The video window shows the video signal from your ultrasound system. A ROI (1) can be traced in the video windows, where both the IMT and the diameter are computed.
The windows contains also the calibration line for the B-mode image (2) once this has been calibrated (see Calibrate the B-Mode image).
The video controls bar (3) is located at the bottom of the window. The bar has different controls according to the video modality:Video control bar - online or Video control bar - offline).