Science communicator Mike Stone delves into how Doppler ultrasound applies the Doppler effect to measure blood flow velocities. By analysing frequency shifts in ultrasound waves reflected by moving blood cells, this technique aids in diagnosing conditions like blockages, clots, and heart abnormalities. The resource also covers the principles of ultrasound wave propagation, the role of piezoelectric crystals in transducers, and the various types of Doppler ultrasound imaging, including colour, power, and spectral Doppler. Emphasising its non-invasive nature, the resource highlights Doppler ultrasound’s safety and effectiveness in medical diagnostics.
Image: Colour Doppler image of the umbilical cord showing the main artery and vein. Credit: Vak Hospital Thailand