Abstract
Photon scattering imposes a fundamental restriction on optical imaging in turbid media. In this work, we propose a compressive-sensing-based photoacoustic imaging modality that allows single-shot tomography with a single detector in a scattering medium. The nonuniform optical speckle grains created in the diffusive regime, which act as a conventional drawback of optical modality, are used to generate ultrasound locally. The photoacoustic signals from spatial positions can be well extracted from a superimposed signal via introduction of locally modulated time delays. Taking advantage of the compressed measurement assisted by the acoustic mask, we demonstrate a theoretical compressed framework of three-dimensional photoacoustic surface tomography with a broad field of view after one-time optical illumination. This approach can increase the photoacoustic imaging efficiency greatly and reveals the potential for dynamic imaging in optically diffusive media.
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