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Image reconstruction of sequentially sampled echo-planar data

F Hyder1, D L Rothman, A M Blamire

  • 1Department of Chemistry, Yale University, New Haven, CT 06510.

Magnetic Resonance Imaging
|January 1, 1995
PubMed
Summary
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Sequential sampling in echo-planar imaging (EPI) can cause aliasing artifacts. This study presents two methods to acquire artifact-free EPI images using sequential data sampling.

Area of Science:

  • Magnetic Resonance Imaging
  • Image Reconstruction

Background:

  • Echo-planar imaging (EPI) is a fast magnetic resonance imaging technique.
  • Aliasing artifacts can occur in EPI due to improper time-reversal of alternate echoes during sequential sampling.
  • These artifacts degrade image quality and complicate interpretation.

Purpose of the Study:

  • To investigate the cause of image artifacts in EPI acquired with sequential sampling.
  • To develop and demonstrate methods for obtaining artifact-free EPI images with sequential sampling.

Main Methods:

  • Analysis of image artifacts in EPI data acquired using sequential sampling.
  • Examination of the time-reversal process of alternate echoes before Fourier transformation.
  • Implementation and validation of two novel methods to correct for aliasing artifacts.

Related Experiment Videos

Main Results:

  • Identified sequential sampling and improper echo time-reversal as the source of EPI artifacts.
  • Demonstrated two distinct methods that successfully eliminate aliasing artifacts.
  • Achieved artifact-free EPI images with sequential data acquisition.

Conclusions:

  • Sequential sampling in EPI necessitates specific handling of alternate echoes to prevent aliasing.
  • The presented methods provide effective solutions for artifact-free EPI reconstruction.
  • These findings improve the reliability and diagnostic utility of EPI in MRI.