They were divided into 7 groups by injection site, method and concentration of contrast medium while each group contains 10 cases.
按注射部位，注射方式和对比剂浓度分成7组，每组10例，分别经单侧肘前静脉、下肢静脉、双侧肘前静脉注射对比剂。
They were divided into 7 groups by injection site, method and concentration of contrast medium while each group contains 10 cases.
按注射部位，注射方式和对比剂浓度分成7组，每组10例，分别经单侧肘前静脉、下肢静脉、双侧肘前静脉注射对比剂。
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