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Abstract #1285

Golden-angle Sparse Liver Imaging: Radial or Cartesian Sampling?

Li Feng1, Hersh Chandarana1, Tiejun Zhao2, Mary Bruno1, Daniel K Sodickson1, and Ricardo Otazo1

1Center for Advanced Imaging Innovation and Research (CAI2R), New York University School of Medicine, New York, NY, United States, 2Siemens Healthineers, New York, USA

This work compares golden-angle stack-of-stars sampling and golden-angle Cartesian sampling for free-breathing liver MRI with eXtra-Dimensional (XD) compressed sensing reconstruction. For Cartesian sampling, the phase-encoding steps in the ky-kz plane are segmented into multiple interleaves that rotate at a golden angle. Each interleave starts from the center (ky=kz=0) of k-space and follows a pseudo-radial pattern on a Cartesian grid. Results from this initial study suggest that golden-angle Cartesian sampling achieves higher effective spatial resolution than radial sampling, but it still suffers from residual ghosting artifacts due to respiratory motion for free-breathing liver imaging.

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