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Supra‐aortic arteries: Three‐dimensional time‐resolved k‐t BLAST contrast‐enhanced MRA using a nondedicated body coil at 3 tesla in acute ischemic stroke
Author(s) -
Ferré JeanChristophe,
Raoult Hélène,
Breil Stéphane,
CarsinNicol Béatrice,
Ronzière Thomas,
Gauvrit JeanYves
Publication year - 2014
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.24466
Subject(s) - stenosis , medicine , magnetic resonance angiography , stroke (engine) , radiology , lumen (anatomy) , nuclear medicine , magnetic resonance imaging , acute stroke , confidence interval , cardiology , mechanical engineering , tissue plasminogen activator , engineering
Purpose To assess the image quality and diagnostic performance achieved by using supra‐aortic 3D‐TR‐CE‐k‐t BLAST MRA and a nondedicated body coil as compared with conventional CE‐MRA in patients with acute ischemic stroke. Materials and Methods In this prospective study, 36 consecutive patients with a suspected acute ischemic stroke underwent both k‐t BLAST MRA and conventional CE‐MRA. Image quality was assessed using visual and quantitative criteria and the techniques were compared. Both techniques were compared for degree of visual and quantitative measurement of carotid stenosis. Results Delineation of vessel lumen and overall diagnostic confidence were significantly better with CE‐MRA, respectively 3.4 ± 0.5 and 3.3 ± 0.6 (mean score ± SD), than with k‐t BLAST MRA, respectively 2.8 ± 0.4 and 2.9 ± 0.5 ( P < 0.02). SNR and CNR were significantly higher for k‐t BLAST MRA, respectively 33.5 ± 19.3 and 27.9 ± 19.3, than for CE‐MRA, respectively 25.7 ± 10 and 20.4 ± 8.4 ( P < 0.03). Intertechnique agreement was good for carotid stenosis characterization (κ = .763). For the 14 relevant stenosis, stenosis measurements were highly correlated between techniques (0.96; P < 0.0001). The Bland‐Altman plot showed a low bias in assessment of the degree of stenosis (mean bias 2.1% ± 7.7). Conclusion k‐t BLAST MRA using a nondedicated coil offering and dynamic information was a effective diagnostic tool for detection and characterization of carotid stenosis. J. Magn. Reson. Imaging 2014;40:1056–1063 . © 2013 Wiley Periodicals, Inc .