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Off-resonance artifact correction for MRI: A review

Melissa W Haskell1,2, Jon-Fredrik Nielsen3, Douglas C Noll3

  • 1Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA.

NMR in Biomedicine
|November 3, 2022
PubMed

Insights

Magnetic resonance imaging (MRI) off-resonance causes artifacts like signal loss and distortion. This review covers off-resonance sources, effects, and solutions, especially for low-field MRI systems.

Area of Science:

  • Medical Imaging
  • Physics

Background:

  • Magnetic resonance imaging (MRI) relies on a uniform main magnetic field for image quality.
  • Inhomogeneity in this field, known as off-resonance, introduces artifacts that degrade MR images.

Purpose of the Study:

  • To review the origins and impacts of off-resonance in MRI.
  • To discuss methods for preventing and correcting off-resonance artifacts.
  • To examine off-resonance challenges and benefits in low-field and portable MRI.

Main Methods:

  • Literature review of off-resonance phenomena in magnetic resonance imaging.
  • Analysis of artifact types including signal loss, geometric distortion, and blurring.
  • Discussion of mitigation strategies and considerations for low-field systems.

Main Results:

  • Off-resonance arises from various sources and significantly impacts image fidelity.
  • Effective strategies exist for preventing and correcting off-resonance artifacts.
  • Low-field MRI presents unique advantages and challenges regarding off-resonance.

Conclusions:

  • Understanding and managing off-resonance is crucial for reliable MRI applications.
  • Correction techniques enhance the diagnostic and research value of MR images.
  • Further research is needed to optimize low-field MRI performance by addressing off-resonance.

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