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ultrasonic integrated backscatter
相关语句
  背向散射积分
    A Methodological Study on the Detection of Myocardial Ultrasonic Integrated Backscatter
    心肌背向散射积分检测的方法研究
短句来源
    The cyclic fluctuation of ultrasonic integrated backscatter(IB) of myocardium has been found to be a potential indicator of clinical significance in the diagnosis of myocardial ischemia.
    心肌超声背向散射积分(IB)在心动周期中起伏的幅度的大小直接反映心肌缺血的程度[1],有着重要的临床意义。
短句来源
  超声背向散射
    The cyclic fluctuation of ultrasonic integrated backscatter(IB) of myocardium has been found to be a potential indicator of clinical significance in the diagnosis of myocardial ischemia.
    心肌超声背向散射积分(IB)在心动周期中起伏的幅度的大小直接反映心肌缺血的程度[1],有着重要的临床意义。
短句来源
    AIM To explore the alternating pattern of myocardial ultrasonic integrated backscatter of SD rats before and after being exposed to electromagnetic pulse(EMP).
    目的探讨电磁脉冲照射前、后SD大鼠心肌组织超声背向散射参数变化特点。
短句来源
  超声背向散射积分
    The cyclic fluctuation of ultrasonic integrated backscatter(IB) of myocardium has been found to be a potential indicator of clinical significance in the diagnosis of myocardial ischemia.
    心肌超声背向散射积分(IB)在心动周期中起伏的幅度的大小直接反映心肌缺血的程度[1],有着重要的临床意义。
短句来源
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  ultrasonic integrated backscatter
Routine echocardiographic parameters and the cyclic variation of ultrasonic integrated backscatter of the ventricular septum (CV-IBS) were measured.
      
Influence of contractility on myocardial ultrasonic integrated backscatter and cyclic variation in integrated backscatter
      


The cyclic fluctuation of ultrasonic integrated backscatter(IB) of myocardium has been found to be a potential indicator of clinical significance in the diagnosis of myocardial ischemia. To investigate the feasibility of such a technique, a clinical IB testing system is established in our laboratory. Six male subjects with no history of heart diseases were tested by using this system. Based on the clinical data obtained during the tests, the effects of echo position, bandwidth, and different calculation...

The cyclic fluctuation of ultrasonic integrated backscatter(IB) of myocardium has been found to be a potential indicator of clinical significance in the diagnosis of myocardial ischemia. To investigate the feasibility of such a technique, a clinical IB testing system is established in our laboratory. Six male subjects with no history of heart diseases were tested by using this system. Based on the clinical data obtained during the tests, the effects of echo position, bandwidth, and different calculation algorithms on IB value were analyzed and compared. The results are available to provide a guideline for the design of instrumentation for IB detection.

心肌超声背向散射积分(IB)在心动周期中起伏的幅度的大小直接反映心肌缺血的程度[1],有着重要的临床意义。本文利用本实验室建立的一套IB检测的实验系统,以6名成年男性(无心脏病史)为受试者,对于检测中系统及算法的参数设置对正常心肌IB曲线的影响进行考察,发现回波段的选取及带宽的设定都对IB的检测结果产生显著的影响,而不同的计算方法也对IB的数值及计算时间有影响。该结果对将其推向临床具有指导意义

AIM To explore the alternating pattern of myocardial ultrasonic integrated backscatter of SD rats before and after being exposed to electromagnetic pulse(EMP).METHODS Forty SD rats were randomly divided into 2 groups and one group was exposed to EMP.Radio frequency images were acquired from short axis views of left ventricular at the time before and 24 hours after exposure to EMP.The radio frequency images of the normal group were acquired at the same time.Ten rats from each group were then killed and...

