FIG 2. Patient with high-grade stenosis of the left ICA.

A, An stdTTP map obtained using DSC-MR imaging with a T2*-weighted echo-planar fast-field–echo sequence (74/30/1 [TR/TE/excitations]) with a 30° flip angle, a 240-mm field of view and 128 x 128-voxel acquisition matrix. Each color step codes a time interval of 0.5 s. The left hemisphere still shows a small region of normal perfusion within the CVTs (yellow voxels). In the anterior and posterior border zones, stdTTP is significantly prolonged, visible as an increase of voxels shifting color from normally dark red to blue and gray. A slight prolongation of stdTTP in the anterior and posterior border zones in the right hemisphere (color shift to magenta to blue) was not significant.

B, Corresponding T1-weighted image (500/15/2) after IV administration of contrast medium.