A measuring and display by ultrasonic echography of physiological parameters of a blood flow.

A measuring and display of physiological parameters of a blood flow (10) comprising a measuring unit (300) by ultrasonic echography, the speed V (t, z) of said flow as a function of time t and z depth exploration. According to the invention, the measurement of the speed V (t, z) being independent of the frequency of the used ultrasonic wave, said measuring and display device comprises, at the output of a memory (304) for storing the values the speed V (t, z), on the one hand a multiplexer (401) which, for a given time t, registered in a register i of a memory (402) the number Ni (t) of samples of measurement having the value Vi to DELTAV closely DELTAV being the discretization step, and, secondly, a device (403) for displaying the speed as a function of time such that the brightness at the point (Vi, t) is proportional to Ni (t). Application to the ultrasound exploration blood flow in the vessels.