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Diffuse optics using a dual window fast-gated counter.

Laura Di Sieno, Alberto Dalla Mora, Gianluca Boso

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    |November 18, 2014
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    Summary
    This summary is machine-generated.

    A new fast-gated counter offers a cost-effective solution for time-resolved diffuse optical spectroscopy, matching traditional methods in performance for applications like brain imaging.

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    Area of Science:

    • Biomedical Optics
    • Instrumentation
    • Spectroscopy

    Background:

    • Time-resolved diffuse optical spectroscopy (TR-DOS) is crucial for functional imaging.
    • Traditional setups using time-correlated single-photon counting (TCSPC) can be costly and complex.
    • High count-rate capabilities are essential for efficient data acquisition in TR-DOS.

    Purpose of the Study:

    • To demonstrate the advantages of a fast-gated counter in TR-DOS.
    • To evaluate its performance against traditional TCSPC methods.
    • To showcase its applicability in real-world biomedical measurements.

    Main Methods:

    • Development and implementation of a novel fast-gated counter.
    • Experimental comparison with a TCSPC setup for depth sensitivity and signal-to-noise ratio.
    • Testing for bilayer analysis and absorption coefficient estimation.
    • Proof-of-principle arterial occlusion measurement on a healthy volunteer.

    Main Results:

    • The fast-gated counter achieves high count-rate and reduces equipment costs.
    • Experimental results show equivalence to TCSPC in depth sensitivity and signal-to-noise ratio.
    • The device is suitable for bilayer analysis and absorption coefficient estimation.
    • Successful validation through an in-vivo arterial occlusion measurement.

    Conclusions:

    • Fast-gated counters provide a cost-effective and less complex alternative for TR-DOS.
    • This technology significantly enhances multichannel time-resolved systems.
    • It offers substantial advantages for functional brain and muscle imaging applications.