1. A method for producing three dimensional ultrasonic images of the interior of a body comprising the steps of: transmitting ultrasonic waves over a volumetric region of the interior of the body; receiving ultrasonic Doppler information signals from spatial locations within said region; processing said ultrasonic Doppler information signals to determine the Doppler power intensity received from said locations within said region; and displaying said Doppler power intensity on a spatial basis in a three dimensional presentation.