1. A method of observing the operation of an invasive medical device comprising: operating an invasive medical device from an invasive medical device system to perform an activity within a body; operating an ultrasonic diagnostic imaging system to observe the invasive medical device by means of a real time three dimensional ultrasonic image; producing information with the invasive medical device system having coordinate information relating to the activity; and merging information from the invasive medical device system into the real time three dimensional ultrasonic image at a location in the ultrasonic image data which is determined from the coordinate information, wherein operating an ultrasonic diagnostic imaging system further comprises processing ultrasonic echo information to produce a real time three dimensional wire frame model of an anatomical region within a volumetric region of the body being imaged.