title: Angiographic imaging with 2D RF pulses.
abstract: 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.
authors.affiliation: Department of Radiology, Stanford University, California 94305-5488, USA.
authors.forename: M T
authors.initials: MT
authors.lastname: Alley
authors.forename: J M
authors.initials: JM
authors.lastname: Pauly
authors.forename: F G
authors.initials: FG
authors.lastname: Sommer
authors.forename: N J
authors.initials: NJ
authors.lastname: Pelc
mesh_terms: 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
chemical_list: D011076:Polycarboxylate Cement; C005506:polycarbonate