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Related Experiment Videos

Referenceless interleaved echo-planar imaging.

S B Reeder1, E Atalar, A Z Faranesh

  • 1Department of Biomedical Engineering, John Hopkins University School of Medicine, Baltimore, Maryland 21287-0845, USA.

Magnetic Resonance in Medicine
|February 20, 1999
PubMed
Summary
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Interleaved echo-planar imaging (EPI) suffers from ghosting artifacts due to system time delays. This study introduces "compensation blips" to correct these delays, improving image quality without extra scans.

Area of Science:

  • Magnetic Resonance Imaging
  • Image Processing
  • Medical Physics

Background:

  • Interleaved echo-planar imaging (EPI) is crucial for ultrafast imaging demanding high temporal resolution.
  • EPI is susceptible to ghosting artifacts caused by system time delays leading to data misregistration.

Purpose of the Study:

  • To mathematically and experimentally demonstrate the orientation dependence of system time delays in EPI.
  • To introduce and validate a novel method for correcting anisotropic gradient delays and associated ghosting artifacts.

Main Methods:

  • Analysis of system time delays in oblique coordinates to characterize anisotropic gradient delays.
  • Development and application of "compensation blips" for real-time correction of time delays.
  • Experimental validation using phantom and in vivo imaging.

Related Experiment Videos

Main Results:

  • System time delays in EPI are shown to be orientation-dependent due to anisotropic physical gradient delays.
  • A new ghosting artifact arising from anisotropic delays is identified and described.
  • Compensation blips effectively eliminate the effects of anisotropic gradient delays, removing ghosting artifacts.

Conclusions:

  • Compensation blips offer an efficient solution for correcting EPI ghosting artifacts caused by anisotropic gradient delays.
  • This method eliminates the need for repeated reference scans and postprocessing, simplifying EPI acquisition.
  • The proposed technique enhances the reliability and quality of ultrafast imaging in MRI applications.