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Super-resolution photoacoustic and ultrasound imaging with sparse arrays

Abstract : It has previously been demonstrated that model-based reconstruction methods relying on a priori knowledge of the imaging point spread function (PSF) coupled to sparsity priors on the object to image can provide super-resolution in photoacoustic (PA) or in ultrasound (US) imaging. Here, we experimentally show that such reconstruction also leads to super-resolution in both PA and US imaging with arrays having much less elements than used conventionally (sparse arrays). As a proof of concept, we obtained super-resolution PA and US cross-sectional images of microfluidic channels with only 8 elements of a 128-elements linear array using a reconstruction approach based on a linear propagation forward model and assuming sparsity of the imaged structure. Although the microchannels appear indistinguishable in the conventional delay-and-sum images obtained with all the 128 transducer elements, the applied sparsity-constrained model-based reconstruction provides super-resolution with down to only 8 elements. We also report simulation results showing that the minimal number of transducer elements required to obtain a correct reconstruction is fundamentally limited by the signal-to-noise ratio. The proposed method can be straigthforwardly applied to any transducer geometry, including 2D sparse arrays for 3D super-resolution PA and US imaging.
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https://hal.archives-ouvertes.fr/hal-02569202
Contributor : Bastien Arnal <>
Submitted on : Wednesday, November 25, 2020 - 12:00:23 PM
Last modification on : Tuesday, December 8, 2020 - 3:37:45 AM

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Sergey Vilov, Bastien Arnal, Eliel Hojman, Yonina Eldar, Ori Katz, et al.. Super-resolution photoacoustic and ultrasound imaging with sparse arrays. Scientific Reports, Nature Publishing Group, 2020, 10 (1), ⟨10.1038/s41598-020-61083-2⟩. ⟨hal-02569202⟩

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