Encoding strategies for three‐direction phase‐contrast MR imaging of flow
- 1 July 1991
- journal article
- research article
- Published by Wiley in Journal of Magnetic Resonance Imaging
- Vol. 1 (4), 405-413
- https://doi.org/10.1002/jmri.1880010404
Abstract
Three encoding strategies for the measurement of flow velocities in arbitrary directions with phase-contrast magnetic resonance imaging are presented; their noise and dynamic range performance are compared by means of theoretical analysis and computer simulation. A six-point measurement strategy is shown to be quite inefficient in terms of velocity variance per unit time. A simple four-point method exhibits equal dynamic range; its noise depends on flow direction but on average is equal to that of the six-point method. An alternate, balanced four-point method has noise that is direction independent and has, depending on implementation, possibly lower noise levels. Either four-point method is more efficient and is preferred over the six-point approach.Keywords
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