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Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Performing In Vivo and Ex Vivo Electrical Impedance Myography in Rodents
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Electrical tissue property imaging at low frequency using MREIT.

Jin Keun Seo, Eung Je Woo

    IEEE Transactions on Bio-Medical Engineering
    |April 25, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Magnetic Resonance Electrical Impedance Tomography (MREIT) advances MR imaging of tissue electrical properties. This technique uses MR signals to map conductivity and permittivity, overcoming limitations of other methods.

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    Area of Science:

    • Biophysics
    • Medical Imaging
    • Electrical Engineering

    Background:

    • Recent advancements in magnetic resonance (MR) imaging techniques have significantly improved the tomographic imaging of tissue's electrical properties, such as conductivity and permittivity.
    • Methods like MR electrical impedance tomography (MREIT) and electrical property tomography leverage the principle that changes in electrical properties perturb magnetic fields, detectable by MR signals.

    Purpose of the Study:

    • To review recent progress in MREIT.
    • To compare MREIT with other existing imaging methods for electrical properties.
    • To highlight the distinct features and potential improvements of MREIT.

    Main Methods:

    • Utilizing MR imaging scanners to control external electric fields and measure responses.
    • Formulating the imaging problem as a nonlinear inverse problem incorporating Maxwell's and Bloch equations.
    • Analyzing acquired MR signals to recover unknown tissue electrical properties (conductivity and permittivity).

    Main Results:

    • MREIT enables the tomographic imaging of tissue's electrical properties.
    • Local changes in electrical properties generate magnetic field perturbations detectable by MR signals.
    • The inverse problem formulation allows for the recovery of conductivity and permittivity distributions.

    Conclusions:

    • MREIT offers distinct advantages for imaging electrical properties compared to other methods.
    • Complementary imaging methods can enhance the visualization of tissue structures and states.
    • Further development in MREIT can improve the comprehensive understanding of biological tissues.