目的联合应用表观扩散系数(ADC)值及增强时间-信号曲线(TIC)图分析乳腺富血供病灶特点,并探讨两者的诊断价值。方法选取32例超声提示乳腺富血供病变在西门子3.0 T MR仪上行乳腺常规序列、DWI及3D动态增强扫描检查,以病理检查结果为诊断...目的联合应用表观扩散系数(ADC)值及增强时间-信号曲线(TIC)图分析乳腺富血供病灶特点,并探讨两者的诊断价值。方法选取32例超声提示乳腺富血供病变在西门子3.0 T MR仪上行乳腺常规序列、DWI及3D动态增强扫描检查,以病理检查结果为诊断标准,分析病灶的ADC值及TIC图与病理结果的相关性。结果 32例共36个病灶,动态增强MRI显示时间-信号曲线图17个为Ⅰ型(47.2﹪),7个为Ⅱ型(19.4﹪),12个为Ⅲ型(33.3﹪)。早期强化率有明显差异(P<0.05),峰值强化率无明显差异(P>0.05),ADC值有显著性差异(P<0.05)。ADC与TIC图之间具有明显的相关性。结论乳腺富血供病变诊断困难,因其病理基础不同表现出不同的MRI特征,ADC值测量及增强TIC图对病灶诊断及鉴别可提供重要参考价值,具有显著意义。展开更多
G821.19 20034266对第9届全运会男子50km竞走比赛中运动员技术犯规情况的调查=Investigation of technical foulsof male walkers in 50km speed walking race ofthe 9th China National Games[刊,中,A]/李东河,
The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the ...The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the soft soil foundation. After the dynamic characteristics are calculated in terms of natural frequencies and modes, the seismic analysis is carried out using the modal response spectrum method and the time-history method, respectively. Based on the calculated results, the reasonable design values are finally suggested as the basis of the seismic design of the bridge, and meanwhile the problems encountered were also analyzed. Finally, some conclusions are drawn as: 1) Despite the superiority of rigid-framed prestressed concrete bridge, the upper and lower ends of the piers of the bridge are proved to be the crucial parts of the bridge, which are easily destroyed under designed earthquake excitations and should be carefully analyzed and designed; 2) The soft soil foundation can possibly result in rather weakening of the lateral rigidity of the rigid-framed bridge, and should be paid considerable attention; 3) The modal response spectrum method, combined with time-history method, is suggested for the seismic analysis in engineering design of the rigid-framed prestressed concrete bridge.展开更多
文摘目的联合应用表观扩散系数(ADC)值及增强时间-信号曲线(TIC)图分析乳腺富血供病灶特点,并探讨两者的诊断价值。方法选取32例超声提示乳腺富血供病变在西门子3.0 T MR仪上行乳腺常规序列、DWI及3D动态增强扫描检查,以病理检查结果为诊断标准,分析病灶的ADC值及TIC图与病理结果的相关性。结果 32例共36个病灶,动态增强MRI显示时间-信号曲线图17个为Ⅰ型(47.2﹪),7个为Ⅱ型(19.4﹪),12个为Ⅲ型(33.3﹪)。早期强化率有明显差异(P<0.05),峰值强化率无明显差异(P>0.05),ADC值有显著性差异(P<0.05)。ADC与TIC图之间具有明显的相关性。结论乳腺富血供病变诊断困难,因其病理基础不同表现出不同的MRI特征,ADC值测量及增强TIC图对病灶诊断及鉴别可提供重要参考价值,具有显著意义。
文摘G821.19 20034266对第9届全运会男子50km竞走比赛中运动员技术犯规情况的调查=Investigation of technical foulsof male walkers in 50km speed walking race ofthe 9th China National Games[刊,中,A]/李东河,
文摘The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the soft soil foundation. After the dynamic characteristics are calculated in terms of natural frequencies and modes, the seismic analysis is carried out using the modal response spectrum method and the time-history method, respectively. Based on the calculated results, the reasonable design values are finally suggested as the basis of the seismic design of the bridge, and meanwhile the problems encountered were also analyzed. Finally, some conclusions are drawn as: 1) Despite the superiority of rigid-framed prestressed concrete bridge, the upper and lower ends of the piers of the bridge are proved to be the crucial parts of the bridge, which are easily destroyed under designed earthquake excitations and should be carefully analyzed and designed; 2) The soft soil foundation can possibly result in rather weakening of the lateral rigidity of the rigid-framed bridge, and should be paid considerable attention; 3) The modal response spectrum method, combined with time-history method, is suggested for the seismic analysis in engineering design of the rigid-framed prestressed concrete bridge.