Concurrent Magnetic Field Monitoring of EPI Time Series: Characterizing Encoding Field and Image Fluctuations Using Principal Component Analysis

Saskia Klein¹, Lars Kasper¹, Johanna Vannesjo¹, Maximilian Hberlin¹, Simon Gross¹, Benjamin Dietrich¹, Klaas P. Prssmann¹

In fMRI, changes in image intensity are induced by signal fluctuations, e.g. related to the brain metabolism (BOLD). They can also be caused by gradient system instabilities and drifts, leading to confounds in time series analyses.