FIG 3. Patient 5: 84-year-old woman with TIAs.

A, Angiogram shows 99% stenosis of the right ICA.

B, T2-weighted MR image shows a right posterior watershed infarction (arrowheads).

C, Corresponding MTT map shows extensive high signal intensity in the right MCA and ACA distributions.

D, Corresponding CBV map shows higher signal intensity in the right than in the left ACA distribution (arrows), indicating an elevation of CBV in the right ACA distribution. The higher CBV most likely represents brain parenchyma with maximal vasodilatation, while the lower CBV is most likely caused by neuronal loss (old infarction/gliosis) (arrowheads).