Table 4:

Matrix documenting the number of unneeded rescans and recalls created by the DL approach with different thresholds, assuming that the series were scanned to rule out stroke^a

	DL (T = 0.5)		DL (T = 0.1)		DL (T = 5e–4)		DL (T = 1e–6)
	Rescans	Recalls	Rescans	Recalls	Rescans	Recalls	Rescans	Recalls
D1	25	0	16	0	11	0	4	0
D2	15	1	8	3	3	3	0	7
D3	20	0	13	2	8	2	3	4
D4	17	1	10	3	6	4	2	7
D5	20	1	12	1	7	1	2	3
Mean ± SD	19.4 ± 3.8	0.4 ± 0.2	11.8 ± 1.4	1.8 ± 1.3	7 ± 2.9	2 ± 1.6	2.2 ± 1.5	4.2 ± 3

^aAll numbers are from the 49 test series. Here D1–D5 represent the same individuals as in Tables 1 and 2. Physician D0, whose ratings were used to train the DL algorithm, is now absent (as in Table 2) because no “stroke” ratings were available for this reader.