Distributed Aberration Correction in Handheld Ultrasound Based on Tomographic Estimates of the Speed of Sound
MEDICAL IMAGING 2023(2023)
摘要
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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关键词
Nonlinear inverse problems, pulse-echo ultrasound, reflection tomography, aberration correction, speed-of-sound imaging, Fourier split-step migration, time-shift gathers, lag-one coherence
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