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Brandts, Anne; Roes, Stijntje D.; Doornbos, Joost; Weiss, Robert G.; de Roos, Albert; Stuber, Matthias; Westenberg, Jos J.M.

Right coronary artery flow velocity and volume assessment with spiral K‐space sampled breathhold velocity‐encoded MRI at 3 tesla: Accuracy and reproducibility

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  • Media type: E-Article
  • Title: Right coronary artery flow velocity and volume assessment with spiral K‐space sampled breathhold velocity‐encoded MRI at 3 tesla: Accuracy and reproducibility
  • Contributor: Brandts, Anne; Roes, Stijntje D.; Doornbos, Joost; Weiss, Robert G.; de Roos, Albert; Stuber, Matthias; Westenberg, Jos J.M.
  • imprint: Wiley, 2010
  • Published in: Journal of Magnetic Resonance Imaging
  • Language: English
  • DOI: 10.1002/jmri.22144
  • ISSN: 1053-1807; 1522-2586
  • Keywords: Radiology, Nuclear Medicine and imaging
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:sec><jats:title>Purpose:</jats:title><jats:p>To evaluate accuracy and reproducibility of flow velocity and volume measurements in a phantom and in human coronary arteries using breathhold velocity‐encoded (VE) MRI with spiral <jats:italic>k</jats:italic>‐space sampling at 3 Tesla.</jats:p></jats:sec><jats:sec><jats:title>Materials and Methods:</jats:title><jats:p>Flow velocity assessment was performed using VE MRI with spiral <jats:italic>k</jats:italic>‐space sampling. Accuracy of VE MRI was tested in vitro at five constant flow rates. Reproducibility was investigated in 19 healthy subjects (mean age 25.4 ± 1.2 years, 11 men) by repeated acquisition in the right coronary artery (RCA).</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>MRI‐measured flow rates correlated strongly with volumetric collection (Pearson correlation r = 0.99; <jats:italic>P</jats:italic> &lt; 0.01). Due to limited sample resolution, VE MRI overestimated the flow rate by 47% on average when nonconstricted region‐of‐interest segmentation was used. Using constricted region‐of‐interest segmentation with lumen size equal to ground‐truth luminal size, less than 13% error in flow rate was found. In vivo RCA flow velocity assessment was successful in 82% of the applied studies. High interscan, intra‐ and inter‐observer agreement was found for almost all indices describing coronary flow velocity. Reproducibility for repeated acquisitions varied by less than 16% for peak velocity values and by less than 24% for flow volumes.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>3T breathhold VE MRI with spiral <jats:italic>k</jats:italic>‐space sampling enables accurate and reproducible assessment of RCA flow velocity. J. Magn. Reson. Imaging 2010;31:1215–1223. © 2010 Wiley‐Liss, Inc.</jats:p></jats:sec>