Abstract #0032
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
1
Electrical Engineering, Stanford University,
Stanford, CA, United States,
2
Radiology,
Stanford University, Stanford, CA, United States,
3
Ramathibodi
Hospital, Mahidol University, Bangkok, Thailand,
4
Electrical
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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