Determination of wall shear stress in the aorta with the use of MR phase velocity mapping

John N. Osinnski, David N. Ku, Srinivasan Mukundan, Francis Loth, Roderic I. Pettigrew

Research output: Contribution to journalArticle

132 Scopus citations

Abstract

MR phase velocity mapping was used to calculate wall shear stress (WSS) in the suprarenal and infrarenal abdominal aorta, two sites with very different proclivities for development of atherosclerosis. For the eight subjects studied, the average value of the mean (tune averaged over the cardiac cycle) WSS in the suprarenal aorta was 10.4 dynes/cm2 at the posterior wall and 8.6 at the anterior wall. In the infrarenal aorta, WSS values were 4.7 at the posterior wall and 6.1 at the anterior wall. Peak WSS over the cardiac cycle was 48 and 54 at the anterior and posterior walls of the suprarenal aorta, respectively, and 33 and 30 at the anterior and posterior walls of the infrarenal aorta, respectively. Wide variation was found in both mean and peak WSS values among subjects. However, for 28 of 32 locations examined, mean and peak WSS were ingher in the suprarenal aorta than in the infrarenal aorta. Because atherosclerosis is more likely to form in the infrarenal aorta than in the suprarenal aorta, tins study supports the hypothesis that low WSS is a localizing factor for atherosclerosis, and ingh WSS may act as a deterrent against formation of atherosclerosis.

Original languageEnglish (US)
Pages (from-to)640-647
Number of pages8
JournalJournal of Magnetic Resonance Imaging
Volume5
Issue number6
DOIs
StatePublished - 1995

Keywords

  • Atherosclerosis
  • Flow
  • MR Imaging
  • Velocity
  • Wall shear stress

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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