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Related Experiment Videos

Parallel magnetic resonance imaging using coils with localized sensitivities.

James W Goldfarb1, Agnes E Holland

  • 1Department of Research and Education, St. Francis Hospital, Roslyn, NY, USA. james.goldfarb@chsli.org

Magnetic Resonance Imaging
|August 4, 2004
PubMed
Summary

A new local reconstruction method effectively removes fold-over artifacts in MRI scans, improving the field-of-view. This technique offers a better alternative to conventional sum-of-squares reconstruction for phased array coils.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology

Background:

  • Conventional MRI reconstruction using phased array coils can produce artifacts.
  • Localized sensitivities in phased array coils may lead to image reconstruction inefficiencies.

Purpose of the Study:

  • To present clinical examples of MRI reconstruction inefficiencies.
  • To illustrate the benefits of a local reconstruction method over conventional techniques.

Main Methods:

  • Five patients underwent cardiac-synchronized, gadolinium-enhanced MRI at 1.5 T.
  • Four image reconstruction methods were applied: sum-of-squares, localized sum-of-squares (anterior/posterior), and local reconstruction.
  • Images were analyzed for artifacts and usable field-of-view.

Main Results:

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  • Conventional reconstruction resulted in fold-over artifacts in all cases (mean 90 mm).
  • Local reconstruction successfully removed fold-over artifacts.
  • Local reconstruction increased the effective field-of-view by a mean of 50%.

Conclusions:

  • Phased array coils may lack overlapping sensitivities, necessitating alternative reconstruction methods.
  • Local reconstruction is an effective method for removing fold-over artifacts and increasing field-of-view.
  • Parallel imaging gains should be evaluated against localized method acquisition times, not conventional sum-of-squares.