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Two-step navigatorless correction algorithm for radial k-space MRI acquisitions.

A Shankaranarayanan1, M Wendt, J S Lewin

  • 1Department of Radiology, Case Western Reserve University and University Hospitals of Cleveland, 1100 Euclid Avenue, Cleveland, OH 44106, USA.

Magnetic Resonance in Medicine
|February 17, 2001
PubMed
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This study introduces a novel method to reduce artifacts in radial MRI scans. It improves image quality by correcting phase variations without increasing scan time or requiring new hardware.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Processing

Background:

  • Radial k-space acquisitions are susceptible to artifacts from view-dependent phase variations and object motion.
  • Existing correction methods, like navigator echoes, can increase scan time or require complex hardware modifications.

Purpose of the Study:

  • To develop and validate a new method for correcting artifacts in radial MRI.
  • To improve the quality of magnetic resonance images acquired using radial trajectories.

Main Methods:

  • The method exploits inherent properties of radial k-space acquisition trajectories.
  • It utilizes phase information from all acquired k-space data points for correction.
  • Feasibility was demonstrated through simulations, phantom studies, and in vivo experiments.

Related Experiment Videos

Main Results:

  • The novel method effectively corrects view-dependent phase variations and rigid body motion artifacts.
  • It achieves artifact correction without additional gradient structures or extended scan times.
  • Improved image quality in radial MRI acquisitions was observed.

Conclusions:

  • This technique offers an efficient and hardware-independent approach to enhance radial MRI image quality.
  • It provides a valuable tool for reducing common artifacts in radial imaging sequences.
  • The method is broadly applicable to various radial MRI applications.