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9 March 2023 Fourier-transform acousto-optic imaging
Maïmouna Bocoum
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Proceedings Volume PC12379, Photons Plus Ultrasound: Imaging and Sensing 2023; PC1237915 (2023) https://doi.org/10.1117/12.2648033
Event: SPIE BiOS, 2023, San Francisco, California, United States
Abstract
Acousto-Optics (AO) imaging is a bimodal imaging technique which couples ultrasounds (US) to Infrared (IR) light inside a scattering medium. The photons which paths cross with a controlled MHz-ultrasound pulse undergo the acousto-optic effect, resulting in the frequency shift that can be selectively detected using holography-based detection methods. The spatio-temporal profile of US is crucial in the imaging step, and various approaches from direct imaging using focused US to indirect imaging using plane waves have been described in the literature. Here, we present an indirect imaging approach designated as Fourier-Transform Acousto-Optic (FTAO). The technique is based on digital holography for the detection of tagged photons. In FTAO, long-lasting US pulses are spatio-temporally structured in order to fetch the Fourier components of the AO image. We present an integrated setup where images at acquired at video rate and fully compabtible with the constraints of in-vivo imaging.
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Maïmouna Bocoum "Fourier-transform acousto-optic imaging", Proc. SPIE PC12379, Photons Plus Ultrasound: Imaging and Sensing 2023, PC1237915 (9 March 2023); https://doi.org/10.1117/12.2648033
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KEYWORDS
Acousto-optics
Photons
In vivo imaging
Light scattering
Modulation
Tissue optics
Tissues
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