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Acoustic-speed correction of photoacoustic tomography by ultrasonic computed tomography based on optical excitation of elements of a full-ring transducer array

Xia, Jun and Huang, Chao and Maslov, Konstantin and Anastasio, Mark A. and Wang, Lihong V. (2014) Acoustic-speed correction of photoacoustic tomography by ultrasonic computed tomography based on optical excitation of elements of a full-ring transducer array. In: Photons Plus Ultrasound: Imaging and Sensing 2014. Proceedings of SPIE. No.8943. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 89432G. ISBN 9780819498564. http://resolver.caltech.edu/CaltechAUTHORS:20180912-103856411

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Abstract

Photoacoustic computed tomography (PACT) is a hybrid technique that combines optical excitation and ultrasonic detection to provide high resolution images in deep tissues. In the image reconstruction, a constant speed of sound (SOS) is normally assumed. This assumption, however, is often not strictly satisfied in deep tissue imaging, due to acoustic heterogeneities within the object and between the object and coupling medium. If these heterogeneities are not accounted for, they will cause distortions and artifacts in the reconstructed images. In this paper, we incorporated ultrasonic computed tomography (USCT), which measures the SOS distribution within the object, into our full-ring array PACT system. Without the need for ultrasonic transmitting electronics, USCT was performed using the same laser beam as for PACT measurement. By scanning the laser beam on the array surface, we can sequentially fire different elements. As a first demonstration of the system, we studied the effect of acoustic heterogeneities on photoacoustic vascular imaging. We verified that constant SOS is a reasonable approximation when the SOS variation is small. When the variation is large, distortion will be observed in the periphery of the object, especially in the tangential direction.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2036615DOIArticle
ORCID:
AuthorORCID
Anastasio, Mark A.0000-0002-3192-4172
Wang, Lihong V.0000-0001-9783-4383
Additional Information:© 2014 Society of Photo-Optical Instrumentation Engineers.
Subject Keywords:Ultrasound computed tomography, photoacoustic computed tomography, image reconstruction, speed of sound
Record Number:CaltechAUTHORS:20180912-103856411
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180912-103856411
Official Citation:Jun Xia, Jun Xia, Chao Huang, Chao Huang, Konstantin Maslov, Konstantin Maslov, Mark A. Anastasio, Mark A. Anastasio, Lihong V. Wang, Lihong V. Wang, } "Acoustic-speed correction of photoacoustic tomography by ultrasonic computed tomography based on optical excitation of elements of a full-ring transducer array", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89432G (3 March 2014); doi: 10.1117/12.2036615; https://doi.org/10.1117/12.2036615
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89569
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Sep 2018 18:42
Last Modified:12 Sep 2018 18:42

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