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During duplex optimization, a duplicate spectral waveform appears below the baseline at high gain. What is the most defensible next step?
Document bidirectional flow as pathology
Increase Doppler gain and wall filter together because a cleaner trace is more important than low-flow sensitivity
Use the first visible color signal for placement and avoid changing scale or angle once flow is displayed
Suspect mirror artifact or crosstalk and reduce gain or adjust angle
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