Which color represents flow that is at 90 degrees to the sound beam?

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Multiple Choice

Which color represents flow that is at 90 degrees to the sound beam?

Explanation:
Flow that is at 90 degrees to the sound beam produces no Doppler frequency shift because the velocity component along the beam is zero. Color Doppler encodes velocity along the beam, so without any shift there is no color information to display. The region therefore appears black, indicating no color signal. The other colors would only appear if there were a measurable Doppler shift from flow along the beam, which isn’t the case at a 90-degree angle.

Flow that is at 90 degrees to the sound beam produces no Doppler frequency shift because the velocity component along the beam is zero. Color Doppler encodes velocity along the beam, so without any shift there is no color information to display. The region therefore appears black, indicating no color signal. The other colors would only appear if there were a measurable Doppler shift from flow along the beam, which isn’t the case at a 90-degree angle.

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