From Time-Reversal Mirrors to Matrix Imaging
Mathias Fink, Ph.D.Professor, ESPCI Paris
Simons Foundation Presidential Lectures are free public colloquia centered on four main themes: Biology, Physics, Mathematics and Computer Science, and Neuroscience and Autism Science. These curated, high-level scientific talks feature leading scientists and mathematicians and are intended to foster discourse and drive discovery among the broader NYC-area research community. We invite those interested in the topic to join us for this weekly lecture series.
Can we make a wave revive its past life? The development of ‘time-reversal mirrors’ for different types of waves — ultrasound, microwave and visible light — has made it possible to exploit time reversibility. Such devices bounce waves back and forth with a target like a game of tennis, with the waves becoming more focused over time. These instruments offer original solutions for imaging complex disordered environments.
In this lecture, Mathias Fink will show how medical imaging of complex tissues with light or ultrasound in reflection mode can be revisited based on the concept of time-reversal processors. He will show that, with a multi-illumination strategy, recording a reflection matrix from this media provides enough information to compensate for any distortion effects in the tissues. This is the domain of ‘matrix imaging’ developed for ultrasound imaging and deep optical coherent tomography (OCT).
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