Investigative radiology
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Magnetic resonance angiography (MRA) is noninvasive and does not require the application of high doses of contrast agents, and thus is used in the clinical routine for evaluation of cerebrovascular diseases, eg, aneurysm and arteriovenous malformations. However, more subtle microvascular disease usually cannot be seen with the resolution capabilities of standard field strength MRA. The purpose of this study was to evaluate the ability of 7-T time-of-flight (ToF) MRA to depict the arterial brain vasculature and to compare the results to data from 1.5 T and 3 T. ⋯ Because of its considerably enhanced potential to depict vessels of the Circle of Willis and its first- and second-order branches, ToF MRA at 7 T may become an important tool in future neuroradiology research and clinical care.
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Investigative radiology · Aug 2008
Comparative StudyFollow-up of coiled cerebral aneurysms: comparison of three-dimensional time-of-flight magnetic resonance angiography at 3 tesla with three-dimensional time-of-flight magnetic resonance angiography and contrast-enhanced magnetic resonance angiography at 1.5 Tesla.
To compare three-dimensional (3D) time-of-flight (TOF)-magnetic resonance angiography (MRA) at 3 T with 3D TOF-MRA and ultrafast contrast-enhanced (CE)-MRA at 1.5 T and to determine the optimum MRA sequence for follow-up of cerebral aneurysms treated with Guglielmi detachable coils (GDCs). ⋯ TOF-MRA follow-up of coiled aneurysms is better at 3 T than at 1.5 T; nevertheless, greater definition of residual patency is achieved with ultrafast CE-MRA at 1.5 T.