SVD beamforming for ultrafast aberration correction and real-time speed-of-sound quantification
| Autor: | Mickael Tanter, Thomas Deffieux, Hanna Bendjador |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Beamforming business.industry Phase (waves) Frame rate 01 natural sciences 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics Transmission (telecommunications) Speed of sound 0103 physical sciences Singular value decomposition Coherence (signal processing) business 010301 acoustics Adaptive beamformer |
| Zdroj: | 2020 IEEE International Ultrasonics Symposium (IUS). |
| Popis: | The rise of plane or diverging ultrasound waves allowed to perform high quality imaging at much faster frame rates. Though, propagation through complex layers induces phase and amplitude aberrations that remain partially unresolved. In ultrafast ultrasound imaging, the backscattered signals contain information on the whole medium, for each transmission. We proposed an approach to take benefit of this and provide a fast aberration correction. Based on the Singular Value Decomposition of an appropriate matrix (the ultrafast compound matrix), this technique separates the spatial and angular variation. We demonstrate that the first eigen vector optimizes the angular coherence of backscattered signals. Thus, it provides the knowledge of the amplitude and phase of the aberration on one side, and the corrected image on the other side. Experimental in vivo results prove the efficiency of the image correction, even in the case of spatially extended aberrations. Thanks to the knowledge of the aberration phase, we proposed a real-time estimation of the speed of sound within the region of interest. We implemented this further to build local in vitro sound speed maps. The speed and simplicity of this novel approach paves the way to unprecedented quantitative and adaptive ultrafast ultrasound applications. |
| Databáze: | OpenAIRE |
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