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FIG 2. MR images obtained 1 d after SAH in patient 3 show acute SAH with no change in cerebral blood flow. Nonenhanced CT scan (not shown) showed a typical anterior circulation hemorrhage.
A, Fast spin-echo fluid-attenuated inversion recovery (6000/96/1800 [TR/TE/TI]) MR image shows SAH in the basal cisterns as areas of high signal intensity.
B, Field-echo T2*-weighted (588/30 [TR/TE]) MR image shows SAH in the basal cisterns as areas of low signal intensity.
C, Diffusion-weighted image shows no restriction of diffusion.
D, Perfusion image shows two selected regions of interest.
E, Map of the time to peak shows normal, symmetric patterns.
F, Map of the cerebral blood flow shows normal, symmetric patterns.
G, Maximum intensity projection of the time-of-flight MR angiogram data shows an anterior communicating aneurysm (arrow).
H, Plot of time versus signal change shows a symmetric curve.
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