Abstract: A time gain compensation technique is applicable for use with ultrasound imaging systems, including systems having digital architecture. The time gain compensation apparatus of the present invention comprises a time gain compensation curve generator and the ability to drive the time gain compensation curve generator to provide digital generation of the time gain compensation curve. Digital generation of the time gain compensation curve is achieved by an initial gain and data represented by a series of slopes and associated time-dependent break-points.

Abstract: A doppler dead zone avoidance method is used in an ultrasound imaging apparatus to avoid the situation where time of flight equals PRI, or the time between doppler firings. Initially, range gate size and transmit parameters are optimized. This optimization of range gate size and transmit parameters is used to minimally adjust an operator selected velocity scale, as needed. Higher velocity scales can be achieved, based on optimization and minimization.