Evaluation of subclavian steal with two-dimensional phase-contrast and two-dimensional time-of-flight MR angiography.
We describe two MR angiographic methods of diagnosing subclavian steal in each of three patients. By using phase-directional information from a single two-dimensional phase-contrast sequence, we were able to show that the direction of flow in the affected vertebral artery was reversed. The same vertebral artery showed no signal on a 2-D time-of-flight sequence with a concatenated presaturation pulse applied above each section.
Department of Radiology, University of Utah Medical Center, Salt Lake City.
J
J
Drutman
A
A
Gyorke
W L
WL
Davis
P A
PA
Turski
D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D016893:Carotid Stenosis / Q000175:diagnosis / Q000503:physiopathology; D002533:Cerebral Angiography; D006801:Humans; D007091:Image Processing, Computer-Assisted; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D013349:Subclavian Steal Syndrome / Q000175:diagnosis* / Q000503:physiopathology; D014711:Vertebral Artery / Q000503:physiopathology; D014715:Vertebrobasilar Insufficiency / Q000175:diagnosis / Q000503:physiopathology