[New applications of echography: Doppler ultrasonography]

The Doppler effect, the different types of Doppler echography its functions and the parameters to evaluate the blood flow are defined. The clinical applications of Doppler in paediatrics are analyzed which are grouped in four great chapters: 1) cerebral blood flow. 2) renal flood flow: a.-native kidney, b.-transplanted kidney. 3) hepatic blood flow: a.-native liver, b.-transplanted liver. 4) characterization of mass, tissue and structures. Exploration technique of different organs are described and findings in different clinical sectors are referred to, emphasizing normal patterns.