Abstract #1316

Motion detection in spectroscopy using FID navigators

Ryan Kalmoe¹, Edward J Auerbach¹, Malgorzata Marjańska¹, Patrick J Bolan¹, Ivan Tkac¹, Tobias Kober^2,3,4, and Gregory J Metzger¹

¹Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, ²Advanced Clinical Imaging Technology, Siemens Healthcare AG, Lausanne, Switzerland, ³Department of Radiology, University Hospital (CHUV), Lausanne, Switzerland, ⁴LTS5, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

A free induction decay navigator (FIDnav) was implemented in a spectroscopic sequence to identify motion-corrupted spectra for retrospective rejection. An optimal channel combination of a weighted sum of channels based on the magnitude of a localized water reference signal allowed for improved identification of motion events. The FID navigator successfully detected motion events in both phantom studies and in vivo for both single voxel spectroscopy (SVS) and 2D chemical shift imaging (CSI). Removal of the motion-corrupted data based on the FIDnav is demonstrated to show improved spectral quality.

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