Colour Doppler flow mapping: providing an insight into cardiac hydrodynamics.

Colour Doppler flow mapping can now provide spatial velocity information in relation to surrounding structural detail as imaged by conventional echocardiography and, as such, represents a major advance in non-invasive cardiac imaging. This article describes the basic principles of colour Doppler flow mapping, details how the Doppler information is processed and displayed to arrive at the real-time two-dimensional flow-enhanced image. Since colour Doppler flow mapping is really the first available technique which allows detailed real-time velocity information to be displayed in vivo and in relation to intracardiac structures, it can allow important insight into the haemodynamics of intracardiac flow. With the application of digital computer analysis techniques it may also be possible to extract valuable quantitative information from colour Doppler flow mapping.