Free-Breathing Pediatric MRI with Nonrigid Motion Correction and Acceleration
Joseph Yitan Cheng 1,2 , Tao Zhang 1,2 , Nichanan Ruangwattanapaisarn 3 , Marcus T. Alley 2 , Martin Uecker 4 , John M. Pauly 1 , Michael Lustig 4 , and Shreyas S. Vasanawala 2
Electrical Engineering, Stanford University,
Stanford, CA, United States,
Stanford University, Stanford, CA, United States,
Hospital, Mahidol University, Bangkok, Thailand,
Engineering and Computer Sciences, University of
California, Berkeley, CA, United States
The goal of this work is to develop and assess motion
correction techniques for free-breathing pediatric MRI.
First, a variable-density sampling and radial-like
phase-encode ordering scheme was developed for a 3D
Cartesian acquisition. Second, intrinsic multichannel
butterfly navigators were used to measure respiratory
motion. Lastly, these estimates were applied for both
motion-weighted data-consistency in an accelerated
imaging reconstruction, and for nonrigid motion
correction using a localized autofocusing framework.
With IRB approval and informed consent, 22 pediatric
patients were imaged, and representative features were
evaluated. With the proposed methods, diagnosable
high-resolution abdominal volumetric scans can be
obtained from free-breathing acquisitions that are
comparable to longer respiratory-gated scans.
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