An integrative model for neuronal activity-induced signal changes for gradient and spin echo functional imaging

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The physiological origin of task-evoked systemic artefacts in functional near infrared spectroscopy (2012, background): “It was theoretically (Jensen and Chandra, 2000) and experimentally (Uludag et al., 2009) shown that the relaxation rate of blood water molecules, diffusing in the inhomogeneous field of by red blood cells can be described by the following relationship: 1 T2;Hb ¼ 114 S Σ DeoxyHbð Þ Σ DeoxyHbð Þ þ Σ…”
Pushing spatial and temporal resolution for functional and diffusion MRI in the Human Connectome Project (2013, background): “…of field dependent elevations in intrinsic image SNR (Vaughan et al., 2001), supra-linear increases in the susceptibility based BOLD contrast (e.g. Ogawa et al., 1993; Uludag et al., 2009), and improvements in the spatial accuracy of functional mapping signals (Ugurbil et al., 2003a, 2003b).”
Resting-state fMRI in the Human Connectome Project (2013, background): “5 mm at full-width-at-half-maximum (FWHM) caused by the dominant draining vein contribution at this field strength (Uludağ et al., 2009).”
The WU-Minn Human Connectome Project: An Overview (2013, background): “Additionally, higher fields increase the relative sensitivity to the microvasculature in BOLD-based functional images (Ogawa et al., 1993; Ugurbil et al., 2003; Uludag et al., 2009), resulting in a smaller point spread function (Shmuel et al., 2007).”