目的探讨低机械指数实时超声造影在肝移植术后门静脉并发症诊断中的价值。

Objective To study the value of real time contrast-enhanced ultrasonography in the diagnosis of portal vein complications after liver transplantation.

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超声的此种特性，与超声的照射条件，如机械指数、脉冲重复频率、照射时间等有关。

Ultrasound-assisted gene delivery is associated with the parameters of ultrasound exposure, such as mechanical index, pulse repetition frequency, time of exposure, and so on.

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结果低机械指数谐波超声造影对恶性病变诊断的的敏感性、特异性和准确性分别为96%、90.7%和93.8%。

Results The sensitivity, specificity and accuracy of diagnosing malignant liver tumors by contrast-enhanced harmonic ultrasonography with low mechanical index were 96%? 90.7%? 93.8% respectively.

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