Table 4.

Input slice number experimentation.

	Internal dataset: Stanford	External dataset: Intermountain
Metric (AUROC)
PENet—1 slice	0.48 [0.45–0.51]	0.51 [0.47–0.54]
PENet—6 slices	0.57 [0.53–0.60]	0.58 [0.55–0.59]
PENet—12 slices	0.74 [0.70–0.77]	0.69 [0.67–0.72]
PENet—24 slices	0.84 [0.82–0.87]	0.85 [0.81–0.88]
PENet—48 slices	0.80 [0.77–0.83]	0.83 [0.76–0.86]

AUROC on the internal test set (Stanford) and external test set (Intermountain) with 95% confidence interval: smaller input slice number does not provide enough structural information to learn while too many input slices makes pulmonary embolism hard to detect.