Algorithms for extracting motion information from navigator echoes

Yi Wang, Roger C. Grimm, Joel P. Felmlee, Stephen J. Riederer, Richard L. Ehman

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Algorithms to reliably detect motion in navigator echoes are crucial to many MRI motion suppression techniques. The accuracy of these algorithms is affected by noise and deformation of navigator echo profile caused by physiologic motion. This study compared the performance of algorithms based on correlation and least squares for extracting displacement information from motion-monitoring navigator echoes, using computer simulation and in vivo imaging. The least squares algorithm was determined to be of higher accuracy than the correlation algorithm against errors caused by noise and pro file deformation.

Original languageEnglish (US)
Pages (from-to)117-123
Number of pages7
JournalMagnetic Resonance in Medicine
Volume36
Issue number1
DOIs
StatePublished - Jul 1 1996

Keywords

  • correlation
  • least squares
  • motion suppression
  • navigator echo

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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