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Abstract #1597

Tracking Discrete Off-resonance markers with Three Spokes (trackDOTS) a new motion tracking methodology

Jos P. Marques 1 , Daniel Gallichan 2 , and Rolf Gruetter 2,3

1 CIBM, Department of Radiology, University of Lausanne, Lausanne, Vaud, Switzerland, 2 LIFMET, cole Polytechnique Fdrale de Lausanne, Vaud, Switzerland, 3 CIBM, Department of Radiology, University of Lausanne and Geneva, Vaud, Switzerland

In this work we evaluate the possibility to perform motion tracking of a subjects head by using small MR markers containing a liquid which is off-resonance in respect to water. TrackDOTS is able to determine the position of various MR markers with 3 orthogonal k-space readouts by constructing receive coil modes that limit the sensitivity to regions of the various markers. The methodology was demonstrated in vivo showing high correlation between the motion parameters obtained using conventional MR image co-registration and the proposed methodology.

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