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Photoacoustic imaging beyond the acoustic diffraction limit

Abstract : Wave imaging remained diffraction-limited for centuries, until methods, such as PALM, STORM and STED were proposed in optics. Thanks to such methods, imaging with a precision much better than the wavelength became possible.Inspired by these super-resolution methods, the present PhD study is focused on pushing the diffraction limit in acoustic-resolution photoacoustics. In the frames of this study, super-resolution is demonstrated experimentally in vitro with such techniques as super-localisation, fluctuation-based analysis and model-based reconstruction. For each method, the resolution limit is identified, strong and weak points are analysed, prospects are discussed. In addition, super-resolution by sparsity-based reconstruction is demonstrated in relation to sparse-array imaging. At the end, all studied super-resolution methods are compared. An extra chapter is devoted to overcoming visibility problems in photoacoustic imaging by means of fluctuation analysis.
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  • HAL Id : tel-02501188, version 1

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Sergey Vilov. Photoacoustic imaging beyond the acoustic diffraction limit. Instrumentation and Detectors [physics.ins-det]. Université Grenoble Alpes, 2019. English. ⟨NNT : 2019GREAY035⟩. ⟨tel-02501188⟩

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