In multigate systems employed in Doppler flow-imaging detectable velocities [4]. Moreover, they generally do not allow equipment, the velocities of targets located at different ranges along flow dynamics to be studied in detail, since in most cases only the ultrasound beam axis are simultaneously detected. Typically, to the presence or absence of moving scatterers within a vessel can reduce the computation efforts, this processing is aimed at extracting be appreciated, with no information provided about the density a single parameter (e.g., the mean velocity) from each signal. In this of scatterers moving at each velocity, or the possible distribution article, a novel ultrasound multigate instrument is presented capable of velocities simultaneously present in a same SV [5]. of providing a detailed analysis of Doppler signals originated from 64 These limitations can be overcome if flow is analyzed along different range cells. By means of a dedicated high-speed fast-Fourier a single line selected on the B-mode image, rather than over the transform processor, these signals are transformed into the frequency full image. This is obtained according to the multigate operation, domain without loss of information. The implementation of the new multigate system is described here, and the pieces of information in which for each pulse transmitted along one line, a number, M, which it can provide are discussed. Significant results obtained in of subsequent (range) gates is open in the receiver, and the vitro and in vivo demonstrate that the new instrument is capable of corresponding M Doppler signals are independently processed accurately reproducing the actual velocity profiles of the interrogated [6-13]. As a result, the velocity profiles within all possible flow.