Table 1.

The AU, annotated labels, and required operations per AU in each step of CIMT video annotation process

	EUF selection	ROI localization	CIMT measurement
AU	ECG signal	EUF frame	One-pixel-wide column in ROI
Labels	EUF	ROI	Lumen-intima interface
	Non-EUF	Carotid bulb	Lumen-intima interface
		Background	Background
Operations	3 clicks	1 click	2 clicks