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表面弥散系数
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  apparent diffusion coefficient
     Apparent diffusion coefficient (ADC), the ratios of ADC and of signal intensity on T 2-weighted EPI and FSE T 2-weighted MR images in lesions to those in contralateral control areas were calculated.
     测量感兴趣区(ROI)及对侧相应解剖部位的表面弥散系数(ADC)值及T2W信号强度值,由此计算相对ADC(rADC)、T2WEPI和FSET2W相对信号强度比(rSIR)。
短句来源
     Maps of T2 and the Apparent Diffusion Coefficient (ADC) of water were acquired prior to cerebral HI, within last 5-10 min of HI and at 1 h or 24 h after HI.
     在缺氧前、缺氧最后5-10分钟、缺氧后1 h和24 h行头部MR扫描获得12和表面弥散系数(ADC)。
短句来源
     Application of Diffusion Weight Imaging and Apparent Diffusion Coefficient Mapping in the Diagnosis of Cerebral Infarction.
     磁共振弥散加权成像和表面弥散系数图在脑梗死诊断中的应用
短句来源
     Materials and Methods:DW EPI was performed in 28 healthy volunteers and 15 patients with cerebral infarction. Apparent diffusion coefficient (ADC) and relative ADC of normal tissues and cerebral infarcts were calculated.
     材料与方法:28例健康志愿者及15例脑梗塞患者均作DWEPI,分析其表现并计算正常人脑组织、脑梗塞区的表面弥散系数(ADC)及相对ADC(rADC)。
短句来源
     Objective To observe the changes in the apparent diffusion coefficient (ADC) of water in experimental cerebral infarction with diffusion weighted magnetic imaging.
     目的 用弥散磁共振成像观察实验性脑梗死灶水表面弥散系数 (apparentdiffusioncoefficient,ADC)值的变化。
短句来源
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  “表面弥散系数”译为未确定词的双语例句
     Objective To evaluate the value of diffusion weighted imaging(DWI) and apparent diffusion coefficients (ADC) in distinguishing benign and malignant breast lesions.
     目的 探讨弥散加权成像 (diffusionweightedimaging,DWI)的表面弥散系数 (apparentdiffusioncoefficients,ADC)鉴别乳腺良恶性病变的价值。
短句来源
     Objective:To study the roles of MRI DWI and ADC map in diagnosing various stages of cerebral infarction.
     目的:探讨磁共振弥散加权成像(diffusion weight imaging,DWI)和表面弥散系数图(apparent diffusion coefficient map-ping,ADCmap)对各期脑梗死的诊断作用。
短句来源
     10 cases of spinal cord contusion (edema-type) showed low signals on ADC map and 18 cases of cervical spondylosis showed high signals on ADC map.
     10例水肿型脊髓外伤表现表面弥散系数 (ADC)减低 ,ADC图低信号 ; 18例椎间盘突出ADC增高 ,ADC图高信号。
短句来源
     T2 values and apparent diffuse coeffcient (ADC) were acquired by MR imaging before HI, and 0, 1 and 24 hrs after HI. AQP4 expression in the brain and permeability of blood brain barrier were examined by immunohistological staining. Semiquantitive analysis of AQP4 protein was done by Western blotting.
     方法7日龄新生大鼠24只,在缺氧前,缺氧后0h,1h和24h行MR扫描获得T2加权成像和表面弥散系数(ADC),应用免疫组化染色观察脑内AQP4表达和血脑屏障通透性的改变,并用蛋白质印迹行AQP4半定量分析。
短句来源
  相似匹配句对
     DETERMINATION OF THE DISPERSIVE COEFFICIENT IN GROUNDWATER
     地下水弥散系数的测定
短句来源
     Purpose: To evaluate the diagnostic value of apparent diffusion coefficient(ADC) for hepatic masses.
     目的:探讨表面弥散系数(ADC)评估肝占位病变的价值。
短句来源
     STUDY OF DYNAMIC DIFFUSION COEFFICIENTS OF SOIL MOISTURE
     土壤水动力弥散系数研究
短句来源
     TEST ON HEAT TRANSFER COEFFICIENT OF BILLET'S SURFACE
     铸坯表面热交换系数的测定
短句来源
     Calculation of Local Collection Efficiencies for Aerofoil Surface
     机翼表面局部收集系数的计算
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  apparent diffusion coefficient
DWI was performed with two different b values (0, 1000 s/mm2) for calculation of apparent diffusion coefficient (ADC) maps.
      
Diffusion weighted imaging, apparent diffusion coefficient maps and stroke etiology
      
Evolution of the diffusion-weighted signal and the apparent diffusion coefficient in the late phase after minor stroke
      
In both twins, MRI demonstrated caudate nucleus atrophy and an increased apparent diffusion coefficient (ADC) in the striatum bilaterally with right sided predominance.
      
