Velocity quantification in magnetic resonance imaging.
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A variety of methods has been developed for quantitating flow in vivo. These are usually based on the principles of velocity-phase or TOF information. The former allows a point-by-point 2D image of velocity, but also has other manifestations involving real-time 1D projections or 1D projections with 1D velocity information (flow zeugmatography). The TOF methods use the in-flow of unsaturated spins into a saturated region (for example) to estimate flow. The concepts, features, and clinical applications of these and other techniques are reviewed in this article.
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