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Motion-selective encoding for fast cine imaging.

G Z Yang1, J Keegan, D N Firmin

  • 1Visual Information Processing Group, Department of Computing, Imperial College of Science, Technology and Medicine, London, United Kingdom. gzy@doc.ic.ac.uk

Magnetic Resonance in Medicine
|September 1, 1999
PubMed
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This study introduces motion-selective encoding for faster magnetic resonance (MR) cine imaging. This technique reduces imaging time by 35% without compromising image quality for dynamic structures.

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Biomedical Engineering

Background:

  • Magnetic resonance (MR) cine imaging often dedicates significant field of view to static structures.
  • Dynamic features in MR cine imaging require precise delineation for diagnostic accuracy.

Purpose of the Study:

  • To develop and validate a motion-selective encoding method for accelerating MR cine imaging.
  • To assess the impact of reduced imaging time on image quality and diagnostic utility.

Main Methods:

  • Utilized a radiofrequency (RF) saturation pulse to partition the field of view into motion-affected and static regions.
  • Implemented fast ungated acquisition for static areas and reduced phase encoding for dynamic structures.
  • Addressed phase error correction and validated the algorithm in five healthy subjects.

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Main Results:

  • Achieved up to a 35% reduction in imaging time without visually discernible degradation in image quality.
  • Demonstrated that time savings are contingent upon the proportion of moving structures within the field of view.
  • The technique is most effective for cine images featuring substantial static surrounding structures.

Conclusions:

  • Motion-selective encoding offers a viable strategy for accelerating MR cine imaging acquisition.
  • The method provides significant time savings, particularly in applications with large static anatomical regions.
  • Further theoretical analysis quantifies maximum time-saving potential based on moving structure size.