Abstract #3103

Two-Dimensional Respiratory-Motion Characterization for Continuous MR Measurements Using Pilot Tone Navigation

Lea Schroeder¹, Jens Wetzl^1,2, Andreas Maier^1,2, Robert Rehner³, Matthias Fenchel⁴, and Peter Speier⁴

¹Pattern Recognition Lab, Department of Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany, ²Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany, ³Magnetic Resonance, Research and Development, Hardware, Siemens Healthcare GmbH, Erlangen, Germany, ⁴Magnetic Resonance, Product Definition and Innovation, Siemens Healthcare GmbH, Erlangen, Germany

Pilot Tone signals, generated by a commercial signal generator and received with standard MR local coils, were analyzed for multidimensional respiratory information. The ground truth for respiratory motion in two orthogonal directions ($$$\boldsymbol{g}_{SI}$$$ and $$$\boldsymbol{g}_{AP}$$$), generated by sagittal image streams of the right liver dome using standard fluoroscopic sequences, showed excellent correlation with the PT signal derived from a separate measurement (for $$$\boldsymbol{g}_{SI}$$$: 0.90 $$$\pm$$$0.13; for $$$\boldsymbol{g}_{AP}$$$: 0.82 $$$\pm$$$0.21). Our results demonstrate that PT navigation can provide two-dimensional characterization of regular and irregular respiratory motion without interfering with the MR measurement.

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