Non-Linear Phase Evolution: The Dominant Source of the Average Frequency Difference between Grey Matter & White Matter in Gradient Echo MRI?

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accounted accurately achieved active aged approximately assess astronomy best brain channel clearly coil commonly compartment component composition confirm consequence considered consistent content contrast contribution cortical created curve dashed decayed decaying dependent dominant drawn equipped evolution evolve excellent exchange expected fiber field filtered fitted fitting frequency generating gives gradient gray guide head healthy highly human identified implies inclusions indeed indicate indicates inferred investigation invisible iron kernel kingdom larger linear linearly local long longer magnitude mainly male maps measured mechanisms model monotonically nearby nonlinear observation occur occurs offset offsets optic outside particularly pass peter physics plot plotted postulated previously properly quantitative radiations radius rapidly reason receive recently remove represent representative resolution reversed rise scaling scanner school sense several sharp short shorter simple since slice source sources spatial spoiled strengths strongly subjects subtracting suggested suggests susceptibility throughout tissue tracts underlying unwrapped variation versus volume water white yielded zero