查询词典 at the threshold of

Materials and Methods:236 pathology-confirmed breast lesions(155 malignanty,81 benignancy) and 221 disease-free contralateral breast tissues were examined using EPI-DWIb values=0,1000 s/mm~2TR/TE=8400ms/93.8ms; FOV=30×30cm;matrix=128×128;ASSET=2,slice thickness=4mm.DCE-MR imaging was also performed for accurate location of the lesion using VIBRANT sequence.The mean ADC values of malignant and benign lesions and the disease-flee contralateral breast tissues were calculated from the ADC map for each patient.One-way analysis of variance was applied to compare the mean ADCs of malignant lesions with benign lesions and disease-flee contralateral breast tissues.The threshold ADC value for malignant lesion was determined using a receiver operating characteristic(ROC curve analysis.Each lesion was classified into two major types:mass and non-mass lesion.The diagnostic performance of DWI was compared in breast mass and non-mass lesions.Results:155 malignant and 81 benign lesions were confirmed in 236 lesions.

材料与方法：搜集术前行乳腺MR检查并经穿刺或手术病理证实的236例乳腺病变，以对侧正常乳腺腺体作为正常对照，采用横轴位的平面回波-扩散加权成像序列，TR=8400ms，TE=93.8ms，层厚=4mm，激励次数=2：视野=30×30cm，矩阵=128×128，ASSET=2，b值=0和1000s/mm~2；参考动态增强图像准确定位，测量病变区和对侧正常乳腺腺体的ADC值，应用t检验比较良、恶性病变及正常腺体ADC值的差异，采用接收者工作特征曲线(receiver operating characteristic curve，ROC)确定良恶性病变的ADC界值；根据BI-RADS MRI将乳腺病变按照形态学表现分为肿块性病变和非肿块性病变两组，比较ADC值在肿块和非肿块性病变中定性诊断的效能。

The effect of decision threshold on OCDMA system BER performance is analyzed.

理论分析了接收机判决阈值的选取对OCDMA系统BER性能的影响。

The experimental results have shown that the impact of TFT threshold-voltage variation on the biasing circuit can be reduced from 30% to 5% under biasing voltage of 3 V.

因此，在第六章中，本论文提出具有临界电压补偿功能之偏压电路设计技术，此技术可以大幅降低元件的变动对偏压电路的影响，提高类比电路在玻璃基板上之可行性。

Pregabalin also increased the mechanical withdrawal threshold of the paw bilaterally, but only with 100 mg/kg.

当剂量达100 mg/kg时，普瑞巴林也可以双侧性的增加爪子的机械退缩阈值。

A threshold signature scheme based on the bilinear mapping tool was proposed.

使用双线性映射工具，提出基于双线性对的门限签名方案。

Identity-based threshold signature is studied in this dissertation, and all identity-based schemes in this dissertation are based on bilinear pairings.

本文对基于身份的门限签名进行了研究，文中所涉及的基于身份的方案都是基于双线性对的。

It is difficult to choose the threshold value when the histogram of images is not evidently bimodal.

图像的直方图双峰不明显时，选择分割阈值就很困难。

Those have two important properties:the threshold decomposition and the stack properties,which ensure that the filtering process go on in binary field parallelly.

它所具有的阈值分解和堆栈两个重要性质保证了滤波过程可以在二进制域并行实现。

Including : Threshold Sharpening, according to two binary gradient images operation.

包括：门限锐化，根据梯度二值化图像等操作。

There was 1 case of binaural hearing threshold shift in the study group with three-year incidence of 3.1%.

研究组中有1例发生双耳听闭位移。3年发病率为3.1%。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。