in photoacoustic computed tomography with coplanar light illumination and acoustic detection: a phantom study

Xiangwei Lin; Chengbo Liu; Jing Meng; Xiaojing Gong; Riqiang Lin; Mingjian Sun; Liang Song

doi:10.1117/1.JBO.23.5.050501

8 May 2018 Dual-foci detection in photoacoustic computed tomography with coplanar light illumination and acoustic detection: a phantom study

Xiangwei Lin, Chengbo Liu, Jing Meng, Xiaojing Gong, Riqiang Lin, Mingjian Sun, Liang Song

Author Affiliations +

Journal of Biomedical Optics, Vol. 23, Issue 5, 050501 (May 2018). https://doi.org/10.1117/1.JBO.23.5.050501

Abstract

A dual-foci transducer with coplanar light illumination and acoustic detection was applied for the first time. It overcame the small directivity angle, low-sensitivity, and large datasets in conventional circular scanning or array-based photoacoustic computed tomography (PACT). The custom-designed transducer is focused on both the scanning plane with virtual-point detection and the elevation direction for large field of view (FOV) cross-sectional imaging. Moreover, a coplanar light illumination and acoustic detection configuration can provide ring-shaped light irradiation with highly efficient acoustic detection, which in principle has a better adaptability when imaging samples of irregular surfaces. Phantom experiments showed that our PACT system can achieve high resolution (∼0.5 mm), enhanced signal-to-noise ratio (16-dB improvement), and a more complete structure in a greater FOV with an equal number of sampling points compared with the results from a flat aperture transducer. This study provides the proof of concept for the fabrication of a sparse array with the dual-foci property and large aperture size for high-quality, low-cost, and high-speed photoacoustic imaging.

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Xiangwei Lin, Chengbo Liu, Jing Meng, Xiaojing Gong, Riqiang Lin, Mingjian Sun, and Liang Song "Dual-foci detection in photoacoustic computed tomography with coplanar light illumination and acoustic detection: a phantom study," Journal of Biomedical Optics 23(5), 050501 (8 May 2018). https://doi.org/10.1117/1.JBO.23.5.050501

Received: 15 January 2018; Accepted: 21 February 2018; Published: 8 May 2018

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