表观扩散系数

PC机辅助MR人脑表观扩散系数图的成像研究

PC - assisted Human Brain ADC Mapping

目的：评价多体素氢质子磁共振波谱（1HMRS）和表观扩散系数（ApparentDiffusionCoefficient，ADC）两种新技术在脑星形细胞瘤分级及鉴别诊断中的价值和意义。

Objective : To evaluate multi-voxel proton magnetic resonance spectroscopy ( 1HMRS ) and apparent diffusion coefficient ( ADC ) in cerebral astrocytomas grading and differentiation .

~（237）Np在膨润土中表观扩散系数的测定

Determination of diffusion coefficients of ~ ( 237 ) np in bentonite

二组患者病变椎体的表观扩散系数（ADC）值也做了对比。

Apparent diffusion coefficient ( ADC ) between benign and malignant vertebral fractures was also measured .

目的探讨脑星形细胞瘤瘤周水肿表观扩散系数（ADC）值与基质金属蛋白酶（MMP-9）表达的关系。

Objective To discuss the correlation between MMP-9 expression levels and ADC values in peritumoral edema of cerebral astrocytoma .

毛细管法测定~（152154）Eu（Ⅲ）在压实皂土中的表观扩散系数和吸附分配系数

Effect of pH on the Apparent Diffusion Coefficient and Sorption Distribution Coefficient of ~ ( 152,154 ) Eu (ⅲ) in Compacted Bentonite : A Study of Capillary Method

用毛细管法研究了pH值对152154Eu（Ⅲ）在压实皂土中的吸附分配系数和表观扩散系数的影响。

Effect of pH on the sorption distribution coefficient ( K_d ) and apparent diffusion coefficient ( D_a ) of ~ ( 152,154 ) Eu (ⅲ) in the compacted bentonite is studied with the capillary method .

目的探讨3.0TMR扩散加权成像（DWI）及相应的表观扩散系数（ADC）对胰腺癌的诊断价值。

Objective To determine the potential ability of diffusion-weighted imaging ( DWI ) and corresponding apparent diffusion coefficient ( ADC ) in the diagnosis of pancreatic cancer at 3.0T MR.

脑缺血时水分子扩散运动受限，DWI上表现为高信号，表观扩散系数（ApparentDiffusionCoefficient，ADC）图上则呈低信号。

When cerebral ischemia occurs , the water diffusion in focal ischemic tissue is limited . Hence there will be high signal intensity on DWI and low signal intensity on apparent diffusion coefficient ( ADC ) map .

计算病灶侧与对侧的表观扩散系数（ADC）、各向异性分数（FA）、各向异性指数（AI），进行配对t检验。

ADC ( apparent diffusion coefficient ), FA ( fractional anisotropy ) and AI ( anisotropy index ) of the lesions and the contralateral side were calculated and compared with paired t test .

目的：探讨兔大脑中动脉阻塞（MCAO）后早期脑内肌酸含量的动态演变规律及其与磁共振扩散加权成像（DWI）上表观扩散系数（ADC）值之间的关系。

Objective : To observe the Cr evolution of early cerebral infarction in rabbit model of the middle cerebral artery occlusion ( MCAO ), and compared with ADC value in DWI .

目的评价MR扩散张量（DTI）中各向同性成像、表观扩散系数（ADC）图像、部分各向异性（FA）图像、各向异性体积比（VR）图像在诊断亚急性脑梗塞中的作用。

Objective To evaluate diffusion tensor imaging ( DTI ), including isotropic imaging , apparent diffusion coefficient ( ADC ), fractional anisotropy ( FA ) and volume ratio ( VR ), in the diagnosis of subacute stroke .

方法用平面回波成像（EPI）技术对63例健康正常人的腹部实质器官（肝、脾、肾及胰腺）分别行磁共振扩散加权成像（DWI）并测量各自的表观扩散系数（ADC）。

Methods DWI was performed using echo-planar imaging ( EPI ) sequences in 63 normal human abdominal organs ( including liver , spleen , kidney and pancreas ) and water phantoms , then their apparent diffusion coffecients ( ADC ) were calculated .

