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动态强化     
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  dynamic enhancement
     Significant difference in the dynamic enhancement parameters, SI Time curve patterns and MVD was found between benign and malignant lesions (P<0.05).
     良恶性病变的动态强化参数、SI Time曲线类型及MVD均有显著差异 (P <0 .0 5 )。
短句来源
     Objective To investigate the dynamic enhancement regulations of liver and their mechanism in Budd-Chiari syndrome(BCS) by using multi-slice CT and evaluate the value of CT angiography in the diagnosis of BCS.
     目的探讨BuddChiari综合征(BCS)肝脏多层CT动态强化规律及形成机制,分析CT血管成像(CTA)在BCS诊断中的应用价值。
短句来源
     In9cases of inflammatory pseudotumors,6cases were round and specula and the number of convergence sign of pulmonary vessels was3.In7cases of inflammatory pseudotumors examined with enhanced scanning,the number of dynamic enhancement of benign pulmonary nodules was6.In3cases of hamartomas,2cases showed central fat-densities.
     9例炎性假瘤均发生在两肺上叶前段或下叶基底段 ,6例结节呈圆形或类圆形 ,边缘可见长毛刺和胸膜凹陷征 ,3例周边可见斑片影及血管集束征 ,7例增强扫描6例呈良性肺结节的动态强化。 3例错构瘤2例检出结节边缘砂粒样钙化和中央脂肪密度。
短句来源
     Multi-slice CT dynamic enhancement scan in diagnosis of primary stomach lymphoma
     多层螺旋CT动态强化扫描诊断原发性胃恶性淋巴瘤
短句来源
     Compared with the results of DSA, we analyzed the dynamic enhancement regulations of liver in BCS, estimated the value of dynamic enhancement CT exams and CTA techniques in judging the obstruction level and showing collateral vessels.
     分析BCS患者的肝脏多层CT动态强化规律,并以DSA结果为对照,评价多层CT动态增强扫描及CTA技术在判断血管梗阻平面及显示肝内、外侧支循环中的价值。
短句来源
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  dynamic contract-enhanced
     Objective To study the manifestations of perfusion change in small heptic cell cancer(SHCC) on dynamic contract-enhanced MRI.
     目的分析原发性小肝细胞癌<3cm(SHCC)动态强化MR肿瘤灌注表现。
短句来源
     Conclusion Dynamic contract-enhanced MRI is important on study and diagnosis of SHCC.
     结论动态强化MR在研究及诊断SHCC中有重要作用。
短句来源
     Dynamic Contract-Enhanced MRI Study of Perfusion Change in SHCC
     MR动态强化在小肝癌的灌注表现
短句来源
  dynamic intensified
     Study on mechanism of treatment dyestuff wastewater by the dynamic intensified micro-electrolysis device
     动态强化微电解法处理染料废水及其机理的研究
短句来源
     After treatment of dyestuff wastewater by the dynamic intensified micro electrolysis device, the decolorization efficiency and the COD removal in wastewater were 95%~98% and 80%~85%, respectively.
     模拟染料废水经动态强化微电解装置处理 ,其色度下降 95 %~ 98% ,COD降低 80 %~ 85 %。
短句来源
  dynamic strengthening
     ON DYNAMIC STRENGTHENING MECHANISM OF METALLIC MATERIAL
     金属材料动态强化机制的探讨
短句来源
     The relationship between impact velocity and yield strength was obtained. The mechanism of dynamic strengthening was defined preliminarily.
     得到冲击速度与屈服强度的关系 ,并初步明确了动态强化的机制。
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      dynamic enhancement
    The dynamic enhancement of diffuse scattering is detected experimentally in regions corresponding to the excitation of waveguide modes for both the incident and scattered waves.
          
    Analysis of dynamic enhancement of natural convection cooling by a discrete vibrating plate
          
    Dynamic enhancement MRI of anterior lobe in pituitary dwarfism
          
    Readers evaluated by consensus the baseline echogenicity and the dynamic enhancement pattern of each lesion, in comparison with adjacent liver parenchyma.
          
    Baseline echogenicity and the dynamic enhancement pattern of each nodule, in comparison with adjacent thyroid parenchyma, were assessed.
          
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      dynamic strengthening
    Noticeable dynamic strengthening of samples with angles of orientation of fibers α=0 and 5° was observed.
          
    Nonoperative treatment and rehabilitation is based on the principal of dynamic strengthening of the shoulder muscular.
          


    The dynamic stress-strain relation of TC-4 titanium has been investigated experimentally under high strsin-rate by SHTB. It is showed that TC-4 is very sensitive to the strain-rate, and the sensitivity to the strain-rate increases with the rise of strain-rate. Although the dynamic hardening module decreases with the increase of strain-rate, the dynamic constitutive relation of TC-4 for a definite value of strain- rate can be illustrated in the linear hardening form. The experimental results arein good agreement...

