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Related Experiment Video

Updated: Jan 19, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
11:21

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Published on: January 15, 2013

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Multi-wavelength spatial frequency domain diffuse optical tomography using single-pixel imaging based on lock-in

Tongxin Li, Zhuanping Qin, Xi Hou

    Optics Express
    |September 13, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new single-pixel imaging system for spatial frequency domain diffuse optical tomography. This system enables simultaneous multi-wavelength imaging of turbid media, offering a cost-effective and sensitive alternative to traditional methods.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Tomography

    Background:

    • Diffuse optical tomography (DOT) is crucial for non-invasive imaging of turbid media.
    • Conventional multi-wavelength DOT often relies on expensive cameras and sequential image acquisition.
    • There is a need for faster, more sensitive, and cost-effective DOT systems.

    Purpose of the Study:

    • To introduce a novel single-pixel spatial frequency domain (SFD) imaging system for simultaneous multi-wavelength tomographic imaging.
    • To demonstrate the system's capability for dynamic SFD imaging applications.
    • To validate the system's performance against conventional camera-based SFD imaging.

    Main Methods:

    • Utilized a single-pixel SFD imaging system with three low-power, frequency-encoded light sources.
    • Employed digital micromirror devices (DMDs) for generating illumination patterns and modulating reflected light.
    • Integrated a lock-in photon counting detector and the two-dimensional discrete cosine transform (DCT) into the single-pixel imaging (SPI) method.
    • Reconstructed multi-wavelength tomographic images using an inversion algorithm based on the diffusion equation.

    Main Results:

    • Achieved simultaneous acquisition of multi-wavelength spatially modulated reflectance images.
    • The DCT-SPI scheme enabled fast acquisition of SFD reflectance images.
    • Successfully extracted DC and AC amplitudes for tomographic image reconstruction.
    • Experimental results with tissue-simulating phantoms validated the system's performance.

    Conclusions:

    • The proposed DCT-SPI based SFD-DOT approach facilitates simultaneous reconstruction of multi-wavelength tomographic images.
    • This method offers a sensitive and potentially more affordable alternative for SFD imaging applications.
    • The system is well-suited for dynamic SFD imaging, opening avenues for further research and applications.