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Abstract #5037

Real-Time Motion Detection for Structural Brain Imaging Using Multi-Coil FID Navigators

Tobias Kober1,2, Jos P. Marques1,3, Rolf Gruetter1,4, Gunnar Krueger2

1Laboratory for functional and metabolic imaging, Ecole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland; 2Advanced Clinical Imaging Technology, Siemens Suisse SA - CIBM, Lausanne, Switzerland; 3Department of Radiology, University of Lausanne, Switzerland; 4Departments of Radiology, Universities of Lausanne and Geneva, Switzerland

Subject motion is often affecting the quality of MRI data. In this work, we investigate the feasibility to detect motion by monitoring repetitive FID navigator signals from arrays of receive coils. Object motion is shown to induce changes in the FID signal intensity. For proof of concept, the technique was applied to structural MP-RAGE scans of the brain. Subject motion was reliably detected. The technique has the potential to provide a scan quality measure and motion parameters for real-time or retrospective correction. It could be used in other MR sequences without time or signal penalty.