Figure 4

Model performance based on clinical scenario for stroke code test sets: (a–d) Histograms demonstrating the number of true positive (TP) and false negative (FN) studies for different ground truth volumes (a), NIH Stroke Scales (b), time intervals between last seen well and MRI (c), and time intervals between symptom onset and MRI (d). The images from the false negative studies with ground truth volume > 1 mL are included in Supplementary Fig. S9. As an example of the time intervals, a patient who presents at 8 am having gone to sleep without symptoms at 10 pm and woken with symptoms at 6 am will have time from last seen well of 10 h and time from symptom onset of 2 h.