Table 3. Per-lesion sensitivity of the models for metastasis detection.

Lesion volume (cm3)	T1 + CE		T1		CE
	Internal test	External test	Internal test	External test	Internal test	External test
≤ 0.5	0.457 (37/81)	0.667 (16/24)	0.136 (11/81)	0.542 (13/24)	0.296 (24/81)	0.333 (8/24)
> 0.5 to ≤ 1.0	0.814 (179/220)	0.743 (26/35)	0.450 (99/220)	0.686 (24/35)	0.459 (101/220)	0.600 (21/35)
> 1.0 to ≤ 2.0	0.915 (183/200)	0.794 (27/34)	0.705 (141/200)	0.735 (25/34)	0.725 (145/200)	0.588 (20/34)
> 2.0	0.990 (98/99)	0.988 (81/82)	0.980 (97/99)	0.890 (73/82)	0.889 (88/99)	0.927 (76/82)
Total	0.828 (497/600)	0.857 (150/175)	0.580 (348/600)	0.771 (135/175)	0.597 (358/600)	0.714 (125/175)

Data in parentheses are raw number (i.e., numerator/denominator).

T1 = non-contrast T1-weighted image, CE = contrast-enhanced fat-suppressed T1-weighted image