In spectral Doppler, flow toward the transducer is indicated by which velocity sign relative to the baseline?

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Multiple Choice

In spectral Doppler, flow toward the transducer is indicated by which velocity sign relative to the baseline?

Explanation:
In spectral Doppler, velocity is plotted along a axis with zero at the baseline, and the sign of the velocity encodes direction along the ultrasound beam. Flow toward the transducer produces a positive Doppler shift, which is displayed as a positive velocity. Flow away from the transducer yields a negative velocity, and zero velocity means no movement along the beam. Undefined velocity isn’t used because a definite sign is always assigned to the measured Doppler shift.

In spectral Doppler, velocity is plotted along a axis with zero at the baseline, and the sign of the velocity encodes direction along the ultrasound beam. Flow toward the transducer produces a positive Doppler shift, which is displayed as a positive velocity. Flow away from the transducer yields a negative velocity, and zero velocity means no movement along the beam. Undefined velocity isn’t used because a definite sign is always assigned to the measured Doppler shift.

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