Question

What do orange and blue colours on the blood represent in Doppler echo images?

a) The colours indicate whether the blood is moving toward or away from the probe.
b) Orange represents oxygenated blood, blue de-oxygenated blood.
c) The colours have no meaning; they are used to visualise the blood.
d) The colours describe the temperature of the blood. Orange is warm blood; blue is cooler blood.

Answer 1

The orange and blue colors on Doppler echo images represent the velocity of blood flow.

Step-by-step explanation:

The orange and blue colors in Doppler echo images represent the velocity of blood. The highest velocities are shown in orange, while the lowest velocities are shown in blue.

Doppler echo images use the Doppler shift of reflected sound waves to determine blood velocity. When blood is moving towards the probe, the frequency of the reflected sound is higher, resulting in the color orange. When blood is moving away from the probe, the frequency of the reflected sound is lower, resulting in the color blue.