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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
09:30

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Published on: December 18, 2016

Improved shimming for fMRI specifically optimizing the local BOLD sensitivity.

Evelyne Balteau1, Chloe Hutton, Nikolaus Weiskopf

  • 1Cyclotron Research Centre, Liège University, Liège, Belgium. e.balteau@ulg.ac.be

Neuroimage
|August 18, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new shimming method for functional MRI (fMRI) that optimizes Blood Oxygen Level Dependent (BOLD) sensitivity. This BS-based shimming improved activation detection in the medial orbitofrontal cortex compared to standard methods.

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Magnetic field inhomogeneities in fMRI can cause signal loss and distortions in echo-planar images.
  • Standard shimming aims for magnetic field homogeneity, which may not optimize the Blood Oxygen Level Dependent (BOLD) signal crucial for fMRI.
  • A recent analytical method allows for BOLD sensitivity (BS) estimation and mapping.

Purpose of the Study:

  • To develop and evaluate a novel shimming procedure that optimizes local BOLD sensitivity in a region of interest (ROI).
  • To compare the efficacy of BS-based shimming against standard global shimming in an in vivo setting.

Main Methods:

  • Development of a shimming procedure targeting local BOLD sensitivity optimization.
  • Application of the BS-based shimming method in vivo.
  • Comparison with standard global shimming procedures.
  • Validation using a breath-holding fMRI experiment.

Main Results:

  • The BS-based shimming procedure was successfully applied in vivo.
  • A breath-holding experiment showed significantly improved activation detection in the medial orbitofrontal cortex using BS-based shimming.
  • The novel method demonstrated superior performance over standard global shimming for the targeted ROI.

Conclusions:

  • Optimizing local BOLD sensitivity through targeted shimming is a viable strategy for enhancing fMRI activation detection.
  • The developed BS-based shimming method offers a significant improvement for fMRI studies, particularly in challenging regions like the medial orbitofrontal cortex.