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Abstract #0752

Spatiotemporal analysis of breathing-induced fields in the cervical spinal cord at 7T

S. Johanna Vannesjo1, Karla L. Miller1, Stuart Clare1, and Irene Tracey1

1FMRIB centre, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom

Time-varying B0 fields related to breathing is one major source of image artifacts in spinal cord imaging at ultra-high field. Here we aim to measure spatial and temporal characteristics of breathing-induced fields in the cervical spinal cord at 7T. We perform a principal component analysis on field measurements based on fast gradient-echo images acquired during free breathing. We observed field variations of about 30Hz at C7 during normal breathing. Furthermore, we observed that a single principal component explained over 90% of the field variance during normal and deep breathing.

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