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Abstract #4871

Motion-Corrected Multiphase Imaging with Steady-state Free Precession for Free-breathing 3D Coronary Angiography

Kwang Eun Jang1,2, Dwight G. Nishimura2, and Shreyas S. Vasanawala3
1Department of Bioengineering, Stanford University, Stanford, CA, United States, 2Magnetic Resonance Systems Research Lab (MRSRL), Department of Electrical Engineering, Stanford University, Stanford, CA, United States, 3Department of Radiology, Stanford University, Stanford, CA, United States


For free-breathing 3D coronary angiography, we consider a new multiphase acquisition that consists of a series of short imaging blocks to reduce motion blur in the acquisition window. However, this approach poses two challenges: (1) because the alterations of readout gradient waveforms become large due to the shortened imaging window, eddy current artifacts appear in steady-state free precession imaging, and (2) motion among cardiac phases needs to be addressed. In this work, we propose a new ordering scheme to establish smooth transitions between conic interleaves. Phase-to-phase motion is estimated using self image-based navigators and corrected by motion-based reconstruction.

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