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AJNR - American Journal of Neuroradiology

Published ahead of print on September 10, 2008
doi: 10.3174/ajnr.A1259

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Collateral Circulation Imaging: MR Perfusion Territory Arterial Spin-Labeling at 3T

B. Wu^a,b, X. Wang^a,b, J. Guo^b, S. Xie^a, E.C. Wong^c, J. Zhang^b, X. Jiang^a and J. Fang^b

^a Department of Radiology, Peking University First Hospital, Beijing, China
^b Interdisciplinary Academy, Peking University, Beijing, China
^c Center for Functional Magnetic Resonance Imaging and Departments of Radiology and Psychiatry, University of California, San Diego, La Jolla, Calif

View larger version (49K): [in this window] [in a new window]   Fig 1. VE processing steps in a volunteer. Top, Positioning and orientation of the labeling area on a section of TOF MRA dataset. The labeling area is shown in the first image as the whole section, in the second image as the right (R) and left (L) ICA, and in the third image as ICAs and posterior circulation. Middle, Raw CBF map and reconstruction of separated vascular territories. Bottom, 3-Color selective CBF map is constructed by a combination of the general CBF map with the vascular territory map. Examples of regions of interest present the CBF values and percentages of left, right ICA, and posterior circulation.

View larger version (97K): [in this window] [in a new window]   Fig 2. The A1 segment and PcomA flow pattern on MRA and VE-ASL investigations in 6 patients with ICA stenosis. Each row of images represents a patient. Column 1, Maximum intensity projections (MIPs) of the circle of Willis as investigated with 3D MRA. Column 2, 2D-PC images that are phase-encoded in the left-right (LR) direction. Black arrow shows the direction of the black color. Column 3, 2D-PC images that are phase-encoded in the anteroposterior (AP) direction. White arrow shows the direction of the white color. Column 4, VE-ASL images. Red, green, and blue indicate the right ICA, left ICA, and posterior circulation, respectively.

View larger version (78K): [in this window] [in a new window]   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).