回波图像

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。

Gloucester's inability to see the truth echoes the discussion between Goneril and Regan at the end of Act I, scene i, about Lear's unreliability in his old age: the "infirmity of his age"(Ii 291 ) and his "unconstant starts"(Ii 298 ) evoke images of senility and suggest that his daughterrs ought to take control from him, just as Edmund is taking control from Gloucester.

格洛斯特无法看到的真相回波之间的讨论和里根Goneril结束时，法一，现场字母i约李的可靠性晚年：在"体弱，他的年龄"（二291 ）和他的" unconstant启动"（二298 ）衰老引起的图像，并建议他daughterrs应该采取控制他，就像埃德蒙是控制从格洛斯特。

Based on the priori knowledge of a point scattering - hyperbolic feature of subsurface objects in GPR B-Scan images, a method of ROI extraction with Neural Network is presented.

在分析了均匀介质中的目标回波特征一双曲线形态的产生机理和基本特征的基础上，提出了一种利用神经网络进行ROI提取的方案，根据GPR数据解译的特点，本文设计了相应的B-Scan图像预处理方法和神经网络结构、训练及测试方法，使用塑料管及其他目标的B-Scan实测数据对神经网络进行训练与测试。

Gloucester's inability to see the truth echoes the discussion between Goneril and Regan at the end of Act I, scene i, about Lear's unreliability in his old age: the "infirmity of his age"(Ii 291 ) and his "unconstant starts"(Ii 298 ) evoke images of senility and suggest that his daughterrs ought to take control from him, just as Edmund is taking control from Gloucester.

格洛斯特无法看到的真相回波之间的讨论和里根Goneril结束时，法一，现场字母i约李的可靠性晚年：在&体弱，他的年龄&（二291 ）和他的& unconstant启动&（二298 ）衰老引起的图像，并建议他daughterrs应该采取控制他，就像埃德蒙是控制从格洛斯特。

Killed and about 1 000 were injured as Dujuan rampaged across Guangdong. Power supplies in

岭及流浮山气压的变化情形，图3.4.4和3.4.5是杜鹃的卫星图像及雷达回波图。

Sound reflection and sound shadow of high frequency imaging sonar detecting sea mine underwater was simulated with computer.

对高频图像声纳探测水雷的回波和声影进行计算机仿真。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。