Which color is used to indicate positive Doppler shift in the described color map?

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Multiple Choice

Which color is used to indicate positive Doppler shift in the described color map?

Explanation:
In color Doppler imaging, colors encode the direction of motion via the Doppler frequency shift. A positive Doppler shift means the echo frequency increases, which corresponds to flow toward the transducer. The common convention is red for toward the transducer (positive shift) and blue for away from it (negative shift). Green or yellow aren’t used to indicate the sign of the Doppler shift in the standard map. Therefore, red is the color used to indicate a positive Doppler shift.

In color Doppler imaging, colors encode the direction of motion via the Doppler frequency shift. A positive Doppler shift means the echo frequency increases, which corresponds to flow toward the transducer. The common convention is red for toward the transducer (positive shift) and blue for away from it (negative shift). Green or yellow aren’t used to indicate the sign of the Doppler shift in the standard map. Therefore, red is the color used to indicate a positive Doppler shift.

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