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• W2068281610 abstract "High spatial resolution fMRI provides a more precise estimate of brain activity than low resolution fMRI. The magnitude and phase parts of the BOLD signals are impacted differently by changes in the scan resolution. In this paper, we report on a numerical simulation to show the impact of spatial resolution upon the complex-valued BOLD signal in terms of magnitude and phase variation. We generate realistic capillary networks in cortex voxels, calculate the BOLD-induced magnetic field disturbance and the complex BOLD signals for the voxel and its subvoxels, and thereby characterize the magnitude and phase behaviors across multiple grid resolutions. Our results show that: 1) at higher spatial resolution there is greater spatial variation in the phase of the BOLD signal as compared to its magnitude; 2) the spatial variation of the phase signal monotonically increases with respect to spatial resolution while for the magnitude the spatial variation may reach a maximum at some resolution level; 3) voxels containing large capillaries have higher phase spatial variation than those with smaller capillaries; 4) the amplitude spatial variation at a resolution level increases with respect to relaxation time whereas the phase variation is generally unaffected." @default.
• W2068281610 created "2016-06-24" @default.
• W2068281610 creator A5032850756 @default.
• W2068281610 creator A5076857616 @default.
• W2068281610 date "2010-07-16" @default.
• W2068281610 modified "2023-10-16" @default.
• W2068281610 title "Magnitude and phase behavior of multiresolution BOLD signal" @default.
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• W2068281610 doi "https://doi.org/10.1002/cmr.b.20164" @default.
• W2068281610 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2947032" @default.
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