Ultrahigh-field MRI in human ischemic stroke - a 7 tesla study

Madai, V.I.; von Samson-Himmelstjerna, F.C.; Bauer, M.; Stengl, K.L.; Mutke, M.A.; Tovar-Martinez, E.; Wuerfel, J.; Endres, M.; Niendorf, T.; Sobesky, J.

Ultrahigh-field MRI in human ischemic stroke - a 7 tesla study

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Item Type:	Article
Title:	Ultrahigh-field MRI in human ischemic stroke - a 7 tesla study
Creators Name:	Madai, V.I., von Samson-Himmelstjerna, F.C., Bauer, M., Stengl, K.L., Mutke, M.A., Tovar-Martinez, E., Wuerfel, J., Endres, M., Niendorf, T. and Sobesky, J.
Abstract:	INTRODUCTION: Magnetic resonance imaging (MRI) using field strengths up to 3 Tesla (T) has proven to be a powerful tool for stroke diagnosis. Recently, ultrahigh-field (UHF) MRI at 7 T has shown relevant diagnostic benefits in imaging of neurological diseases, but its value for stroke imaging has not been investigated yet. We present the first evaluation of a clinically feasible stroke imaging protocol at 7 T. For comparison an established stroke imaging protocol was applied at 3 T. METHODS: In a prospective imaging study seven patients with subacute and chronic stroke were included. Imaging at 3 T was immediately followed by 7 T imaging. Both protocols included T1-weighted 3D Magnetization-Prepared Rapid-Acquired Gradient-Echo (3D-MPRAGE), T2-weighted 2D Fluid Attenuated Inversion Recovery (2D-FLAIR), T2-weighted 2D Fluid Attenuated Inversion Recovery (2D-T2-TSE), T2* weighted 2D Fast Low Angle Shot Gradient Echo (2D-HemoFLASH) and 3D Time-of-Flight angiography (3D-TOF). RESULTS: The diagnostic information relevant for clinical stroke imaging obtained at 3 T was equally available at 7 T. Higher spatial resolution at 7 T revealed more anatomical details precisely depicting ischemic lesions and periinfarct alterations. A clear benefit in anatomical resolution was also demonstrated for vessel imaging at 7 T. RF power deposition constraints induced scan time prolongation and reduced brain coverage for 2D-FLAIR, 2D-T2-TSE and 3D-TOF at 7 T versus 3 T. CONCLUSIONS: The potential of 7 T MRI for human stroke imaging is shown. Our pilot study encourages a further evaluation of the diagnostic benefit of stroke imaging at 7 T in a larger study.
Keywords:	Magnetic Resonance Imaging, Stroke
Source:	PLoS ONE
ISSN:	1932-6203
Publisher:	Public Library of Science
Volume:	7
Number:	5
Page Range:	e37631
Date:	31 May 2012
Official Publication:	https://doi.org/10.1371/journal.pone.0037631
PubMed:	View item in PubMed

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