    The dynamic stress-strain relation of TC-4 titanium has been investigated experimentally under high strsin-rate by SHTB. It is showed that TC-4 is very sensitive to the strain-rate, and the sensitivity to the strain-rate increases with the rise of strain-rate. Although the dynamic hardening module decreases with the increase of strain-rate, the dynamic constitutive relation of TC-4 for a definite value of strain- rate can be illustrated in the linear hardening form. The experimental results arein good agreement with the Malverns over stress model γp={exe[(1/a)(τ-f(γ))]-l}/bBut this model can not be used to present the phenomenon which the dynamic hardening module decreases with the increase of strain-rate. This character is one of the important factors for the formation of adiabatic shear band.

    利用分离式Hopkinson扭杆对钛合金TC-4进行了高应变率下动态剪切本构关系的实验研究。结果表明TC-4对应变率高度敏感,对应变率的敏感性随应变率的提高而增加。其动态应力应变关系呈线性强化形式。但动态强化模量随应变率的提高而略有减少。采用Malvern给出的过应力模式γ_p={exp[(1/α)(τ-f(γ))]-1}/b可以较好地描述TC-4的动态剪切本构关系。

    Objective To study the pathologic basis of the dynamic Gd DTPA enhanced MRI signs of hepatocellular carcinoma (HCC).Materials and Methods Dynamic Gd DTPA enhanced MRI signs and pathological findings in 35 patients with pathologically proved HCC were analyzed and compared. The imaging observation was focused on the lesion's signal intensity in arterial phase (AP) and portal venous phase (PP), and the enhancement degree of the lesion in AP. Pathologically, degree of cell differentiation and the structural...

    Objective To study the pathologic basis of the dynamic Gd DTPA enhanced MRI signs of hepatocellular carcinoma (HCC).Materials and Methods Dynamic Gd DTPA enhanced MRI signs and pathological findings in 35 patients with pathologically proved HCC were analyzed and compared. The imaging observation was focused on the lesion's signal intensity in arterial phase (AP) and portal venous phase (PP), and the enhancement degree of the lesion in AP. Pathologically, degree of cell differentiation and the structural pattern of the tumor were identified.Results According to signal intensity in AP and PP, the dynamic enhancement pattern was classified into three types. Type Ⅰ: hyper or iso intensity in AP and hypo intensity in PP. Type Ⅱ: hyper or iso intensity in both AP and PP. Type Ⅲ: hypo intensity in both AP and PP. Of 35 HCCs, type Ⅰ was seen in 19, type Ⅱ in 12 and type Ⅲ in 4. The ratio of poor differentiation HCC in type Ⅰ group was significantly higher than that in type Ⅱ and Ⅲ groups (P<0.007), while the ratio of well differentiated HCC in type Ⅱ was statistically higher than that in other two groups (P<0.011). The enhancement pattern of most compact and sclerosing HCCs was of type Ⅰ, while type Ⅰ and Ⅱ enhancement pattern was common in trabecular and pseudoglandular HCCs. Markedly enhanced HCCs in AP were usually poorly differentiated.Conclusion The dynamic enhancement type of HCCs during AP and PP can reflect the degree of tumor cell differentiation as well as the tumor's blood supply in a certain degree, non invasively providing imaging information for surgical and interventional management of HCC and for the judgement of prognosis.

    目的 探讨肝细胞癌 (hepatocellularcarcinoma ,HCC)动态增强表现的病理基础。资料与方法 分析 35例经手术病理证实的HCC动态增强MRI征象及病理表现。图像分析包括HCC动脉期、门脉期双期强化表现 ,动脉期强化程度。病理分析包括癌细胞分化程度、癌组织结构类型。结果 根据动脉期、门脉期信号强度及其演变分为Ⅰ、Ⅱ、Ⅲ型动态强化类型。Ⅰ型为动脉期强化高于或等于肝实质 ,门脉期低于肝实质 ;Ⅱ型为动脉期、门脉期强化均高于或等于肝实质 ;Ⅲ型为动脉期、门脉期强化均低于肝实质。 35例中Ⅰ型强化 1 9例 ,Ⅱ型 1 2例 ,Ⅲ型 4例。Ⅰ型强化中分化差的HCC比率显著高于其他类型 (精确检验 ,P =0 .0 0 7) ,Ⅱ型强化中分化好的HCC比率显著高于其他类型 (精确检验 ,P =0 .0 1 1 )。实体型与硬化型主要表现Ⅰ型强化 ,梁索型及假腺管型Ⅰ型和Ⅱ型强化均较多见。动脉期不同强化程度HCC其癌细胞分化无显著性差异 ,但明显强化的HCC以分化差多见。结论 MR动态增强类型可反映HCC的分化程度 ,并在一定程度上可反映出HCC的血供 ,可为HCC外科手术和介入治疗提供...

