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Updated: Feb 12, 2026

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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A Dynamic Shim Approach for Correcting Eddy Current Effects in Diffusion-Prepared MRI Acquisition Using a Multi-Coil

Congyu Liao1,2, Jason P Stockmann3, Zhitao Li2

  • 1Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA.

Magnetic Resonance in Medicine
|February 11, 2026
PubMed
Summary
This summary is machine-generated.

A novel dynamic B0 shimming method using an AC/DC shim array corrects eddy current phase errors in diffusion-prepared MRI. This enables high b-value imaging without signal-to-noise ratio loss from magnitude stabilizers.

Keywords:
B0 shim array coilconcomitant fieldsdiffusion MRIeddy currents correctionlocal field control

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics

Background:

  • Diffusion-prepared MRI is crucial for neuroimaging.
  • Eddy currents from diffusion gradients cause phase errors, degrading image quality.
  • Magnitude stabilizers are often used but reduce signal-to-noise ratio (SNR).

Purpose of the Study:

  • To develop a dynamic B0 shimming approach for correcting eddy current-induced phase errors in diffusion-prepared MRI.
  • To enable high b-value imaging without SNR loss.
  • To eliminate the need for magnitude stabilizers.

Main Methods:

  • A 46-channel AC/DC shim array and amplifier system were constructed.
  • Spin echo prescans measured eddy current-induced phase differences.
  • An optimization framework computed compensatory shim currents for multi-shot 3D diffusion-prepared acquisitions.

Main Results:

  • The AC/DC shim array effectively corrected undesirable eddy current effects.
  • Whole-brain, cardiac-gated, multi-shot 3D diffusion-prepared imaging was achieved without magnitude stabilizers.
  • Full SNR was preserved, enabling reliable diffusion encoding at b values up to 2000 s/mm².

Conclusions:

  • A new strategy using an AC/DC shim array compensates for eddy current-induced phase errors in diffusion-prepared MRI.
  • This approach eliminates the need for magnitude stabilizers.
  • Efficient, high-quality diffusion imaging with retained signal sensitivity is now possible.