A new technological breakthrough is ongoing with the advent of massive parallel computing capabilities. This technology is the enabler to a new concept: ultrafast ultrasound imaging. UltraFast Doppler enables frame rate increases by a factor of 5 to 10 compared to conventional color Doppler, typically from 60 up to 200Hz, without sacrificing field of view or spatial resolution. Complex flow dynamics and transient flow event can be visualized in a much more accurate manner. Potential clinical benefits of this emerging technology include increased measurement accuracy and increased efficiency in patient management. Stenosis grading in carotids or calculation of resistance indexes in renal arteries could tremendously benefit from this technology.