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  • MRI Terms
  • Sample Reports - Radiology

• MRI Terms

- V -

• VECTOR

A quantity that has both magnitude and direction and that is commonly represented by an arrow. The length of the line segment represents the magnitude, and its orientation in space represents its direction. Vector quantities can be added to or subtracted from one another.



• VELOCITY

Speed in a particular direction.



• VELOCITY ENCODING (VENC)

A specialized technique used fro encoding flow velocities.



• VISCOSITY

A property of a fluid or semi-fluid that affects its mobility, and therefore its intensity in an image.



• VOLUMETRIC IMAGING

A specialized technique where all the MR signals are collected from the entire tissue sample and imaged as a whole entity. Compare with slice select.



• VORTEX FLOW

Area within a blood vessel where the blood is suddenly accelerated, then rapidly decelerated. This would be commonly seen in blood passing through a vascular stenosis (narrowing), and becomes a factor in MRA.



• VOXEL

Volume element; the element of the three-dimensional space corresponding to a pixel, for a given slice thickness.