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Proceedings Paper

Patterned interrogation scheme for compressed sensing photoacoustic imaging using a Fabry Perot planar sensor
Author(s): Nam Huynh; Edward Zhang; Marta Betcke; Simon Arridge; Paul Beard; Ben Cox
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Paper Abstract

Photoacoustic tomography (PAT) has become a powerful tool for biomedical imaging, particularly pre-clinical small animal imaging. Several different measurement systems have been demonstrated, in particular, optically addressed Fabry-Perot interferometer (FPI) sensors have been shown to provide exquisite images when a planar geometry is suitable. However, in its current incarnation the measurements must be made at each point sequentially, so these devices therefore suffer from slow data acquisition time. An alternative to this point-by-point interrogation scheme, is to interrogate the whole sensor with a series of independent patterns, so each measurement is the spatial integral of the product of the pattern and the acoustic field (as in the single-pixel Rice camera). Such an interrogation scheme allows compressed sensing to be used. This enables the number of measurements to be reduced significantly, leading to much faster data acquisition. An experimental implementation will be described, which employs a wide NIR tunable laser beam to interrogate the FPI sensor. The reflected beam is patterned by a digital micro-mirror device, and then focused to a single photodiode. To demonstrate the idea of patterned and compressed sensing for ultrasound detection, a scrambled Hadamard operator is used in the experiments. Photoacoustic imaging experiments of phantoms shows good reconstructed results with 20% compression.

Paper Details

Date Published: 3 March 2014
PDF: 5 pages
Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 894327 (3 March 2014); doi: 10.1117/12.2039525
Show Author Affiliations
Nam Huynh, Univ. College London (United Kingdom)
Edward Zhang, Univ. College London (United Kingdom)
Marta Betcke, Univ. College London (United Kingdom)
Simon Arridge, Univ. College London (United Kingdom)
Paul Beard, Univ. College London (United Kingdom)
Ben Cox, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 8943:
Photons Plus Ultrasound: Imaging and Sensing 2014
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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