ad. 41. What is a color Doppler?

It is imaging, which with a help of color tones (e.g. red and blue) allows to assess a direction and, indirectly, speed of a blood flow in vessels and heart cavities. It is an essential technique during a fetal heart examination. It allows to visualize filling of ventricles and the activity of the heart valves. Thanks to its sensitivity, the color Doppler gives an opportunity to diagnose small defects in e.g. a ventricular septum, non-typical tubular connections or precisely expose small vessels difficult to localize through 2D imaging in a B mode.