Referenceless interleaved echo-planar imaging

Scott B. Reeder, Ergin Atalar, Anthony Z. Faranesh, Elliot R. McVeigh

Research output: Contribution to journalArticle

Abstract

Interleaved echo-planar imaging (EPI) is an ultrafast imaging technique important for applications that require high time resolution or short total acquisition times. Unfortunately, EPI is prone to significant ghosting artifacts, resulting primarily from system time delays that cause data matrix misregistration. In this work, it is shown mathematically and experimentally that system time delays are orientation dependent, resulting from anisotropic physical gradient delays. This analysis characterizes the behavior of time delays in oblique coordinates, and a new ghosting artifact caused by anisotropic delays is described. 'Compensation blips' are proposed for time delay correction. These blips are shown to remove the effects of anisotropic gradient delays, eliminating the need for repeated reference scans and postprocessing corrections. Examples of phantom and in vivo images are shown.

Original languageEnglish (US)
Pages (from-to)87-94
Number of pages8
JournalMagnetic Resonance in Medicine
Volume41
Issue number1
DOIs
StatePublished - 1999

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Keywords

  • Calibration
  • Compensation blips
  • EPI
  • MRI
  • Reconstruction
  • Reference scans

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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