Arjen Lindenholz

90 CHAPTER 4 Figure 2. Sample images in the axial plane of the 7 different scan variants performed at 3T (precontrast; in order of decreasing scan duration). Both distal intracranial internal carotid arteries (white arrowheads) with the bifurcation of the posterior communicating artery are depicted surrounded by CSF. 1. T 1W VISTA variant 1 (8:24min). 2. PD W VISTA variant 2 (7:50 min), adjusted from Qiao et al. 19 3. T 1W VIRTA variant 3 (6:42min). 4. T 1W VIRTA variant 4 (6.01min). 5. T 1W VISTA variant 5 (5:52min), adjusted from Qiao et al. with a shorter TR. 19 6. T 1W VISTA variant 6 (5:49min). 7. T 1W VIRTA variant 7 (4:39min). VISTA = volumetric isotropic turbo-spin-echo acquisition, VIRTA = volumetric isotropically reconstructed turbo-spin echo-acquisition Figure 3. Sample images in sagittal plane of the 7 different scan variants performed at 3T (precontrast; in order of decreasing scan duration). The right MCA (black arrowheads) is depicted in all images, surrounded by CSF and brain parenchyma. 1. T 1W VISTA variant 1 (8:24min). 2. PD W VISTA variant 2 (7:50 min), adjusted from Qiao et al. 19 3. T 1W VIRTA variant 3 (6:42min). 4. T 1W VIRTA variant 4 (6.01min). 5. T 1W VISTA variant 5 (5:52min), adjusted from Qiao et al. with a shorter TR. 19 6. T 1W VISTA variant 6 (5:49min). 7. T 1W VIRTA variant 7 (4:39min). VISTA = volumetric isotropic turbo-spin-echo acquisition, VIRTA = volumetric isotropically reconstructed turbo-spin echo-acquisition