Volumetric Photoacoustic Imaging with Low-Cost and Easily Fabricated Planar Array Ultrasound Transducers

Mitra, M and Kumar, A and Khandare, S and Gaddale, P and Anandan, Y and Pedibhotla, S and Roy, K and Chen, H and Pratap, R and Kothapalli, S-R (2024) Volumetric Photoacoustic Imaging with Low-Cost and Easily Fabricated Planar Array Ultrasound Transducers. In: Photons Plus Ultrasound: Imaging and Sensing 2024, 28 January 2024through 31 January 2024, San Francisco.

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Abstract

2-D Ultrasound (US) Transducer (2D-UST) arrays facilitate scan-less volumetric photoacoustic imaging (3D-PAI), but are typically high-cost, involve laborious fabrication process, and permit limited scalability in design with respect to array parameters like element count, aperture size, center frequency (f!) and array pitch. In this work, we report a novel, 2-D matrix UST array fabricated on a printed circuit board (PCB) substrate (2D-PCB-UST array) at low-cost and without the need of advanced cleanroom fabrication technologies. Further, the 2D-PCB-UST array parameters can be easily modified with PCB design software. We demonstrate the scalability by fabricating two arrays, (i) an 8x8 array with 1.5 mm pitch and f! 40 MHz, and (ii) an 4x4 array with 1.2 mm pitch and f! 11 MHz. Initial characterization results demonstrate wideband PA receive sensitivity, characterized by the 6-dB fractional bandwidth for both low and high frequency UST arrays. Phantom imaging results demonstrate 3D-PAI capabilities despite low element count and sparse array geometry. © 2024 SPIE.

Item Type:	Conference Paper
Publication:	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Publisher:	SPIE
Additional Information:	The copyright for this article belongs to SPIE.
Keywords:	Bandwidth; Costs; Fabrication; Photoacoustic effect; Photons; Polyamideimides; Printed circuit boards; Substrates; Ultrasonic transducers, 3-D photoacoustic imaging; Array fabrication; Low-costs; Photo-acoustic imaging; Planar arrays; Planar ultrasound transducer array fabrication; Printed circuit board-based ultrasound transducer; Ultrasound transducer arrays; Ultrasound transducers; Volumetrics, Scalability
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	12 Aug 2024 05:54
Last Modified:	12 Aug 2024 05:54
URI:	http://eprints.iisc.ac.in/id/eprint/85263

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