Apparent Diffusion Coefficient Recovery with Successful Basilar Artery Thrombolysis
      
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Objective: To evaluate the diffusion weighted echo planar imaging (DW EPI) features of brain in normal subjects and in patients with cerebral infarction.Materials and Methods:DW EPI was performed in 28 healthy volunteers and 15 patients with cerebral infarction. Apparent diffusion coefficient (ADC) and relative ADC of normal tissues and cerebral infarcts were calculated.Results:In normal subjects, the ADC values of cerebrospinal fluid, gray matter, and parietal, frontal, occipital white matter were 3.12,...

Objective: To evaluate the diffusion weighted echo planar imaging (DW EPI) features of brain in normal subjects and in patients with cerebral infarction.Materials and Methods:DW EPI was performed in 28 healthy volunteers and 15 patients with cerebral infarction. Apparent diffusion coefficient (ADC) and relative ADC of normal tissues and cerebral infarcts were calculated.Results:In normal subjects, the ADC values of cerebrospinal fluid, gray matter, and parietal, frontal, occipital white matter were 3.12, 0.89, 0.71, 0.80, and 0.84×10 -3 mm 2/s, respectively. Acute infarcts appeared as areas of hyperintensity on DW images, with a decreased ADC of 0.57~0.62×10 -3 mm 2/s. The lesions were more readily shown on DWI than on conventional T 2WI. Subacute and chronic infarcts presented hyperintensity or isointensity on DW images, with an average ADC of 0.71 and 1.27×10 -3 mm 2/s respectively. The areas of hyperintensity on DW images were not fully consistent with that on conventional T 2WI.Conclusion: DW EPI plays an important role in making early diagnosis and evaluation of cerebral infarction.

目的:探讨正常人脑及脑梗塞弥散加权平面回波成像(DWEPI)的特点。材料与方法:28例健康志愿者及15例脑梗塞患者均作DWEPI,分析其表现并计算正常人脑组织、脑梗塞区的表面弥散系数(ADC)及相对ADC(rADC)。结果:正常人脑脊液、灰质、顶、额、枕叶白质的ADC平均值分别为3.12、0.89、0.71、0.80、0.84×10-3mm2/s;急性期脑梗塞在DWI上表现为高信号,ADC值下降为0.57~0.62×10-3mm2/s,DWI对病变的显示明显优于常规T2WI;亚急性期和慢性期脑梗塞表现为高或等信号,平均ADC值分别为0.71、1.27×10-3mm2/s,DWI所示的高信号范围与常规T2WI不完全一致。结论:DWEPT对脑梗塞的早期诊断及评价起重要的作用。

Purpose: To evaluate the diagnostic value of apparent diffusion coefficient(ADC) for hepatic masses. Methods: Forty-eight patients with 58 liver masses have subjected to diffusion-weighted echo-planar imaging. Of fifty-dight liver masses, there were 30 hepatocellular carcinornas, 16 hemandoma and 12 hepatic cysts. Multi-diffusion weighted images with different b values(b=0, 30, 1000, 1100s/mm2) were integrated to ADC map, and also average ADCs values were obtained. Results:Average ADC values of hepatocelluar...

Purpose: To evaluate the diagnostic value of apparent diffusion coefficient(ADC) for hepatic masses. Methods: Forty-eight patients with 58 liver masses have subjected to diffusion-weighted echo-planar imaging. Of fifty-dight liver masses, there were 30 hepatocellular carcinornas, 16 hemandoma and 12 hepatic cysts. Multi-diffusion weighted images with different b values(b=0, 30, 1000, 1100s/mm2) were integrated to ADC map, and also average ADCs values were obtained. Results:Average ADC values of hepatocelluar carcinoma, hernangioma and hepatic cysts were 1.25±0.51×10-3. 1.75±0.6×10-3and 3.15±0.43×10-3 mm2/s. The difference between the avers ADC values was siedcant (P<0.01). Conclusion:Diffusion-weighted EPI is helpful to differentiate hepatocellular carcinoma, hemangioma and hepatic cyst, however, it is notpromising to detect or differentiate small liver lesions.

目的:探讨表面弥散系数(ADC)评估肝占位病变的价值。方法:48例带有58个肝占位病变患者进行了弥散加权平面回波成像。58个肝占位病变中30个肝细胞癌,16个肝血管瘤,12个肝囊肿。应用不同梯度因子b值(b=0,30,1000,1100秒/mm2)弥散图像拟合出ADC图,并获取ADC值。结果:肝细胞癌、肝血管瘤和肝囊肿的平均ADC值分别为:1.25±0.51×10-3、1.75±0.6×10-3和3.15±0.43×10-3mm2/秒,三者差异存在着显著性(P<0.01)。结论:弥散加权平面回波成像法对肝细胞癌、肝血管瘤和肝囊肿具有一定的鉴别价值,但不适宜对小病灶定性诊断。

Objective To evaluate the value of diffusion weighted imaging(DWI) and apparent diffusion coefficients (ADC) in distinguishing benign and malignant breast lesions. Methods Spin echo, Echo Planar diffusion imaging (TR 10 000 ms, TE 99 ms, thickness 5 mm)was used to scan 10 health volunteers and 49 patients with histologically proven benign (23) and malignant (26) breast lesions on a GE 1.5 T scanner using a GPFlex coil. Five b values (14 cases) or 2 b values (45 cases) were acquired with diffusion gradients...

