1. An ultrasound imaging system using a knowledge-based image adjusting device for producing ultrasound images, comprising: a patient information database for storing patient information; a reference image database for storing reference image parameters; a similarity calculation unit, in communication with the patient information database and the reference image database, which compares patient information and corresponding reference image parameters, and determines a parameter with the highest similarity; and an image adjusting block, in communication with the similarity calculation unit, which selects a type of probe and automatically adjusts image settings of the selected probe based on the parameter with the highest similarity.