Angiographic imaging with 2D RF pulses.
Magnetic resonance angiography (MRA) was performed by using RF pulses designed to excite a limited spatial extent in two orthogonal directions. The restriction in the second spatial dimension can be used to increase inflow enhancement and to improve small field-of-view imaging. A rectangular excitation was produced with an "echo-planar" k-space trajectory and a sinc-modulated RF waveform. In vivo images have demonstrated that vessels are more clearly delineated with the two-dimensional excitation. Aliasing artifacts in small field-of-view imaging are significantly reduced, although in some cases complete elimination is not possible due to the nature of the gradient trajectory.
Alley
M T
MT
Department of Radiology, Stanford University, California 94305-5488, USA.
Pauly
J M
JM
Sommer
F G
FG
Pelc
N J
NJ
D000005:Abdomen / Q000098:blood supply; D000465:Algorithms; D001012:Aorta, Abdominal / Q000033:anatomy & histology; D016477:Artifacts; D002941:Circle of Willis / Q000033:anatomy & histology; D017352:Echo-Planar Imaging / Q000379:methods; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011076:Polycarboxylate Cement; D012077:Renal Artery / Q000033:anatomy & histology; D014682:Vena Cava, Inferior / Q000033:anatomy & histology
D011076:Polycarboxylate Cement; C005506:polycarbonate