Abstract #1460
Self-Gating of Respiratory Motion for Pulmonary Ultra Short Echo Time MRI of Infants in the NICU
Andrew D. Hahn 1 , Xuefeng Cao 2,3 , Nara S. Higano 2,4 , Jean A. Tkach 5 , Robert P. Thomen 2,4 , Scott K. Nagle 1,6 , Gregory Lee 2 , Kevin M. Johnson 1 , Sean B. Fain 1,6 , and Jason C. Woods 2,4
1
Department of Medical Physics, University of
Wisconsin - Madison, Madison, Wisconsin, United States,
2
Center
for Pulmonary Imaging Research, Cincinnati Childrens
Hospital Medical Center, Cincinnati, Ohio, United
States,
3
Department
of Physics, University of Cincinnati, Cincinnati, Ohio,
United States,
4
Department
of Physics, Washington University in St Louis, St.
Louis, Missouri, United States,
5
Department
of Radiology, Cincinnati Childrens Hospital Medical
Center, Cincinnati, Ohio, United States,
6
Department
of Radiology, University of Wisconsin - Madison,
Madison, Wisconsin, United States
The repeated sampling of the k-space center, or dc
component, in 3-D center-out radial ultra short echo
time (UTE) magnetic resonance imaging (MRI) can serve as
a self-navigator for retrospective respiratory gating.
We utilize this important feature to retrospectively
reconstruct 3-D UTE pulmonary MRI at end-expiration and
end-inspiration in non-sedated neonatal intensive care
unit (NICU) patients, where respiratory rates,
mechanical ventilation, and positioning can preclude
bellows belt and pencil navigators. Gated images at
end-inspiration and end-expiration provide estimates of
tidal volumes and can better resolve structural
abnormalities in bronchopulmonary dysplasia than ungated
images.
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