B-flow技术是利用数字编码超声技术实现灰阶图像下血流回声直接显示的一种成像技术,它能将血液中微弱的流动的散射体回声信号进行增强,并抑制周围组织信号,能提高传统CDFI较难发现的亚临床型VC患者的反流阳性率,对临床症状不明显的亚临床型VC早期诊断有重要意义。
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