    目的 探讨肝细胞癌 (hepatocellularcarcinoma ,HCC)动态增强表现的病理基础。资料与方法 分析 35例经手术病理证实的HCC动态增强MRI征象及病理表现。图像分析包括HCC动脉期、门脉期双期强化表现 ,动脉期强化程度。病理分析包括癌细胞分化程度、癌组织结构类型。结果 根据动脉期、门脉期信号强度及其演变分为Ⅰ、Ⅱ、Ⅲ型动态强化类型。Ⅰ型为动脉期强化高于或等于肝实质 ,门脉期低于肝实质 ;Ⅱ型为动脉期、门脉期强化均高于或等于肝实质 ;Ⅲ型为动脉期、门脉期强化均低于肝实质。 35例中Ⅰ型强化 1 9例 ,Ⅱ型 1 2例 ,Ⅲ型 4例。Ⅰ型强化中分化差的HCC比率显著高于其他类型 (精确检验 ,P =0 .0 0 7) ,Ⅱ型强化中分化好的HCC比率显著高于其他类型 (精确检验 ,P =0 .0 1 1 )。实体型与硬化型主要表现Ⅰ型强化 ,梁索型及假腺管型Ⅰ型和Ⅱ型强化均较多见。动脉期不同强化程度HCC其癌细胞分化无显著性差异 ,但明显强化的HCC以分化差多见。结论 MR动态增强类型可反映HCC的分化程度 ,并在一定程度上可反映出HCC的血供 ,可为HCC外科手术和介入治疗提供无创的影像学依据 ,并有助于判断预后

    Objective To study MRI features of acute myocardial ischemia and reperfusion and its pathologic basis.Materials and Methods After ligation of the left anterior descending branch of the coronary artery for 40 minutes and subsequent reperfusion for 1 hour, the experimental rabbits (n=7) underwent pre contrast MRI, Gd DTPA enhanced dynamic MRI, cine MRI and dobutamine stress test. Myocardial blood flow was measured with radioactive microspheres ( 99m Tc MAA). Ischemic and infracted regions were defined...

    Objective To study MRI features of acute myocardial ischemia and reperfusion and its pathologic basis.Materials and Methods After ligation of the left anterior descending branch of the coronary artery for 40 minutes and subsequent reperfusion for 1 hour, the experimental rabbits (n=7) underwent pre contrast MRI, Gd DTPA enhanced dynamic MRI, cine MRI and dobutamine stress test. Myocardial blood flow was measured with radioactive microspheres ( 99m Tc MAA). Ischemic and infracted regions were defined as Even's blue and 2, 3, 5 triphenyltetrazolium (TTC) negative regions, respectively. Water content of the myocardium was estimated. Histopathologic examination and stereology analysis of myocardial specimen were made. Results The volume and numerical density of the cardiac myocytes, total number and average width of microvessels in ischemic and infracted regions were significantly lower, while water content was markedly higher, than that in normal regions. Besides, the dynamic contrast enhancement time intensity curves of diseased regions were different from the curves of normal regions. The wall movement, wall thickness and cardiac ejection fraction at rest were markedly decreased on cine MRI, but increased significantly after dobutamine stress.Conclusion After acute myocardial ischemia and reperfusion, different quantitative pathologic changes occur in normal, ischemic and infracted regions. A combination of Gd DTPA enhanced dynamic MRI, cine MRI and dobutamine stress test can significantly improve the accuracy and sensitivity in detecting acute myocardial ischemia and reperfusion injury, and is valuable in forecasting the myocardial viability.

    目的 研究心肌急性缺血再灌注损伤的MRI特征及其病理学基础。材料与方法 阻断家兔冠状动脉左前降支 40min再灌注 1h后行MR平扫、Gd DTPA动态增强、电影MRI(cine MRI)及多巴酚丁胺负荷试验。放射微球测定心肌血流 ,伊文氏蓝和TTC染色确定正常、危险和梗死心肌 ,行病理和体视学测量。结果 危险和梗死心肌含水量较正常显著升高 ,细胞体密度、数密度、总数以及微血管宽度和体密度较正常显著减少 ,动态强化时间 信号强度曲线与正常表现不同 ,静息cine MRI均显示损伤区运动减弱、室壁变薄 ,心脏射血分数减低 ,多巴酚丁胺负荷后则运动增强、室壁增厚 ,心脏射血分数增加。结论 急性缺血再灌注损伤后 ,不同的损伤区具有不同的定量病理学特征 ,Gd DTPA动态增强、cine MRI及多巴酚丁胺负荷试验可以提高对心肌急性缺血再灌注损伤检出的敏感性和准确性 ,预测心肌活性。

     
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