Abstract #0049

Breathing-induced B0 field fluctuations in the cervical spinal cord at 7T

Signe Johanna Vannesjo¹, Falk Eippert¹, Yazhuo Kong¹, Stuart Clare¹, Karla L Miller¹, and Irene Tracey¹

¹FMRIB centre, NDCN, University of Oxford, Oxford, United Kingdom

Spinal cord MRI at ultra-high field poses considerable technical challenges, especially related to static and dynamic B₀ field variations. We here investigated the magnitude and spatial profile of breathing-induced B₀ field fluctuations in the cervical spinal cord at 7T, by comparing field maps acquired during breath-holds in an expired vs. inspired breathing state. Breathing-related field fluctuations of up to 140Hz at the level of C7 were observed. We further implemented a proof-of-principle shim correction, demonstrating the feasibility of using the shim system to compensate for the breathing-induced fields.

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