Earlier works demonstrated applications of Quantitative Susceptibility Mapping (QSM) in functional MRI, including both task- and resting-state experiments. The focus had been mostly on the bi-directional activations consistently observed in fQSM. In this work, our aim was to compare the temporal and frequency characteristics of susceptibility and magnitude time-course signals. Importantly, we also included cardiac and respiration signals, and showed that the global susceptibility signal might inherently include more physiological information than the magnitude.
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