Venous excess doppler ultrasound: What radiologists should know in 2026

Figure 3 Doppler waveform. A: Normal portal vein Doppler waveform demonstrating near-continuous flow with mild undulations above the baseline; B: Normal intrarenal venous Doppler waveform demonstrating continuous flow below the baseline with a concurrent arterial waveform above. The Doppler sample gate is positioned at the interlobar vessels, indicated by white arrows in the accompanying illustration.