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A micromachined silicon parallel acoustic delay line (PADL) array for real-time photoacoustic tomography (PAT)

Cho, Young and Chang, Cheng-Chung and Wang, Lihong V. and Zou, Jun (2015) A micromachined silicon parallel acoustic delay line (PADL) array for real-time photoacoustic tomography (PAT). In: Photons Plus Ultrasound: Imaging and Sensing 2015. Proceedings of SPIE. No.9323. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 93232Z. ISBN 9781628414134. https://resolver.caltech.edu/CaltechAUTHORS:20180911-133542965

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Abstract

To achieve real-time photoacoustic tomography (PAT), massive transducer arrays and data acquisition (DAQ) electronics are needed to receive the PA signals simultaneously, which results in complex and high-cost ultrasound receiver systems. To address this issue, we have developed a new PA data acquisition approach using acoustic time delay. Optical fibers were used as parallel acoustic delay lines (PADLs) to create different time delays in multiple channels of PA signals. This makes the PA signals reach a single-element transducer at different times. As a result, they can be properly received by single-channel DAQ electronics. However, due to their small diameter and fragility, using optical fiber as acoustic delay lines poses a number of challenges in the design, construction and packaging of the PADLs, thereby limiting their performances and use in real imaging applications. In this paper, we report the development of new silicon PADLs, which are directly made from silicon wafers using advanced micromachining technologies. The silicon PADLs have very low acoustic attenuation and distortion. A linear array of 16 silicon PADLs were assembled into a handheld package with one common input port and one common output port. To demonstrate its real-time PAT capability, the silicon PADL array (with its output port interfaced with a single-element transducer) was used to receive 16 channels of PA signals simultaneously from a tissue-mimicking optical phantom sample. The reconstructed PA image matches well with the imaging target. Therefore, the silicon PADL array can provide a 16× reduction in the ultrasound DAQ channels for real-time PAT.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2080178DOIArticle
ORCID:
AuthorORCID
Wang, Lihong V.0000-0001-9783-4383
Zou, Jun0000-0002-9543-6135
Additional Information:© 2015 Society of Photo-Optical Instrumentation Engineers. This work was supported in part by a grant (CMMI-1131758) from the National Science Foundation to J.Z. and a grant (DP1 EB016986) from the National Institutes of Health to L.V. Wang has a financial interest in Microphotoacoustics, Inc. and in Endra, Inc., which, however, did not support this work.
Funders:
Funding AgencyGrant Number
NSFCMMI-1131758
NIHDP1 EB016986
Subject Keywords:real time, handheld array, photoacoustic tomography, single-crystalline silicon, microfabrication, laser micro-machining, parallel acoustic delay line
Series Name:Proceedings of SPIE
Issue or Number:9323
Record Number:CaltechAUTHORS:20180911-133542965
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180911-133542965
Official Citation:Young Cho, Young Cho, Cheng-Chung Chang, Cheng-Chung Chang, Lihong V. Wang, Lihong V. Wang, Jun Zou, Jun Zou, } "A micromachined silicon parallel acoustic delay line (PADL) array for real-time photoacoustic tomography (PAT)", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 93232Z (11 March 2015); doi: 10.1117/12.2080178; https://doi.org/10.1117/12.2080178
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89524
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Sep 2018 23:10
Last Modified:09 Mar 2020 13:19

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