Improving Efficiency of Ultra-short Echo Time MRI in Neonatal Lungs with a FLORET Spiral Trajectory
Andrew D Hahn1,2, Nara S Higano3,4,5, Matthew M Willmering3,4,6, Neil J Stewart6,7, Jason C Woods3,4,5,6,8,9, and Sean B Fain1,2
1Department of Radiology, University of Iowa, Iowa City, IA, United States, 2Department of Medical Physics, University of Wisconsin, Madison, Madison, WI, United States, 3Division of Pulmonary Medicine, Cincinnati Children's Hospital, Cincinnati, OH, United States, 4Department of Radiology, Cincinnati Children's Hospital, Cincinnati, OH, United States, 5Department of Pediatrics, University of Cincinnati, Cincinnati, OH, United States, 6Center for Pulmonary Imaging Research, Cincinnati Children's Hospital, Cincinnati, OH, United States, 7POLARIS, Imaging Sciences, Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, United Kingdom, 8Department of Radiology, University of Cincinnati, Cincinnati, OH, United States, 9Department of Physics, University of Cincinnati, Cincinnati, OH, United States
State-of-the-art structural pulmonary MRI of neonatal intensive care unit patients has previously been performed using 3D radial UTE. Performance is high yet scan times can be 15 minutes or more due to the low sampling efficiency of radial trajectories. Here we explore FLORET UTE in this application and demonstrate comparable image quality to the state-of-the-art in approximately 25% of the scan time. Lung parenchymal SNR is maintained, and the spiral trajectory provides a higher parenchymal signal relative to muscle. Shorter scan times reduce the opportunity for bulk motion and risk to this sensitive population.
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