Premium
Effects of acceleration on the accuracy of MR phase velocity measurements
Author(s) -
Oshinski John N.,
Ku David N.,
Bohning Daryl E.,
Pettigrew Roderic I.
Publication year - 1992
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880020610
Subject(s) - acceleration , laminar flow , mechanics , reynolds number , physics , flow (mathematics) , flow velocity , convection , phase (matter) , classical mechanics , turbulence , quantum mechanics
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.