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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Magn Reson Med. 2010 Mar;63(3):765–771. doi: 10.1002/mrm.22245

Fig. 2.

Fig. 2

Phase-contrast (PC) velocity MRI of Internal Carotid Arteries (ICA) and Vertebral Arteries (VA). (a) Location of the slice of PC velocity MRI on a mid-sagittal image. (b) Location of the PC velocity MRI on the angiogram. (c) Raw image of PC velocity MRI. (d) Magnitude image of PC velocity MRI. The insets show the left and right ICAs and VAs as well as the manually drawn ROIs. (e) Velocity map from the PC velocity MRI. Positive value indicates inflow blood, often corresponding to arteries, whereas negative value indicates outflow blood, typically from veins.