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 excitat...

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Bibliographic Details
Published inMagnetic resonance in medicine Vol. 37; no. 2; p. 260
Main Authors Alley, M T, Pauly, J M, Sommer, F G, Pelc, N J
Format Journal Article
LanguageEnglish
Published United States 01.02.1997
Subjects
Abdomen - blood supply
Algorithms
Aorta, Abdominal - anatomy & histology
Circle of Willis - anatomy & histology
Echo-Planar Imaging - methods
Humans
Image Enhancement - methods
Magnetic Resonance Angiography - methods
Models, Theoretical
Phantoms, Imaging
Polycarboxylate Cement
Renal Artery - anatomy & histology
Vena Cava, Inferior - anatomy & histology
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Summary: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.
ISSN:0740-3194
DOI:10.1002/mrm.1910370220