Table 4.

Contribution of optional contrasts to classifier performance.

Data set	Detection type	Δ AUC	Δ Sensitivity (%)	Δ Specificity (%)
Internal	Abnormality	0.01	2	1
	Acute hemorrhage	0.01	− 2	6
	Acute infarct	0.00	0	0
	Mass effect	0.01	3	1
External	Abnormality	0.00	0	0
	Acute hemorrhage	0.01	− 2	3
	Acute infarct	0.00	0	0
	Mass effect	0.01	2	− 2

Positive values denote that the model performance was higher with all available contrasts than with only mandatory contrasts.