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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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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Related Experiment Video

Updated: Jun 8, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Radiofrequency-transparent local B0 shimming coils using float traps.

Changzhe Liu1,2, Hao Liang2,3, Ming Lu2,3

  • 1Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine
|November 5, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an innovative radiofrequency-transparent direct-current coil for magnetic resonance imaging (MRI) shimming. The new coil design minimizes interference, improving magnetic field homogeneity near implants without compromising image quality.

Keywords:
B0 shimmingRF transparencyimplantmulticoil shimmingsignal‐to‐noise ratio (SNR)transmit field

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Physics

Background:

  • Static magnetic field (B0) inhomogeneities are a significant challenge in high-field MRI.
  • Multicoil direct-current (DC) shimming is a flexible solution, but mutual coupling with radiofrequency (RF) coils can degrade performance.

Purpose of the Study:

  • To develop an innovative RF-transparent DC coil for B0 shimming.
  • To minimize the impact of DC shim coils on RF coil performance, including transmit field (B1+) and signal-to-noise ratio (SNR).

Main Methods:

  • Designed and fabricated square-shaped DC coils with float traps for 3T MRI.
  • Incorporated float traps to maintain high RF impedance and allow flexible coil placement.
  • Compared performance against conventional DC coils and conducted B0 shimming experiments near a metal hip implant.

Main Results:

  • The RF-transparent DC coil effectively minimized RF interference and preserved SNR and B1+.
  • Demonstrated significant improvement in B0 homogeneity around metal implants.
  • Substantially reduced MRI image distortion caused by B0 inhomogeneities.

Conclusions:

  • The RF-transparent DC coil provides a flexible and effective method for managing B0 inhomogeneities in MRI.
  • This technology facilitates the integration of multiturn DC shim coils into clinical MRI without major hardware changes.