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Abstract #0318

Fat-Separated Radial 3D bSSFP Imaging at Low Field Using Frequency-Sweep RF Saturation and XD-GRASP Reconstruction

Ruoxun Zi1, Hersh Chandarana1, and Kai Tobias Block1
1Center for Biomedical Imaging, Department of Radiology, NYU School of Medicine, New York, NY, United States


Low-field systems have recently gained interest because of the potential to make MRI more accessible, but the field reduction comes at expense of low SNR and challenges with fat suppression. This work describes a new concept for fat separation at low field, based on radial acquisition during frequency-sweep RF saturation and combined with frequency-resolved XD-GRASP reconstruction. The approach is demonstrated for free-breathing abdominal imaging using a radial stack-of-stars 3D bSSFP sequence at 0.55T, showing that fat and water can be reliably distinguished based on the response to saturation at different frequencies. Fat-suppressed composite images can be calculated as final step.

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