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 journalArticlepeer-review

70 Scopus citations


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
Issue number1
StatePublished - Jul 1996


  • correlation
  • least squares
  • motion suppression
  • navigator echo

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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