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Fig. 4 —Scatterplot of artery–lesion enhancement time for each
vascular malformation. All high-flow vascular malformations show an
artery–lesion enhancement time of less than 10 sec. High-flow vascular
malformations show shorter artery–lesion enhancement time than low-flow
malformations, with overlap between the two. Use of a threshold
artery–lesion enhancement time of 5 sec would result in 100% (6/6)
sensitivity and 60% (6/10) specificity for differentiation of high-flow from
low-flow malformations. Note: artery–lesion enhancement time = interval
from beginning of enhancement of an arterial branch in vicinity of lesion in
same slice to onset of enhancement in lesion. Start of arterial enhancement is
defined as 0 sec. Number next to 
is number of patients at that
enhancement time.
