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Related Concept Videos

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...

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Updated: Jun 6, 2026

Diffusion Imaging in the Rat Cervical Spinal Cord
10:46

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Published on: April 7, 2015

Optical diffusion imaging: a comparative numerical and experimental study.

J S Reynolds, A Przadka, S P Yeung

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We developed an affordable device for broadband frequency domain photon migration measurements. This system

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    Last Updated: Jun 6, 2026

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    Published on: April 7, 2015

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    Published on: November 19, 2020

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    Area of Science:

    • Biomedical Optics
    • Photon Migration Imaging
    • Optical Physics

    Background:

    • Photon migration measurements are crucial for non-invasive tissue imaging.
    • Existing methods can be costly and complex.
    • Developing accessible instrumentation is essential for broader research applications.

    Purpose of the Study:

    • To introduce a low-cost apparatus for broadband frequency domain photon migration measurements.
    • To validate the apparatus by comparing experimental data with theoretical models.
    • To investigate the impact of simulation parameters on measurement accuracy.

    Main Methods:

    • Designed and constructed a photodiode-LED based instrument.
    • Acquired broadband frequency domain photon migration data.
    • Utilized finite-difference frequency domain solutions of the diffusion approximation.
    • Analyzed the influence of boundary conditions and finite source size on simulations.

    Main Results:

    • The developed apparatus provides reliable broadband frequency domain photon migration data.
    • Simulations incorporating specific boundary conditions accurately reflect experimental measurements.
    • Finite source size significantly affects the resolution of photon migration measurements.

    Conclusions:

    • The low-cost apparatus is suitable for frequency domain photon migration studies.
    • Accurate modeling requires careful consideration of boundary conditions and source characteristics.
    • This work facilitates more accessible research in diffuse optical imaging.