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10 April 2023 Distributed aberration correction in handheld ultrasound based on tomographic estimates of the speed of sound
Rehman Ali, Trevor Mitcham, Melanie Singh, Richard Bouchard, Jeremy Dahl, Marvin Doyley, Nebojsa Duric
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Proceedings Volume 12470, Medical Imaging 2023: Ultrasonic Imaging and Tomography; 1247009 (2023) https://doi.org/10.1117/12.2653935
Event: SPIE Medical Imaging, 2023, San Diego, California, United States
Abstract
Phase aberration is one the key sources of image degradation in handheld B-mode ultrasound imaging. Sound speed heterogeneities create phase aberrations in the image by inducing additional tissue-dependent delays and diffractive effects that conventional beamforming does not incorporate. For this reason, the Fourier split-step angular spectrum method is used to simulate pressure fields in a heterogeneous sound speed medium and create B-mode images based on the cross-correlation of transmitted and received wavefields. Because the strongest aberrations are caused by a laterally varying sound speed profile, this work presents a new sound speed estimator that can be used to correct for aberrations in laterally varying media. Phantom experiments show a 58-76% improvement in point target resolution and a 2.5x improvement in contrast-to-noise ratio because of the proposed sound speed estimation and phase aberration correction scheme.
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Rehman Ali, Trevor Mitcham, Melanie Singh, Richard Bouchard, Jeremy Dahl, Marvin Doyley, and Nebojsa Duric "Distributed aberration correction in handheld ultrasound based on tomographic estimates of the speed of sound", Proc. SPIE 12470, Medical Imaging 2023: Ultrasonic Imaging and Tomography, 1247009 (10 April 2023); https://doi.org/10.1117/12.2653935
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KEYWORDS
Apodization
Aberration correction
Ultrasonography
Tomography
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