Compensation for acoustic heterogeneities in photoacoustic computed tomography using a variable temporal data truncation reconstruction method

Joemini Poudel; Thomas P. Matthews; Mark A. Anastasio; Lihong V. Wang

doi:10.1117/12.2213416

15 March 2016 Compensation for acoustic heterogeneities in photoacoustic computed tomography using a variable temporal data truncation reconstruction method

Joemini Poudel, Thomas P. Matthews, Mark A. Anastasio, Lihong V. Wang

Author Affiliations +

Proceedings Volume 9708, Photons Plus Ultrasound: Imaging and Sensing 2016; 97083W (2016) https://doi.org/10.1117/12.2213416
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

Photoacoustic computed tomography (PACT) is an emerging computed imaging modality that exploits optical contrast and ultrasonic detection principles to form images of the absorbed optical energy density within tissue. If the object possesses spatially variant acoustic properties that are unaccounted for by the reconstruction algorithm, the estimated image can contain distortions. While reconstruction algorithms have recently been developed for compensating for this effect, they generally require the objects acoustic properties to be known a priori. To circumvent the need for detailed information regarding an objects acoustic properties, we have previously proposed a half-time reconstruction method for PACT. A half-time reconstruction method estimates the PACT image from a data set that has been temporally truncated to exclude the data components that have been strongly aberrated. In this approach, the degree of temporal truncation is the same for all measurements. However, this strategy can be improved upon it when the approximate sizes and locations of strongly heterogeneous structures such as gas voids or bones are known. In this work, we investigate PACT reconstruction algorithms that are based on a variable temporal data truncation (VTDT) approach that represents a generalization of the half-time reconstruction approach. In the VTDT approach, the degree of temporal truncation for each measurement is determined by the distance between the corresponding transducer location and the nearest known bone or gas void location. Reconstructed images from a numerical phantom is employed to demonstrate the feasibility and effectiveness of the approach.

Citation Download Citation

Joemini Poudel, Thomas P. Matthews, Mark A. Anastasio, and Lihong V. Wang "Compensation for acoustic heterogeneities in photoacoustic computed tomography using a variable temporal data truncation reconstruction method", Proc. SPIE 9708, Photons Plus Ultrasound: Imaging and Sensing 2016, 97083W (15 March 2016); https://doi.org/10.1117/12.2213416

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