Phase fMRI Reveals More Sparseness and Balance of Rest Brain Functional Connectivity Than Magnitude fMRI

Conventionally, brain functions are inferred from the magnitude data of the complex-valued fMRI output. Since the fMRI phase image (unwrapped) provides a representation of brain internal magnetic fieldmap (by a constant scale difference), it can also be used for brain function study from a perspective of direct representation of brain magnetic state. In this study, we collected a cohort of resting-state fMRI magnitude and phase data pairs from...