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Doppler Ultrasound: Color Flow Mapping & Aliasing (2D)

Interactive 2D color-flow Doppler ultrasound lab: watch a vessel cross-section colored live by its real Doppler shift, and see the classic red-to-blue aliasing artifact appear at the vessel center when the pulse-repetition-frequency's Nyquist velocity limit is exceeded.

Medical Technology & Imaging Physics2DAdvanced60 FPS📱 Mobile-adapted⇄ 3D version

A real-time 2D model of pulsed-wave color Doppler ultrasound: a vessel cross-section is scanned along its length, and every horizontal streamline is colored live by its own true Doppler shift, exactly the way a clinical color-flow map works. Push the peak velocity or lower the pulse repetition frequency far enough and the unambiguous Nyquist limit is exceeded at the vessel center first — the color map wraps and flips from red to blue in the middle of the jet, reproducing the aliasing artifact sonographers see and correct for every day at the bedside.

⚙ Under the hood

Interactive 3D color Doppler ultrasound lab: a transducer insonates pulsatile blood flow through a vessel while every simulated blood cell is colored live by its true Doppler shift, revealing the classic red-to-blue aliasing artifact when the pulse-repetition-frequency's Nyquist velocity limit is exceeded.

ultrasounddopplermedical-imagingaliasingcardiovascularbiophysics

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install