Software analysis of 20 MHz pulsed Doppler quadrature data

A computer software procedure for processing quadrature data obtained from a 20 MHz pulsed Doppler system is described and the quality of results obtained is illustrated. The system is implemented on a standard laboratory minicomputer system. Software flexibility expands use of this high resolution device for measuring blood velocity to larger vessels than previously demonstrated. Techniques for dealing with high frequency aliasing, time delays, digital filtering and sampling intervals are included.