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Fig 3. VE-ASL and intra-arterial DSA in 3 patients. Column 1, The circle of Willis as investigated with MRA, collapsed axial maximum intensity projection. Column 2, VE-ASL images. Column 3, DSA images following an ICA injection of contrast agent. Column 4, DSA images following a vertebrobasilar artery (VBA) injection of contrast agent. For the first patient, VE-ASL shows collaterals from the VBA supplying the right ICA territory (arrow in a). The right basal nuclei is supplied by the VBA (blue) and the contralateral ICA (green) in VE-ASL (arrowhead). In the second patient, the left ACA/MCA flow territory is supplied by the contralateral ACA (arrowhead) and the VBA (arrows in f and i). The right MCA flow territory of the third patient is supplied by the ipsilateral ACA and VBA (arrow).
