Figure 10.

This artifact from clothing ornament – hyperintense signal on FLAIR sequence – may raise the suspicion of subarachnoid hemorrhage. (A). Gradient echo sequences (B) and DWI (C) are very sensitive to artifacts, especially those produced by metallic objects. The artifacts are almost invisible in SE/T1-weighted sequence (D) and in FSE/T2 (E – note that only the lens in the right eye ball shows abnormal signal intensity). Sagittal projection shows directly the source of the artifact located on the arm (F – FSE/T2, sag).