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FIG 6. Visual differentiation between turbulence signals and embolic signals. Turbulence signals showed a high intensity area in the center of the systolic phase of the Doppler flow waveform and were usually accompanied by jet flow velocity, harsh noise, and reversed flow. However, embolic signals were featured as high intensity points that randomly superimposed on the flow waveform of either the systolic or diastolic period, accompanied by harmonic chirps.
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