目的减少对乳腺癌的漏诊，降低假阴性率，提高针吸细胞学诊断的准确性。
Objective to reduce missed diagnosis and false negative diagnosis and to improve the accuracy of fine needle aspiration cytology (FNAC).
恶性肿瘤首次常规超声引导穿刺活检假阴性率为9.4%（21/224）。
The false negative rate of malignant liver tumors in the first biopsy procedure guided by conventional ultrasound was 9.4% (21/224).
然而，假阴性率高、结果不稳定等因素严重阻碍着该技术的广泛应用，在石蜡组织中尤其如此。
However, the major obstacle to use technique as a routing is its high false negative rates and inconstant results, especially in paraffin-embedded tissues.
因为腋窝前哨淋巴结活检的假阴性率低，故对前哨淋巴结阴性的病人可以不做进一步腋窝淋巴结清扫。
Because the low false negative rate of SLN biopsy, the technique allows axillary lymph node dissection (ALND) avoided if the SLN is negative.
对160名病人和320名正常人进行判别的结果与通常采用的大便潜血试验比较，假阴性率降低到23.75%。
The comparison of 160 cases and 320 controls tested with those examined by fecal occult blood test has exhibited a decrease to 23.750% in the false negative rate.
未发现SLN无转移而盆腔其余淋巴结存在转移者，SLN对盆腔淋巴转移的预测准确性为100%，假阴性率为0。
No one had positive pelvic lymph node and negative SLN, The predictive rate was 100% and the false -negative rate was zero.
同时还分析了核素心肌显像可能出现假阴性和假阳性的原因以及有效防止假阳性率升高的手段。
Besides, the reasons that gated myocardial tomography appeared false negative and false positive was analysed, and the means of reducing false positive was described.
结果此复检方案的阳性符合率和阴性符合率均为100%，未出现假阳性和假阴性。
Results The coincident rate for positive of reexamination methods was 100% and for negative was 100%. There was not false positive result and false negative result.
上述结果表明全身骨扫描阳性符合率为36.6％（11/30），无假阴性。
The above results showed that positive accuracy rate of bone scanning was 36.6 per cent(11/30) without false positive.
颈中央区淋巴结转移率最高(46.8%)，并且小的转移淋巴结ct不能发现而出现5例假阴性。
Metastatic rate of lymph node in neck central area was the highest (46.8%), but micrometastasis of lymph node couldn't be found with CT leading to false negative in 5 cases with PTC.
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%。
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%。
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%.
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