Traditional digital scan conversion accomplishes the joint of ultrasonic scan and displaying scan, provide a temporary memory for image, make the real time disposal of ultrasonic image be possible.

This paper describes the theory and technology of scan conversion． Then introduces the scan double chip AL251 and its application． The technology of converting interlaced scanning to progressive scanning can improve the image quality and be used to produce digital television

Digital Scan Converter in B-ultrasonic System;