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When a wave field is measured within a propagative medium, it is widely accepted that the resulting image resolution depends on the measuring point density, and no longer on the wavelength. Indeed, in-situ measurements allow the near-field details needed for super-resolution to be retrieved. Rarely studied in elastography, this is supported here by experiments in ultrasounds and optics. A passive elastography imaging of two inclusions in a tissue mimicking phantom is shown with a resolution down to 1/45th of a shear wavelength.
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Stefan Catheline, Gabrielle Laloy-Borgna, Chadi Zemzemi, Ali Zorgani, "What resolution to expect from shear wave elastography?," Proc. SPIE 11645, Optical Elastography and Tissue Biomechanics VIII, 1164512 (5 March 2021); https://doi.org/10.1117/12.2579326