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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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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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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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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Low-Field Magnetic Resonance Imaging.

Hans-Martin Klein1

  • 1MRI, Medical Center Siegerland Airport, Burbach, Germany.

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|May 13, 2020
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Summary
This summary is machine-generated.

Low-field Magnetic Resonance Imaging (MRI) systems offer significant medical, economic, and ecological benefits despite lower signal-noise ratio. Re-evaluating field strength is crucial for advancing MRI technology and patient care.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging Technology
  • Diagnostic Imaging

Background:

  • High-field MRI (1.5T and above) has dominated technological advancements for over 20 years.
  • Low- and mid-field MRI systems, offering unique advantages, are becoming less common.
  • This review prompts a re-evaluation of magnetic field strength's role in MRI.

Purpose of the Study:

  • To re-evaluate the significance of magnetic field strength in MRI.
  • To highlight the underappreciated advantages of low-field MRI systems.
  • To advocate for the continued development and clinical use of low-field MRI.

Main Methods:

  • Comprehensive literature review using MEDLINE (PubMed) from 1980-2019.
  • Inclusion of articles based on relevance and evidence.
  • Analysis focused on the impact of field strength on MRI performance and benefits.

Main Results:

  • Low-field MRI systems exhibit reduced signal-noise ratio (SNR) and spectral differentiation.
  • However, they offer advantages like shorter T1 relaxation, better T1 contrast, and fewer artifacts (metal, susceptibility, chemical shift, dielectric).
  • Benefits extend to better tissue penetration, lower RF power deposition, reduced 'missile effects', and less impact on implants, with lower energy and helium consumption.

Conclusions:

  • Despite lower SNR, low-field MRI systems provide crucial advantages for patients.
  • Modern technology can mitigate SNR limitations, enabling diagnostic quality.
  • Developing high-quality low-field MRI is both feasible and necessary for broader medical, economic, and ecological benefits.