Table 4.

Criteria for true positive, false positive, true negative and false negative for hemorrhage on DECT and follow-up (FU) imaging.

	Hyper attenuation on DECT			Findings at FU
Diagnosis	VNC images	IOM	Conventional CT	Brain MRI
True positive (N = 2)	+	+/–	Persistant hyperattenuation	Brain hemorrhage
False positive (N = 0)	+	+/–	Washout	No brain hemorrhage
True negative (N = 32)	–	+/–	Washout	No brain hemorrhage
False negative (N = 1)	–	+/–	Persistant hyperattenuation	Brain hemorrhage

Note: + = hyperattenuation present; – = hyperattenuation absent; +/– = hyperattenuation present or absent.