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FIG 3. Patient with high-grade stenosis of the right ICA and occlusion of the left ICA.
A, An StdTTP map from DSC-MR imaging using a T2*-weighted echo-planar fast-field–echo sequence (74/30/1 [TR/TE/excitation]) with a 30° flip angle, a 240-mm field of view, and a 128 x 128-voxel acquisition matrix. Each color step codes a time interval of 0.5 s. In the left hemisphere, the stdTTP is markedly prolonged in the anterior and posterior border zones (shift from normal dark red to gray) and in the central territory of the middle cerebral artery (shift from normal yellow to red or magenta). The vascular territory adjacent to the central region shows a shift to blue and gray values comparable with that of border zones. This was interpreted as a result from atherosclerotic small vessel disease, because the morphologic examination showed no related lesion. On the right side, the stdTTP was moderately prolonged, shown as moderate increases in magenta and blue voxels in the border zones.
B, Corresponding T1-weighted image (500/15/2) after IV administration of contrast medium.
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