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Fast iterative pre-emphasis calibration method enabling third-order dynamic shim updated fMRI.

Ariane Fillmer1, Signe Johanna Vannesjo1, Matteo Pavan1

  • 1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland.

Magnetic Resonance in Medicine
|May 8, 2015
PubMed
Summary
This summary is machine-generated.

This study calibrates pre-emphasis to manage eddy currents in functional MRI (fMRI), enabling dynamic shim updating without increasing scan times or causing artifacts.

Keywords:
B0 shimmingdynamic shim updatingeddy current compensationpre-emphasis calibrationresting-state fMRIspatio-temporal field monitoring

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging

Background:

  • Eddy currents in MRI can distort image quality.
  • Dynamic shim updating aims to correct magnetic field fluctuations.
  • Scan time extensions are a limitation for dynamic shim updating in fMRI.

Purpose of the Study:

  • To calibrate pre-emphasis for eddy current compensation in fMRI.
  • To enable dynamic shim updating without extending scan times.

Main Methods:

  • Characterized eddy current effects using a third-order field camera.
  • Derived and refined pre-emphasis settings.
  • Applied calibrated pre-emphasis with dynamic excitation frequency (F0) and B0 optimization for echo planar imaging (EPI) and resting-state fMRI.

Main Results:

  • Achieved settling times below 2 ms for eddy current effects.
  • Enabled dynamic shim updating in fMRI without scan time extension or artifacts.
  • Dynamic F0 determination prevented image shifts; hardware limitations affected shim performance.

Conclusions:

  • The proposed method allows for accurate pre-emphasis calibration.
  • Enables the application of dynamic shim updating to fMRI.