Fig. 7.

B1-inhomogeneity artifacts on a 7 T MR FLAIR images of a 42-year-old female with a recent left-sided ischemic stroke. (A) A transverse 3 T FLAIR image, repetition time 10000ms, echo time 120ms, inversion time 2800 ms, acquired voxel size 0.75×1.27×4.00 mm³, reconstructed voxel size 0.4×0.4×4.0 mm³, field-of-view 230x182×129 mm³, scan duration 2:00 min. No B0- or B1-inhomogeneity artifacts are seen on the image. Some patient motion is present in the image. Two hyperintense lesions are present; along the posterior margin of the left putamen and in the left insular region (white arrowheads). (B) A transverse 7 T FLAIR image, repetition time 8000ms, echo time 300 ms, inversion time 2200 ms, acquired voxel size 0.8×0.8×0.8 mm³, reconstructed voxel size 0.5×0.5×0.5 mm³, field-of-view 250x250×190 mm³, scan time 10:48 min. The image is affected by B1-imhomogeniteity artefacts, best seen in both temporal lobes (white arrows). The two hyperintense lesions are seen in much more detail compared to the 3 T MR image in (A) (white arrowheads).