This paper introduces a new type of B-ultrasonic system based on PCI bus. Using the ample software and hardware resource of personal computer

this system achieves as good image quality as top grade B-ultrasonic diagnosis systems

and offers stronger functions than general low-end ones with comparatively cheap price. Its performance can sufficiently meet common needs of ordinary users. This system can accomplish functions that traditoional B-ultrasonic diagnosis equipment can't do

such as multiframe image replaying

storage

processing and transmission of ultrasonic images

superposition of characters and remote diagnosis

etc. The unique featrue of this system is that it uses PCI bus to import the B-ultrasonic image into the personal computer in real time and utilize the computer terminal to display the image. The scan mode used by this system is D/4. This paper discusses the D/4 scan mode

the PCI interface mode

and the functions of the system modules.