Arjen Lindenholz

66 CHAPTER 3 Figure 7. An example of a free induction decay (FID) artifact in a 3T precontrast T 1 -weighted vessel wall image (voxel size 0.5 x 0.5 x 1.0 mm 3 ). A dashed pattern is seen over the left hemisphere (white arrowheads). When the artifact is present at the same location of a vessel wall (open arrowhead) it hampers interpretation of vessel wall abnormalities. Figure 8. 85-year-old male with a recent occlusion of the left MCA, successfully treated with mechanical thrombectomy. (A) Intra-arterial Digital Subtraction Angiography (DSA) directly before the mechanical thrombectomy procedure, showing an acute cut-off in the MCA (white arrow). (B) On the 7T T 1 -weighted MPIR-TSE image, clear vessel wall enhancement in the MCA can be seen at the location of the M1-M2 segment (white arrow) where the thrombectomy device removed the occluding thrombus.