Meeting Banner
Abstract #0992

4D Flow Imaging in the Aorta at 7T: Impact of Dynamic RF Shimming and kt-Acceleration

Sebastian Schmitter 1 , Susanne Schnell 2 , Kamil Ugurbil 1 , Michael Markl 2 , and Pierre-Francois van de Moortele 1

1 Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 2 Department of Radiology, Northwestern University, Chicago, IL, United States

There is growing interest in using time-resolved 3D phase-contrast MRI with three-directional velocity encoding (4D flow MRI) for the assessment of aortic hemodynamics. Previous studies investigating intracranial 3D blood flow have shown that 4D flow MRI directly benefits from ultra-high fields (i.e.≥7T). However, at 7T short RF wavelength can result in areas void of transmit B1 (B1+), especially in the torso, requiring multi-channel B1+ methods. Here, we demonstrate successful 4D flow imaging in the entire thoracic aorta at 7T. Two critical methodological components are investigated: 1) dynamically applied multiple B1+ shim settings through the acquisition and 2) kt-Grappa acceleration.

This abstract and the presentation materials are available to members only; a login is required.

Join Here