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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Nuclear Magnetic Resonance (NMR): Overview01:07

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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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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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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Nuclear Fusion02:45

Nuclear Fusion

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Nuclear magnetic resonance imaging.

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    Nuclear magnetic resonance imaging (MRI) is becoming essential in clinical practice, especially for central nervous system disorders. Future applications of this powerful imaging technique are vast and continually expanding.

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    Area of Science:

    • Medical Imaging
    • Radiology
    • Neuroimaging

    Background:

    • Nuclear magnetic resonance imaging (MRI) is a rapidly advancing medical imaging modality.
    • Its clinical utility is increasingly recognized, particularly in neurological applications.
    • The technology is still evolving, with significant future potential.

    Purpose of the Study:

    • To review the fundamental physical principles of MRI.
    • To outline current applications of MRI in central nervous system (CNS) disorders.
    • To discuss the future potential of MRI in neuroimaging and compare it with other modalities.

    Main Methods:

    • Review of the basic physics underlying nuclear magnetic resonance imaging.
    • Analysis of current clinical applications in CNS disorders.
    • Comparative assessment with computed tomography (CT) and positron emission tomography (PET).

    Main Results:

    • Nuclear magnetic resonance imaging is poised to play a significant role in clinical practice.
    • Current uses are primarily focused on central nervous system disorders.
    • The technique shows great promise for future applications in neuroimaging.

    Conclusions:

    • Nuclear magnetic resonance imaging is a valuable diagnostic tool with a growing role in clinical practice.
    • Its full potential, especially in neuroimaging, is still being realized.
    • Continuous evolution and expansion of MRI applications are expected in the coming years.