Recent years have seen dramatic developments in extracorporeal. ultrasonogr
aphy: Color, including-power Doppler ultrasonography, ultrasonography angio
graphy, harmonic imaging (tissue harmonic imaging and contrast harmonic ima
ging) and 3-dimensional ultrasonography (including virtual endoscopy).
In this report, we describe the present situation and the prospective outlo
ok for these new diagnostic modalities mainly on the basis of our own exper
iences.