AIM To explore the alternating pattern of myocardial ultrasonic integrated backscatter of SD rats before and after being exposed to electromagnetic pulse(EMP).METHODS Forty SD rats were randomly divided into 2 groups and one group was exposed to EMP.Radio frequency images were acquired from short axis views of left ventricular at the time before and 24 hours after exposure to EMP.The radio frequency images of the normal group were acquired at the same time.Ten rats from each group were then killed and the tissue segments were excised and observed using transmission electron microscope.The values of ultrasonic integrated backscatter(IBS) were obtained with acoustic densitometry technique.RESULTS After exposure,the values of IBS% from either anterior wall or posterior wall decreased(P<0.05) and the values of IBS decreased by various degrees compared with those of normal control group or before exposure to EMP.Under transmission electron microscope,we saw intracellular edema and the alteration of cell organ.CONCLUSION The ultrasonic integrated backscatter values of the rats after exposure to EMP are significantly lower than those before exposure,suggesting some pathological alteration in rats' myocardial tissue after exposure to EMP.

目的探讨电磁脉冲照射前、后SD大鼠心肌组织超声背向散射参数变化特点。方法40只二级雄性SD大鼠,单盲法随机分为辐照组和对照组,辐照组给以相应参数的电磁脉冲(EMP)照射,对照组给以假照射。分别于照射前、照射后24 h采集大鼠胸骨旁左室短轴射频图像,并测量感兴趣区心肌背向散射积分(IBS)值、心腔内血池IBS值,计算出标准化心肌背向散射积分(IBS%),两时间点采集图像后每组各活杀10只大鼠,取心肌组织行透射电镜观察。结果EMP照射后大鼠心肌细胞水肿,细胞器改变。与对照组比较,辐照组照射24 h后左室前后壁IBS%均显著降低(P<0.01);后壁IBS值减低(P<0.05)。辐照组前、后壁IBS及IBS%均显著降低。结论SD大鼠EMP照射后心肌IBS%值较照射前降低,IBS值有不同程度改变,提示EMP照射后心肌组织的病理学改变。

AIM: To explore the non-invasive, quantitative ultrasonic diagnostic criteria of fatty liver diseases by establishing a rabbit model of hepatic steatosis and measuring ultrasonic integrated backscatter (IBS) and gray scale (GS). METHODS: Forty healthy New Zealand rabbits were randomly divided into normal control and three experimental groups. Hepatic steatosis was induced by high fat and sugar diet plus drinking water containing five percent of ethanol. Seven patients with mild or severe hepatic steatosis...

AIM: To explore the non-invasive, quantitative ultrasonic diagnostic criteria of fatty liver diseases by establishing a rabbit model of hepatic steatosis and measuring ultrasonic integrated backscatter (IBS) and gray scale (GS). METHODS: Forty healthy New Zealand rabbits were randomly divided into normal control and three experimental groups. Hepatic steatosis was induced by high fat and sugar diet plus drinking water containing five percent of ethanol. Seven patients with mild or severe hepatic steatosis were also recruited in the study. The steatosis, inflammation, and fibrosis of the rabbits' and patients' liver were evaluated by several histo-logical staining methods including Sudan IV, H&E, and Masson's Trichrome staining. Hepatic steatosis was graded as simple steatosis, steato-hepatitis, fibrosis and cirrhosis. Liver IBS including average image intensity (AII) and peak-peak intensity, and GS were measured using HP So-nos 5500 image system. The data were analyzed with one-way ANOVA. RESULTS: Hepatic AII was associated with the aggravated hepatic steatosis in near areas of the rabbit liver, i.e., normal control < mild fatty liver < moderate fatty liver < severe fatty liver (P < 0.0001). Significant differences were observed between AII of steatohepatitis and simple hepatic steatosis. In the patients, IBS was more accurate in the reflection the severity of the liver pathology than routine ultrasonic examination (85.7% vs 57.1%, P < 0.05), and significant differences of AII were observed between mild and severe hepatic steatosis (P < 0.0001, 0.001 or 0.05). The liver GS were markedly increased in the moderate and severe fatty liver as compared with that in normal control and mild fatty liver. Correlation analysis showed that GS and AII were consistently increased as the disease aggravated in the near area of the left and right liver lobes of the animals (r1 = 0.442 21, P1 = 0.0012; r2 = 0.335 73, P2= 0.0160). CONCLUSION: Rabbit fatty liver models can be developed in a short time by high fat and sugar diet plus alcohol. Hepatic IBS and GS intensity can reflect the grades of hepatic steatosis, inflammation and fibrosis, so they may serve as reliable non-invasive tools for the quantitative diagnosis of fatty liver disease.

