The results showed that the coincidence rate of sign (positive or negative) is 90% for calculation and experimental values which are basically in the same magnitude.

结果表明，计算值和实验值的正负号一致率为90%，并基本处于同一数量级。

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Considering MRA as the standard, the sensibility of diagnosing abnormal vessels by TCD was 78.10%, specificity 94.22%, false positive 7.46%, false negative 23.31%, and the coincidence rate 89.36%.

以磁共振血管成像为标准，比较经颅多普勒超声发现相应血管病变数，得出诊断异常血管的特异性为94.22%、敏感性为78.10%、假阳性为7.46%，假阴性为23.31%及符合率为89.36%。

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