Ultrasound imaging of the brain using full-waveform inversion

Conference paper (2020)

Authors

U. Taskin ImPhys/Medical Imaging - AS
Kjersti Solberg Eikrem NORCE Norwegian Research Centre AS
Geir Naevdal NORCE Norwegian Research Centre AS
Morten Jakobsen University of Bergen and Bjerknes Centre for Climate Research
D.J. Verschuur ImPhys/Computational Imaging - AS
K.W.A. van Dongen ImPhys/Medical Imaging - AS
Research Group
ImPhys/Computational Imaging (AS) (TU Delft)
Copyright: © 2020 U. Taskin, Kjersti Solberg Eikrem, Geir Naevdal, Morten Jakobsen, D.J. Verschuur, K.W.A. van Dongen
DOI
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https://doi.org/10.1109/IUS46767.2020.9251665
Brain Quantitative imaging Full-waveform inversion Speed-of-sound profile Transcranial ultrasound
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Computational Imaging

Abstract

Transcranial ultrasound has been used to image the brain since 1942. Currently, it is regaining interest and full-waveform inversion (FWI) methods are now employed to reconstruct speed-of-sound profiles of the brain. Many of these methods require a good starting model. Here, we test the applicability of contrast source inversion (CSI) as a FWI method to reconstruct two-dimensional speed-of-sound profiles of the soft brain tissue enclosed by the skull. The advantage of CSI is that it can handle large acoustic contrasts without the need for a good starting model. To test the performance of CSI, we first compute synthetic data. The resulting pressure field clearly shows a significant amount of multiple scattering caused by the skull that acts as a hard acoustic contrast. Next we invert the resulting synthetic data within the Born approximation as well as by applying CSI as a FWI method. The results clearly show that Born inversion can only image the soft brain tissue in the absence of the skull whereas it generates erroneous results when the skull is present. On the other hand, with CSI it is feasible to reconstruct both the skull and the soft brain tissue accurately. Importantly, as compared to other methods CSI does not require any a priori information about the contrast, a mask or a heterogeneous starting model to reconstruct the soft tissue enclosed by the skull.