A power map shows the range of colors corresponding to the power of the Doppler signal in a power mode display.

Amplitude map is a color Doppler display in which the color corresponds to the amplitude of the Doppler signal.

Color saturation is a characteristic used for example to describe the vividness of a color, or the gradation of hue from unsaturated (white) to fully saturated (100% of the given color).

See also Directional Indicators, and Power Map.

In power mode the amplitude (power) of color Doppler signals is displayed, regardless of the velocity. Power does not have negative values and is independent of sampling frequency. An aliasing artifact does not occur in power mode images. Caused by plotting the quantity enhanced by echo contrast agents in a power map, power mode is often used in contrast Doppler ultrasound examinations.
Also known as energy mode.

The Doppler signal from any range gate is proportional to the number of red blood cells moving through during the periods of its read out, so the amplitude (or loudness) works as an indicator of the number of blood cell reflectors.
High Doppler amplitudes are generated by large pulsed Doppler or color Doppler imaging range gates and large vessels.

See also Amplitude Map, Color Amplitude Imaging.