Rapid autocorrection using prescan navigator echoes

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Autocorrection is an adaptive motion correction algorithm that does not require an in vivo measurement of the motion record. A novel method for ensuring convergence of this algorithm when motion is severe is presented. A limited number of navigator echoes are acquired before the imaging sequence to obtain a 'snapshot' of the object. Phase differences between the navigator and image k-space data are used as an estimate of motion-induced phase shifts in the image, followed by autocorrection. In phantom data a six-fold reduction in computation time compared to autocorrection alone was realized. These results indicate that this navigator/autocorrection combination may be useful for reducing motion artifacts and computation time for MR exams when motion along the image phase encoding axis is severe. (C) 2000 Wiley-Liss, Inc.

Original languageEnglish (US)
Pages (from-to)583-588
Number of pages6
JournalMagnetic Resonance in Medicine
Volume43
Issue number4
DOIs
StatePublished - Apr 18 2000

Keywords

  • Autocorrection
  • Motion correction
  • Navigator echoes

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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