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Contrast enhancement and artifact reduction in magnetization-prepared MR angiography

✍ Scribed by R. Deichmann; F. Wiesmann; C. Hillenbrand; D. Hahn; A. Haase

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
176 KB
Volume
10
Category
Article
ISSN
0899-9457

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✦ Synopsis

A method for the contrast enhancement and reduction of artifacts in three-dimensional (3D) magnetization-prepared (MP) magnetic resonance angiography (MRA) sequences is presented. A common artifact in these sequences is a periodical signal loss inside the vessels at the slab-slab junctions due to progressive saturation of the blood spins. This effect may be overcome by numerical optimization of the excitation pulses in dependence on sequence-related and physiological parameters. The feasibility of this method is shown in a phantom and an in vivo experiment by visualization of the carotid arteries and intracranial vessels. Furthermore, a method for contrast enhancement in MRA by data postprocessing is proposed, based on appropriate filtering of k-space data before Fourier transformation. This method is tested in two in vivo experiments by visualization of the arteries in the head and leg of healthy volunteers.

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