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
Summary
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.
