The work described here has been carried out within a collaborative project between DIST and ESAOTE BIOMEDICA aiming to set up a new ultrasonic scanner performing 3D reconstruction . A system is being set up to process and display 3D ultrasonic data in a fast , economical and user friendly way to help the physician during diagnosis. A comparison is presented among several algorithms for digital filtering , data segmentation and rendering for real time , PC based , three-dimensional reconstruction from B-mode ultrasonic biomedical images .Several algorithms for digital filtering have been compared as relates to processing time and to final image quality . Three-dimensional data segmentation techniques and rendering has been carried out with special reference to user friendly features for foreseeable applications and reconstruction speed.