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Abstract #0768

Auto-Calibrated Parallel Imaging Using the Unused Echo in Alternating TR SSFP

Hsu-Lei Lee1, Yoon-Chul Kim1, Ajit Shankaranarayanan2, Krishna S. Nayak1,3

1Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA; 2Global Applied Science Lab, GE Healthcare, Menlo Park, CA, USA; 3Keck School of Medicine, University of Southern California, Los Angeles, CA, USA

Low-resolution high-SNR k-space data can be acquired during the often-unused short TR echo of alternating TR SSFP. Although exhibiting a slightly different tissue contrast from the final image, this data can still be used to perform auto-calibration of the coil sensitivity map and GRAPPA kernel. We demonstrated R=2 GRAPPA reconstructed cardiac cine images using this method, where this ACS signal is acquired at the same time as the reduced-FOV image and eliminates the need for additional scan time.