FIGURE 1.

(A) The 2D phase contrast slice in the basal ganglia (BG) is located at the bottom of the corpus callosum (solid line). (B,C) Cerebral perforating arteries detected in the BG with 3 tesla (T) MRI (B) and 7T MRI (C) and included in the analysis are circled in green. Cerebral perforating arteries excluded from analysis due to a non-perpendicular orientation or close proximity to other perforating arteries (<1.2 mm) are circled in red. Note that for this subject all detected vessels at 3T were sufficient for inclusion. Also note the inhomogeneity in the background suppression at 7T (darker central area), which is induced by the well-known inhomogeneity of the radiofrequency B₁⁺ transmit field (resulting in spatially varying flip angle) at 7T MRI (Van De Moortele et al., 2005).