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contrast noise ratio
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  对比噪声比
     Methods:In 16 ECs,we measured the signal intensity(SI)and the value of ADC on T_1WI/T_2WI,FLAIR and DWI,calculated contrast ratio (CR) and contrast noise ratio (CNR).
     方法:ECs16例,测量其T1WI、T2WI、FLAIR及DWI上病灶信号强度和ADC值,计算组织间对比度(CR)和对比噪声比(CNR)。
短句来源
     Contrast noise ratio (CNR) between lesion and liver tissue for DWI and T2WI were measured.
     计算在DWI与T2WI上病灶与肝组织之间的对比噪声比 (CNR)并予以比较。
短句来源
     And for those 40 cooperative patients with cerebral infarction, the signal noise ratio (SNR) and contrast noise ratio (CNR) were compared.
     对配合检查的40例脑梗死患者对比图像的信噪比(SNR)和对比噪声比(CNR)。
短句来源
     Objective To evaluate MRI in qualitative and quantitative diagnosis of acute leukemia by observing the MRI findings of bone marrow, calculating T 1 and CNR (contrast noise ratio) before and after chemotherapy, and by comparing clinical and pathological data.
     目的 通过观察急性白血病治疗前后骨髓的MRI表现和T1及对比噪声比 (CNR)的测定 ,对照临床、病理资料 ,探讨急性白血病骨髓MRI定性和定量诊断价值。
短句来源
     Signal to noise ratio(SNR)of articular cartilage and contrast noise ratio (CNR)between cartilage and adjacent tissues were measured and compared on MR imaging of different parameters. The display of minimal defect model was evaluated on imaging of different parameters.
     测量和比较不同参数成像关节软骨的信噪比(SNR)、软骨与周围组织的对比噪声比(CNR)以及最小缺损模型的显示能力。
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  “contrast noise ratio”译为未确定词的双语例句
     Tap water in plastic bottle was used as control fluid. The flow fluid with different concentration contrast medium, flow velocity and tube diameter was scanned by 1.5T MR machine with 3DPC and 3DTOF MR angiography respectively. Then the contrast noise ratio (CNR) was calculated at five partitions(10mm, 20m, 30mm, 40mm. 50mm distance from the entry point).
     利用1.5TMR机根据设定的3DTOF、3DPC扫描参数对不同浓度对比剂、不同管径、蠕动泵控制下的不同流速的流体进行扫描,分别计算距流体进入层面10mm、20mm、30mm、40mm、50mm管内流体的CNR。
短句来源
     Methods True FISP T 2 weighted imaging were measured in 452 patients with a 1.5 T MRI scanner. Of which 68 cases with 163 proven hepatic lesions were evaluated for signal noise ratio (SNR), liver spleen contrast noise ratio (L S CNR), lesion detection, and definition of intrahepatic veins and artifacts.
     方法45 2例临床拟诊肝胆疾患病人行横断面、冠状面或 (和 )矢状面true FISPT2 WI,对其中临床证实的 6 8例 (16 3个病灶 )进行评价 ,包括肝脏局灶病变的检出率、对比信噪比、肝内静脉的显示、周围脏器的显示及伪影等 ,并与TSE(快速自旋回波 )T2 WI进行比较。
短句来源
     Characterization of a renal mass was done by the visual analysis of tumor vascularity as well as quantitative assessment of the contrast noise ratio(CNR)and degree of the enhancement.
     计算并比较不同序列肿瘤-肾实质对比-噪声比(CNR)。
短句来源
     CNR (contrast noise ratio) was regarded as evaluating mark. Results Tumor signal intensity of experimental group was increased evidently between 1-2 hours after injecting Gd-DTPA-Folate.
     结果注射对比剂后1h(q1)和2h(q2),实验组裸鼠瘤体信号强度升高明显,与注射对比剂前比较,差异有统计学意义(以计算值CNR为判断指标:q1=5.80,q2=4.64,P值均<0.05);
短句来源
     Methods Post-processing the coronary CTA data of 24 patients with heart failure and 24 patients without heart failure on vascular analysis techniques to visualize the CS, and the caliber and the area of CSO were measured. The quality of CS on CT imaging was graded using a 4-point scale. The contrast noise ratio (CNR) of CS was evaluated.
     方法将24例经CTA证实无心脏和冠状动脉疾病的患者和24例不同程度充血性心功能不全患者的冠状动脉CTA检查数据进行图像处理,主要评价CS的图像质量、长度、CSO的直径和横截面积、冠状窦瓣的显示率,并比较心功能正常患者和充血性心功能不全患者的CSO大小有无差异。
短句来源
  相似匹配句对
     The contrast value and the ratio of signal to noise were calculated.
     计算各热灶的对比度和信噪比。
短句来源
     NOISE
     噪音
短句来源
     Ratio (H.R.)
     Ratio .
短句来源
     In contrast to E.
     通过构建工程菌E .
短句来源
     Noise
     噪声的危害与控制
短句来源
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  contrast noise ratio
Theoretical limits for spatial resolution and contrast/noise ratio were calculated and compared with the empirical results from a Monte-Carlo study.
      


