Fig. 3

Illustration of the quantitative accuracy assessment of gestational sac region segmentation. The yellow ellipse is an area (G) manually labeled by a doctor before the test, while the green ellipse indicates the segmentation area (S) predicted by the algorithm. The intersection area between S and G is the true positive predicted area (TP). FP (false positive predicted area) = S-TP; FN (false negative predicted area) = G-TP