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Parameterized joint reconstruction of the initial pressure and sound speed distributions in photoacoustic computed tomography

Matthews, Thomas Paul and Poudel, Joemini and Li, Lei and Wang, Lihong V. and Anastasio, Mark A. (2018) Parameterized joint reconstruction of the initial pressure and sound speed distributions in photoacoustic computed tomography. In: Photons Plus Ultrasound: Imaging and Sensing 2018. Proceedings of SPIE. No.10494. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 104942V. ISBN 9781510614734. http://resolver.caltech.edu/CaltechAUTHORS:20180907-104552942

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Abstract

Accurate estimation of the initial pressure distribution in photoacoustic computed tomography (PACT) requires some knowledge of the sound speed distribution. However, the sound speed distribution is typically unknown. Further, the initial pressure and sound speed distributions cannot both, in general, be stably recovered from PACT measurements alone. In this work, a joint reconstruction method for the initial pressure distribution and a low-dimensional parameterized model of the sound speed distribution is proposed. By employing a priori information about the structure of the sound speed distribution, both the initial pressure and sound speed can be accurately recovered. The joint reconstruction problem is solved by use of a proximal optimization method that allows constraints and non-smooth regularization functions for initial pressure distribution. The gradients of the cost function with respect to the initial pressure and sound speed distributions are calculated by use of an adjoint state method that has the same per-iteration computational cost as calculating the gradient with respect to the initial pressure distribution alone. This approach is quantitatively evaluated through 2D computer-simulation studies for a small animal imaging model. The impact of the choice of the parameterized sound speed model is investigated. Even when the assumed parameterized sound speed model is inconsistent with the true sound speed distribution, the estimated initial pressure distribution is more accurate than that obtained by assuming a constant sound speed. The utility of the proposed approach is also demonstrated through application to experimental in vivo measurements of a mouse.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2291014DOIArticle
ORCID:
AuthorORCID
Wang, Lihong V.0000-0001-9783-4383
Anastasio, Mark A.0000-0002-3192-4172
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers.
Record Number:CaltechAUTHORS:20180907-104552942
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180907-104552942
Official Citation:Thomas Paul Matthews, Thomas Paul Matthews, Joemini Poudel, Joemini Poudel, Lei Li, Lei Li, Lihong V. Wang, Lihong V. Wang, Mark A. Anastasio, Mark A. Anastasio, } "Parameterized joint reconstruction of the initial pressure and sound speed distributions in photoacoustic computed tomography (Conference Presentation)", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104942V (15 March 2018); doi: 10.1117/12.2291014; https://doi.org/10.1117/12.2291014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89450
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Sep 2018 20:27
Last Modified:10 Sep 2018 20:27

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