Figure 9
From: Volumetric BOLD fMRI simulation: from neurovascular coupling to multivoxel imaging
(a1) and (a2) corrA for the magnitude-vs-susceptibility correlations with respect to T E = [0, 60] ms, two vasculatures of radii = 2 and 4 micron, and three voxel sizes (see legend); (b1) and (b2) corrP for the corresponding phase-vs-fieldmap correlations. It is shown that a long TE may increase corrA but decrease corrP, and that both corrA and corrP decrease as image resolution refines. It is reminded that corrA≠1 implies mismatch and nonlinearity of the mapping.