Colour Doppler methods represent an important progress in diagnostics of vascular diseases. Conventional spectral and colour imaging of blood flow velocity have been during last years completed by new modalities, such as power Doppler, application of echocontrast agents, contrast harmonic imaging and tissue Doppler imaging. These new methods have improved diagnostics in several ways, especially in identification of small vessels, in detection of low flows and in perfusion assessment.

        Key words: Ultrasonography - Doppler methods - Colour coding