Table 1.

Image-level dataset characteristics.

Modality	Dataset role	N images	Median width (px)	Median height (px)	Width range (px)	Height range (px)
2D ultrasound	Held-out internal 2D ultrasound test	382	955	538	407–1,135	266–794
2D ultrasound	Development pool; deterministic 697/123 train/validation split	820	956	538	319–1,135	270–794
Contrast-enhanced ultrasound	CEUS domain-shift stress test	170	553	552	330–888	218–657

Values summarize image-level records from the public dataset package.