Characterization of flow emerging from a stenosis using MRI

H. Michael Gach, Irving J. Lowe

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

MRI ultra-fast imaging techniques are used to characterize flow emerging from streamlined and abrupt stenoses inside cylindrical channels. Reattachment lengths of the shear boundary to the channel wall are measured using rotating ultra-fast imaging sequence (RUFIS) in-flow imaging. Velocity profiles of flow are created using velocity (sine and cosine)encoded RUFIS sequences. The sine-encoded images permit one to identify reverse flow (i.e., eddies) that arise within the region of flow reattachment. The ratios of peak velocities (downstream/upstream of the stenosis) derived from the cosine- encoded images are used to identify the transition from the laminar to the turbulent regimen. Based on these experiments, the transition from the laminar to turbulent regimen occurs at a stenotic Reynolds Number of 350, whereas fully developed turbulence occurs at a stenotic Reynolds Number of 2600. These results are compared with the results from invasive studies.

Original languageEnglish
Pages (from-to)559-570
Number of pages12
JournalMagnetic resonance in medicine
Volume40
Issue number4
DOIs
StatePublished - Oct 1998

Keywords

  • Shear boundary reattachment, RUFIS
  • Stenotic flow
  • Ultra-fast imaging

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