The test sensitivity is high, even regret coincidence epithelial thickening or trauma of erosion: false positive, false positive but the white boundary is not clear or not.

此试验敏理性较高，巧合匀悔上皮增厚或外伤糜烂处赤露假阳性，但假阳性变白其界限不清或不规矩。

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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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