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Correction for gradient nonlinearity in continuously moving table MR imaging.

Jason A Polzin1, David G Kruger, David H Gurr

  • 1General Electric Medical System, Milwaukee, Wisconsin 53201-0414, USA. jason.polzin@med.ge.com

Magnetic Resonance in Medicine
|July 6, 2004
PubMed
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Continuous table motion in MRI introduces gradient nonlinearities causing image blurring and distortion. This study demonstrates a correction method that effectively reduces these artifacts in both phantom and in vivo imaging.

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)

Background:

  • Large field of view MRI methods using continuous table motion are emerging.
  • Conventional MRI relies on magnetic field gradients for spatial encoding.

Purpose of the Study:

  • To investigate the impact of gradient nonlinearities in continuous table motion MRI.
  • To develop and validate a correction method for artifacts introduced by gradient nonlinearities.

Main Methods:

  • Spatial encoding performed using magnetic field gradients during continuous table motion.
  • Analysis of gradient nonlinearities causing spatially dependent blurring and distortion.
  • Development of a correction technique applied to phase-encoding steps.

Main Results:

Related Experiment Videos

  • Gradient nonlinearities manifest as blurring and spatial distortion due to object displacement.
  • The observed blurring is dependent on spatial location within the image.
  • Correction of phase-encoding steps significantly reduced blurring and distortion artifacts.

Conclusions:

  • Continuous table motion in MRI is susceptible to gradient nonlinearity artifacts.
  • A phase-encoding correction method effectively mitigates these artifacts.
  • The validated correction method improves image quality in large field of view MRI.