1. CTP.
CTP. Chronic left internal carotid artery occlusion. A, Baseline. B, After ACZ administration. There is significant hypoperfusion in the left hemisphere at baseline with decreased CBF and increased TTP (A, short arrows). After administration of ACZ (B), CBF decreases throughout the left hemisphere, resulting in negative calculated CVR percentages. The left-sided TTP increases even further in post-ACZ flow maps as seen by the accentuated asymmetry (B, long arrows). Note the normal increase in the right-sided CBF after the vasodilatory stimulus of ACZ (B, arrowheads).
A.S. Vagal et al. AJNR Am J Neuroradiol 2009;30:
©2009 by American Society of Neuroradiology