Objective To evaluate the value of diffusion weighted imaging(DWI) and apparent diffusion coefficients (ADC) in distinguishing benign and malignant breast lesions. Methods Spin echo, Echo Planar diffusion imaging (TR 10 000 ms, TE 99 ms, thickness 5 mm)was used to scan 10 health volunteers and 49 patients with histologically proven benign (23) and malignant (26) breast lesions on a GE 1.5 T scanner using a GPFlex coil. Five b values (14 cases) or 2 b values (45 cases) were acquired with diffusion gradients applied in all 3 orthogonal directions. Geometric mean images were used in the analysis. Apparent diffusion coefficients (ADC) were calculated in all cases. One side upper limit of 95% permissible interval of ADC was adopted as the point to separate the malignant from benign lesions. The ability of ADC to discriminate benign and malignant breast lesions was compared with that of dynamic MRI. Results All benign and malignant lesions except 1 carcinomas in situ and 1 small adenoma were visible on DWI. Calculated ADC(in units of 10 -3 mm 2/s) of malignant lesions (0 960 8±0 204 3) was statistically different from that of benign lesions (1 585 8±0 323 4) and normal fibroglandular tissue (1 761 7±0 403 1). Mean ADC of 4 cystic lesions was 2 437 1. The sensitivity, specificity, and overall accuracy of diagnostic indices of ADC were 92 3%(24/26), 85 0%(17/20), and 89 1%(41/46), respectively. The ability of ADC in discriminating benign and malignant breast lesions was similar to that of dynamic MRI. Conclusion DWI is a rapid and feasible method in detecting breast lesions. ADC is an effective parameter in discriminating malignant and benign breast lesions.

目的 探讨弥散加权成像 (diffusionweightedimaging,DWI)的表面弥散系数 (apparentdiffusioncoefficients,ADC)鉴别乳腺良恶性病变的价值。方法 健康志愿者 10人 ,经手术病理证实的乳腺病变 49例 ,其中恶性肿瘤 2 6例 ,良性病变 2 3例。DWI采用单次激发回波平面成像 (echo planarimaging ,EPI)技术 ,14例取 5个b值 (b为扩散敏感度 ) ,余者取 2个b值 ,计算ADC值。以恶性肿瘤ADC值单侧上界 95 %容许区间为界限判断病灶的良恶性 ,诊断结果与动态增强比较。结果 除 1例原位癌和 1例小腺瘤外 ,DWI显示所有良恶性病变。恶性肿瘤组ADC值为 (0 96 0 8± 0 2 0 43)×10 -3 mm2 /s,明显低于良性病变组的 [(1 5 85 8± 0 32 3 4)× 10 -3 mm2 /s]及正常组的 [(1 76 17±0 40 3 1)× 10 -3 mm2 /s(P <0 0 5 ) ],良性病变组ADC值与正常组间无显著性差异。ADC诊断的敏感性为 92 3% ...

目的 探讨弥散加权成像 (diffusionweightedimaging,DWI)的表面弥散系数 (apparentdiffusioncoefficients,ADC)鉴别乳腺良恶性病变的价值。方法 健康志愿者 10人 ,经手术病理证实的乳腺病变 49例 ,其中恶性肿瘤 2 6例 ,良性病变 2 3例。DWI采用单次激发回波平面成像 (echo planarimaging ,EPI)技术 ,14例取 5个b值 (b为扩散敏感度 ) ,余者取 2个b值 ,计算ADC值。以恶性肿瘤ADC值单侧上界 95 %容许区间为界限判断病灶的良恶性 ,诊断结果与动态增强比较。结果 除 1例原位癌和 1例小腺瘤外 ,DWI显示所有良恶性病变。恶性肿瘤组ADC值为 (0 96 0 8± 0 2 0 43)×10 -3 mm2 /s,明显低于良性病变组的 [(1 5 85 8± 0 32 3 4)× 10 -3 mm2 /s]及正常组的 [(1 76 17±0 40 3 1)× 10 -3 mm2 /s(P <0 0 5 ) ],良性病变组ADC值与正常组间无显著性差异。ADC诊断的敏感性为 92 3% (2 4/ 2 6 ) ,特异性为 85 0 % (17/ 2 0 ) ,准确性为 89 1% (4 1/ 46 )。其诊断能力与动态增强扫描近似 ,二者对病变良、恶性诊断结果的一致性很好 (P <0 0 1)。结论 DWI能清楚地显示乳腺良恶性肿瘤 ,ADC值是鉴别乳腺良恶性病变的一个很有价值的参数。

 
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