Erschienen in:
05.03.2016 | Research Article
High resolution imaging of the intracranial vessel wall at 3 and 7 T using 3D fast spin echo MRI
verfasst von:
Chengcheng Zhu, Henrik Haraldsson, Bing Tian, Karl Meisel, Nerissa Ko, Michael Lawton, John Grinstead, Sinyeob Ahn, Gerhard Laub, Christopher Hess, David Saloner
Erschienen in:
Magnetic Resonance Materials in Physics, Biology and Medicine
|
Ausgabe 3/2016
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Abstract
Objectives
High resolution MRI of the intracranial vessel wall provides important insights in the assessment of intracranial vascular disease. This study aims to refine high resolution 3D MRI techniques for intracranial vessel wall imaging at both 3 and 7 T using customized flip angle train design, and to explore their comparative abilities.
Materials and methods
11 patients with intracranial artery disease (four atherosclerotic plaques, six aneurysms and one reversible cerebral vasoconstriction syndrome) were imaged at 3 and 7 T with a 3D T
1-weighted fast-spin-echo sequence (SPACE) both pre and post Gd contrast injection. Wall to lumen contrast ratio (CRwall-lumen), contrast enhancement ratio (ER) and the sharpness of the vessel wall were quantified. Two experienced radiologists evaluated the image quality on a 0–5 scale.
Results
Both 3 and 7 T achieved good image quality with high resolution (nominal 0.5 mm isotropic) and whole brain coverage. The CRwall-lumen and the ER measurements were comparable (p > 0.05). The 7 T images were significantly sharper (sharpness: 2.69 ± 0.50 vs. 1.88 ± 0.53 mm−1, p < 0.001) with higher image quality (reader 1 score: 3.5 ± 1.1 vs. 2.4 ± 1.1, p = 0.002) compared to 3 T.
Conclusions
3D T
1-weighted SPACE can be used for intracranial vessel wall evaluation at both 3 and 7 T. 7 T provides significantly better image quality and improves the confidence of diagnosis.