What information does the z-axis (brightness) on the Doppler spectrum provide?

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Multiple Choice

What information does the z-axis (brightness) on the Doppler spectrum provide?

Explanation:
On a Doppler spectrum, the horizontal axis represents velocity (the Doppler shift), while the vertical brightness encodes how strong the signal is at each velocity. That brightness is the amplitude (or spectral power) of the Doppler-shifted echoes. So the z-axis tells you how much flow signal exists at that velocity—higher brightness means a larger amplitude at that velocity, not the velocity itself, bandwidth, or a separate frequency shift.

On a Doppler spectrum, the horizontal axis represents velocity (the Doppler shift), while the vertical brightness encodes how strong the signal is at each velocity. That brightness is the amplitude (or spectral power) of the Doppler-shifted echoes. So the z-axis tells you how much flow signal exists at that velocity—higher brightness means a larger amplitude at that velocity, not the velocity itself, bandwidth, or a separate frequency shift.

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