Effects of acceleration on the accuracy of MR phase velocity measurements

John N. Oshinski, David N. Ku, Daryl E. Bohning, Roderic I. Pettigrew

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Acceleration in blood flow can affect the accuracy of phase velocity measurements. Convective acceleration is due to changes in flow geometry and is independent of the time‐varying acceleration caused by flow pulsatility. To analyze the effects of convective acceleration on flow velocity measurements, phase velocity measurements were obtained in steady laminar flow in the convergent segment of a 90%, hourglass‐shaped stenosis phantom at a Reynolds number of 1,500. Measurements at the stenosis indicated that convective acceleration caused the measured values of average cross‐sectional velocity to deviate as much as 37% from the theoretical values. The magnitude of the error could be accounted for by including the convective acceleration term in the phase shift equation. Convective acceleration effects should not be ignored in flow velocity measurements through stenoses, even when time‐dependent acceleration due to flow pulsatility can be neglected.

Original languageEnglish (US)
Pages (from-to)665-670
Number of pages6
JournalJournal of Magnetic Resonance Imaging
Volume2
Issue number6
DOIs
StatePublished - 1992

Keywords

  • Blood vessels, stenosis or obstruction, 9*.721
  • Blood, flow dynamics
  • Gradient waveforms
  • Phantoms
  • Vascular studies

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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