Robust Self-Gated Free-Breathing 3D Cardiac MRI Using DC Signals and Virtual Coils
Xinwei Shi1,2, Joseph Y Cheng1,2, Michael Lustig3, John M Pauly2, and Shreyas S Vasanawala1
1Radiology, Stanford University, Stanford, CA, United States, 2Electrical Engineering, Stanford University, Stanford, CA, United States, 3Electrical Engineering and Computer Science, UC Berkeley, Berkeley, CA, United States
In cardiac MRI, self-gating using the DC signal
provides a promising alternative to EKG gating. However, the DC signal is often
affected by other moving structures in the FOV, such as the liver, which
degrades the accuracy of the extracted cardiac triggers. In this work, we
demonstrate the use of virtual coils to focus the DC signal on cardiac motion
and to provide a robust and generalized self-gating approach for 3D cardiac MRI.
In free-breathing 4D-Flow scans of pediatric subjects, the proposed method
improved the accuracy of self-gating triggers, and the self-gated images showed
comparable quality with EKG gated reference.
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