Abstract #3628
Pseudo-Polar trajectories achieve high acceleration rates with high image fidelity: experiments at 3T and 7T
Ali Ersoz 1 and L Tugan Muftuler 2,3
1
Department of Biophysics, Medical College of
Wisconsin, Milwaukee, Wisconsin, United States,
2
Department
of Neurosurgery, Medical College of Wisconsin,
Milwaukee, Wisconsin, United States,
3
Center
for Imaging Research, Medical College of Wisconsin,
Milwaukee, Wisconsin, United States
Conventional radial imaging requires interpolation onto
Cartesian grid, which might degrade image quality.
Pseudo-Polar Fourier Transform (PPFT) is a direct, exact
and fast transformation between the k-space data in
pseudo-polar (PP) grid and image in Cartesian grid. In
this study, we incorporated GRAPPA into PPFT
reconstruction and compared it with the conventional
radial GRAPPA using simulations, 3T phantom experiments
and 7T human experiments. Both simulation and
experimental results demonstrated that PP trajectory
provides images with significantly reduced
reconstruction errors and sharper edge resolution
compared to conventional radial trajectory even at high
acceleration rates.
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