Continuous inversion angiography.
A subtractive time-of-flight technique for magnetic resonance angiography is described. In this approach, the arterial supply to an organ is inverted in a steady-state fashion by applying off-resonance irradiation in the presence of a linear magnetic field gradient. An angiogram is formed by subtracting an image acquired with arterial inversion from a control image acquired with no arterial inversion. A single coil is used to apply both the inversion and observation pulses. Intracranial angiograms obtained from normal volunteers using a two-dimensional projective implementation of this technique at 1.5 T illustrate excellent small vessel detail and background suppression.
Roberts
D A
DA
Department of Radiology, University of Pennsylvania, Philadelphia.
Bolinger
L
L
Detre
J A
JA
Insko
E K
EK
Bergey
P
P
Leigh
J S
JS
D000465:Algorithms; D000792:Angiography / Q000379:methods*; D002533:Cerebral Angiography / Q000379:methods; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008962:Models, Theoretical