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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.
