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(上接第63页)Sothebloodflowsignalsandspectralfeaturesarethemostsuitablesignsforselectingpatientsforconservativetreatment.Patientshadahighsuccessfulrateofconser鄄vativetreatmentwhentherewereafewbloodflowsignalsandlowflowresistance(RI=0.4)ofthemassperipheral