目的探讨良性前列腺增生（BPH）和前列腺癌（PCa）的扩散加权成像（DWI）和表观扩散系数（ADC）图表现，及对PCa的鉴别诊断价值。

Objective To describe diffusion weighted imaging ( DWI ) and apparent diffusion coefficient ( ADC ) map appearance of benign hyperplasia ( BPH ) and prostate cancer ( PCa ) , and to evaluate DWI and ADC map and ADC values in differential diagnosis of PCa .

目的定量研究不同年龄段正常脑白质磁共振扩散加权成像平均表观扩散系数（ADCav）值，分析年龄因素对正常脑白质ADCav值的影响。

Objective To quantitatively study the effect of ages on the average apparent diffusion coefficient ( ADCav ) of normal-appearing white matter .

对KojiTerada的实验数据进行分析：表观扩散系数与温度、喷丝孔径和凝固浴浓度有关，对丝条半径的变化具有的两种效应即比表面积和溶剂推动力变化进行分析。

The analysis of the experimental results from Koji Terada showed that the apparent diffusion coefficients were influenced by the temperature , spinneret radius and coagulant concentration . The radius variation of fiber could have two effects , which were the variations of the diffusion surface and the diffusion gradient .

脑星形细胞瘤表观扩散系数的应用价值

Apparent Diffusion Coefficients in the Evaluation of the Cerebral Astrocytomas

急性脑缺血表观扩散系数成像的实验研究

An experimental study on acute cerebral ischemia and reperfusion with diffusion-weighted imaging

全身扩散加权成像；表观扩散系数；乳腺癌；骨转移；

Whole body diffusion weighted imaging Apparent diffusion coefficient Breast cancer Bone metastasis ;

定量研究表观扩散系数与T2值在肝局灶性小病变中的应用价值

Quantitative Study of ADCs and T_2 Value in the Diagnosis of Small Focal Hepatic Lesions

表观扩散系数在肝癌动脉化疗栓塞后早期监测中的价值

Value of apparent diffusion coefficient in monitoring tumor response to TACE of hepatic carcinoma in rabbits

慢应变速率拉伸条件下氢渗透表观扩散系数的测定

The measurement of apparent diffusivity d by hydrogen permeation under slow strain rate tensile test condition

磁共振弥散加权成像及表观扩散系数在脑转移瘤诊断中的价值弥散神经内分泌系统

Value of diffusion-weighted imaging and apparent diffusion coefficient in diagnosis of brain metastases tumor diffuse neuroendocrine system

但是活泼质子的表观扩散系数却显著地受化学交换的影响.当以活泼质子为对象时，这种影响需要引起足够的重视。

However , the apparent self diffusion coefficients of the labile protons are obviously affected by chemical exchange .

超急及急性脑卒中患者三向同性扩散加权像和表观扩散系数的应用

Application of isotropic diffusion weighted imaging and apparent diffusion coefficient in patients with stroke in hyperacute and acute stages

利用电化学氘渗透方法，测定了室温附近氘在钯晶体中的表观扩散系数和晶格扩散系数。

The electro-chemical permeation method was used to measure the apparent and Lattice diffusivity of the deuterium in Pd crystals around room temperature .

超急性、急性期病灶中心相对表观扩散系数最低，从中心往外逐渐升高呈梯度征。

The rADC in hyperacute and acute stage of focus center was minimized , and increased progressively from center to periphery with gradient sign .

用动界面张力方法研究原油/盐水界面的性质Ⅱ.起始界面吸附速率和表观扩散系数的测定

STUDIES ON THE PROPERTIES OF CRUDE OIL / BRINE INTERFACE BY USING DYNAMIC INTERFACIAL TENSION MEASUREMENT ⅱ . The Determination of Initial Adsorption Rate and Apparent Diffusion Coefficient

用计时电流法及伏安法研究了抗坏血酸在此修饰电极上的电化学行为，计算出抗坏血酸在修饰电极膜内的表观扩散系数为1.88×10-7cm2/s；

The electrochemical behaviour of ascorbic acid ( AA ) at this modified electrodes was studied by chronoamperometric and voltammetry . Its diffusion coefficient was 1.88 × 10-7cm2 / s.

测量胼胝体膝部、胼胝体压部和海马的表观扩散系数和各向异性分数。

The appearance diffusion coefficient and the fractional anisotropy were measured for the splenium of the corpus callosum , the genu of the corpus callosum , and the hippocampus .