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Related Experiment Videos

Concomitant gradient field effects in spiral scans.

K F King1, A Ganin, X J Zhou

  • 1GE Medical Systems, Milwaukee, Wisconsin 53201, USA.

Magnetic Resonance in Medicine
|February 20, 1999
PubMed
Summary
This summary is machine-generated.

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Concomitant fields in MR imaging cause blurring artifacts that standard methods cannot detect. New reconstruction techniques can remove this blurring, improving image quality.

Area of Science:

  • Physics
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • Maxwell's equations predict concomitant fields accompanying imaging gradients in MR imaging.
  • These fields introduce artifacts, particularly spatially dependent blurring in spiral scans, due to unwanted phase accumulation.
  • Concomitant field errors are independent of echo time, evading detection by conventional Dixon-type field mapping.

Purpose of the Study:

  • To investigate the nature of concomitant fields and their impact on MR imaging artifacts.
  • To explore methods for mitigating concomitant field-induced blurring in spiral scans.
  • To address the limitations of existing deblurring techniques for these specific artifacts.

Main Methods:

  • Analysis of Maxwell's equations to understand concomitant field behavior.

Related Experiment Videos

  • Characterization of phase errors caused by time-varying concomitant fields during spiral readouts.
  • Evaluation of image reconstruction methods for correcting spatially dependent resonance offsets.

    • Main Results:

    • Concomitant fields, dependent on gradient amplitude and static field strength, cause phase errors and blurring.
    • Standard Dixon-type field mapping cannot correct for concomitant field phase errors.
    • Acquisition strategies to reduce concomitant field blurring can exacerbate off-resonant spin blurring.

    Conclusions:

    • Concomitant fields present a significant challenge for artifact reduction in MR imaging, especially with spiral trajectories.
    • Existing artifact correction methods are insufficient for concomitant field-induced blurring.
    • Advanced image reconstruction techniques offer a viable solution for removing concomitant field blurring and improving MR image fidelity.