High resolution motion compensated contrast-free free-breathing 3D CMRA at 7T using single transmit coil
Shubhajit Paul1, Raphael Tomi-Tricot1,2, Camila Munoz1, Karl Philipp Kunze1,2, Shaihan Malik1,3, Joseph V. Hajnal1,3, Philippa Bridgen1,3, Thomas Wilkinson1,3, Sharon Giles1,3, Radhouene Neji1,2, Reza Razavi1, Claudia Prieto1,4, and René Michael Botnar1,4
1School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom, 2MR Research Collaborations, Siemens Healthcare Limited, Frimley, United Kingdom, 3The London Collaborative Ultra high field System (LoCUS), London, United Kingdom, 4Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Santiago, Chile
3D cardiovascular MR imaging at ultra-high field (7T) is very challenging due to magnetic-field inhomogeneity (B0 and B1), SAR constraints and also the coil-depth issues of surface coils. To our best knowledge this is the first report demonstrating contrast-free ultra-high resolution (0.7mm3 isotropic) free-breathing 3D CMRA images with translational respiratory motion compensation. To avoid SAR constraints imposed by the use of T2-preparation pulses, high excitation flip-angles are exploited to obtain high contrast between the coronary arteries and myocardium. This technique may be adopted for clinical applications to produce high-resolution cardiac MR images at 7T scanners.
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