Quantitative photoacoustic tomography by stochastic search: direct recovery of the optical absorption field

Venugopal, Mamatha and van Es, Peter and Manohar, Srirang and Roy, Debasish and Vasu, Ram Mohan (2016) Quantitative photoacoustic tomography by stochastic search: direct recovery of the optical absorption field. In: OPTICS LETTERS, 41 (18). pp. 4202-4205.

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Abstract

We present, perhaps for the first time, a stochastic search algorithm in quantitative photoacoustic tomography (QPAT) for a one-step recovery of the optical absorption map from time-resolved photoacoustic signals. Such a direct recovery is free of the numerical inaccuracies inherent in conventional two-step approaches that depend on an accurate estimation of the absorbed energy distribution. The absorption profile parameterized as a vector stochastic process is additively updated over time recursions so as to drive the measurement-prediction misfit to a zero-mean white noise. The derivative-free additive update is a welcome departure from the conventional gradient-based methods requiring evaluation of Jacobians at every recursion. The quantitative accuracy of the recovered absorption map from both numerical and experimental data is good with an overall error of less than 10%. (C) 2016 Optical Society of America

Item Type:	Journal Article
Publication:	OPTICS LETTERS
Additional Information:	Copy right for this article belongs to the OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Mechanical Sciences > Civil Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	03 Dec 2016 05:11
Last Modified:	03 Dec 2016 05:11
URI:	http://eprints.iisc.ac.in/id/eprint/55227

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