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Doppler Ultrasound: Color Flow Mapping & Aliasing

Interactive 3D Doppler ultrasound lab: a transducer insonates pulsatile blood flow in a vessel, color-coding the Doppler shift live and revealing velocity aliasing when the Nyquist limit is exceeded — adjust peak velocity, insonation angle, transducer frequency and PRF.

Medical Technology & Imaging Physics3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

A real-time 3D model of pulsed-wave color Doppler ultrasound: a transducer insonates pulsatile blood flow through a vessel, and every simulated red blood cell is colored live by its 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 — 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

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install