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INTRODUCTIONWith the continuous development of technology of colorful Doppler fluid image(CDFI) and occurrence of detecting head of high frequency,vascular diseases can be clearly diagnosed,and even small vessels and blood stream can be clearly shown.;It also presents the advantages of harmlessness,painlessness,simple performance,exactaion,high specificity,lower price and easy for follow up and patients are willing to accept it.