Figure 5. Axial maximum intensity projections (MIPs). The MIPs are of very high quality with detailed depiction of distal vessels and excellent background suppression in the cases of no intentional motion (A and B). The trained motion causes clear misregistration between vessels in the brain (C, red arrow). Further, many distal vessels are lost on the motion corrupted image (C, yellow arrow), and there are artifactual stenoses (C, green arrow). With prospective motion correction, the misregistration and the distal vessels are mostly recovered, and pseudostenosis is corrected.

Figure 4. Sagittal (A, B, C, D) and coronal (E,F,G,H) maximum intensity projections (MIPs). Without intentional motion (A, B, E, F), activation of PMC does not substantially alter image quality. With trained motion, some vessels in the middle slab are obscured (yellow arrows) (C,G) without PMC. There are artifactual stenoses between slabs (green arrows). There is also misalignment between slabs (G, red arrow) and discontinuous major vessels, e.g. the middle cerebral arteries (G). In comparison, the obscured vessels are recovered when PMC was on and misalignment alleviated (D, H).