Abstract #3413

Optimised navigator correction of physiological field fluctuations in multi-echo GRE of the lumbar spinal cord at 3T

Laura Beghini¹, Gergely David^2,3, Martina D. Liechti³, Silvan Büeler³, and S. Johanna Vannesjo¹

¹Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway, ²Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Zurich, Switzerland, ³Dept. of Neuro-Urology, Balgrist University Hospital, University of Zurich, Zurich, Switzerland

Synopsis

Keywords: Artifacts, Spinal CordMulti-echo GRE sequences acquired in the spinal cord are sensitive to breathing-related field variations, leading to ghosting artifacts. While navigator-based corrections are often used in the brain to account for field variations, standard implementations often fail in the spinal cord due to the close proximity to the lungs. Here, we investigated optimised navigator corrections including a fast Fourier transform combined with region selection encompassing the spinal canal. Besides a visual improvement of image quality, the optimised navigator correction yielded statistically significant improvements in the CNR between WM and CSF and the SNR in the WM.

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