目的:模拟人类不良饮食结构建立家兔不同程度脂肪肝模型,进行肝脏背向散射积分 (integrated backscatter,IBS)和图像灰阶平均强度(gray scale,GS)测定,并结合临床研究,探讨具有病理基础的脂肪肝无创性超声量化诊断标准.方法:选用纯种新西兰家兔40只,采用高脂高糖饲料及乙醇饮料建立不同程度脂肪肝模型三组(每组n=10),设立对照组(n=10):临床病例同步进行肝组织病理学及超声检测.病理组织学检测采用苏丹Ⅳ,HE和Masson三色染色:应用HP Sonos 5500超声诊断仪实时检测肝脏IBS,包括图像平均强度(average image intensity,AII)、峰-峰强度及图像强度标准差; 采用Photo shop 7.0直方图分析超声图像GS.所得数据采用SAS8.2进行统计学分析.结果:肝脏AII随脂肪变加重呈递增趋势,正常肝<轻度脂肪肝<中度脂肪肝<重度脂肪肝,尤以近区各组间差异显著(P<0.0001);同等程度肝脂肪变AII随炎症的发生而增大.临床研究显示,IBS对脂肪肝诊断率及与病理组织学符合率(85.7%)较常规超声检测(57.1%) 明显增高,重度脂肪肝AI...

目的:模拟人类不良饮食结构建立家兔不同程度脂肪肝模型,进行肝脏背向散射积分 (integrated backscatter,IBS)和图像灰阶平均强度(gray scale,GS)测定,并结合临床研究,探讨具有病理基础的脂肪肝无创性超声量化诊断标准.方法:选用纯种新西兰家兔40只,采用高脂高糖饲料及乙醇饮料建立不同程度脂肪肝模型三组(每组n=10),设立对照组(n=10):临床病例同步进行肝组织病理学及超声检测.病理组织学检测采用苏丹Ⅳ,HE和Masson三色染色:应用HP Sonos 5500超声诊断仪实时检测肝脏IBS,包括图像平均强度(average image intensity,AII)、峰-峰强度及图像强度标准差; 采用Photo shop 7.0直方图分析超声图像GS.所得数据采用SAS8.2进行统计学分析.结果:肝脏AII随脂肪变加重呈递增趋势,正常肝<轻度脂肪肝<中度脂肪肝<重度脂肪肝,尤以近区各组间差异显著(P<0.0001);同等程度肝脂肪变AII随炎症的发生而增大.临床研究显示,IBS对脂肪肝诊断率及与病理组织学符合率(85.7%)较常规超声检测(57.1%) 明显增高,重度脂肪肝AII显著高于轻度脂肪肝(P<0.0001,0.001或0.05).肝脏GS与AII相关,于肝左、右叶近区二者随病变加重呈一致性增高趋势(r1=0.442 21,P1=0.0012:r2= 0.335 73,P2=0.0160).中重度脂肪肝伴炎症 GS显著高于正常肝及轻度脂肪肝(P<0.05).结论:高营养及乙醇联合喂养家兔可快速建立不同程度脂肪性肝病模型;肝脏超声IBS及 GS强度可反映肝脂肪变、炎症和纤维化的病变程度,为脂肪肝无创性量化诊断提供可靠依据.

 
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