Objective To evaluate MRI in qualitative and quantitative diagnosis of acute leukemia by observing the MRI findings of bone marrow, calculating T 1 and CNR (contrast noise ratio) before and after chemotherapy, and by comparing clinical and pathological data.Materials and Methods MRI scanning, T 1 value and CNR measuring were performed in study group (38 acute patients), remission group (25 cases) and control group (35 healthy volunteers).Results Before treatment hypointense signal on...

Objective To evaluate MRI in qualitative and quantitative diagnosis of acute leukemia by observing the MRI findings of bone marrow, calculating T 1 and CNR (contrast noise ratio) before and after chemotherapy, and by comparing clinical and pathological data.Materials and Methods MRI scanning, T 1 value and CNR measuring were performed in study group (38 acute patients), remission group (25 cases) and control group (35 healthy volunteers).Results Before treatment hypointense signal on T 1WI at lumbosacral vertebrae, iliac bone and proximal femur was seen in all 38 cases with acute leukemia. Isointense signal on T 2WI was found in all cases. The signal intensity on T 1WI tended to become normal in all 25 remission cases of acute leukemia. Isointense signal was also found on T 2WI in remission cases. Significant differences in B% of blood and marrow, T 1 value of lumbar vertebrea, CNR of lumbar vertebrea/subcutaneous fat, and CNR of femoral marrow/subcutaneous fat were existed between study group before treatment and both control group and remission group (P<0.05). No significant difference could be seen between remission group and control group (P>0.05), nor between cases with different cellular type, including ALL, AML, ALL+AML (P>0.05). Positive linear correlation existed between B% of bone marrow and lumbar T 1 value, CNR of lumbar vertebrea/subcutaneous fat, between B% of peripheral blood and lumbar T 1 value, CNR of lumbar vertebrea/subcutaneous fat, and between lumbar T 1 value and CNR of lumbar vertebrea/subcutaneous fat (P<0.05).Conclusion Acute leukemia has some characteristics on MRI. As a non invasive technique, MRI is very useful in estimating the severity of the disease and in evaluating the therapeutic effect, refraining from repeated marrow puncturing.

目的 通过观察急性白血病治疗前后骨髓的MRI表现和T1及对比噪声比 (CNR)的测定 ,对照临床、病理资料 ,探讨急性白血病骨髓MRI定性和定量诊断价值。材料与方法 选择经临床确诊为急性白血病的患者 38例 ,缓解组 2 5例 ,对照组 35例进行MRI检查及T1值和CNR的测定。结果 急性白血病T1WI:治疗前组 38例 ,腰骶椎、髂骨及股骨近段均表现为信号降低 ;化疗缓解组 2 5例表现为不同程度的信号增高。T2 WI :38例治疗前组和 2 5例化疗后组各椎体、髂骨、股骨上段呈等信号。外周血B %、骨髓B %、腰椎T1值、腰椎 /皮下脂肪CNR、股骨骨髓 /皮下脂肪CNR于急性白血病治疗前组与正常对照组、治疗前组与缓解组间的差异均有显著性 (P <0 .0 5 ) ,缓解组与正常对照组间的差异无显著性 (P >0 .0 5 ) ,不同细胞类型间的差异无显著性 (P >0 .0 5 )。腰椎T1值于不同性别、年龄组间的差异无显著性 (P >0 .0 5 )。治疗前组骨髓B %与腰椎T1值、腰椎 /皮下脂肪CNR ,外周血B %与腰椎T1值、腰椎 /皮下脂肪CNR及腰椎T1值与腰椎 /皮下脂肪CNR之间成直...

目的 通过观察急性白血病治疗前后骨髓的MRI表现和T1及对比噪声比 (CNR)的测定 ,对照临床、病理资料 ,探讨急性白血病骨髓MRI定性和定量诊断价值。材料与方法 选择经临床确诊为急性白血病的患者 38例 ,缓解组 2 5例 ,对照组 35例进行MRI检查及T1值和CNR的测定。结果 急性白血病T1WI:治疗前组 38例 ,腰骶椎、髂骨及股骨近段均表现为信号降低 ;化疗缓解组 2 5例表现为不同程度的信号增高。T2 WI :38例治疗前组和 2 5例化疗后组各椎体、髂骨、股骨上段呈等信号。外周血B %、骨髓B %、腰椎T1值、腰椎 /皮下脂肪CNR、股骨骨髓 /皮下脂肪CNR于急性白血病治疗前组与正常对照组、治疗前组与缓解组间的差异均有显著性 (P <0 .0 5 ) ,缓解组与正常对照组间的差异无显著性 (P >0 .0 5 ) ,不同细胞类型间的差异无显著性 (P >0 .0 5 )。腰椎T1值于不同性别、年龄组间的差异无显著性 (P >0 .0 5 )。治疗前组骨髓B %与腰椎T1值、腰椎 /皮下脂肪CNR ,外周血B %与腰椎T1值、腰椎 /皮下脂肪CNR及腰椎T1值与腰椎 /皮下脂肪CNR之间成直线相关 (P <0 .0 5 )。结论 急性白血病的MRI检查为一种无创性检查方法 ,MRI表现具有一定的特征性 ,在估计病情的严重程度及治疗效果的评价简便实用 ,为避免多次重复骨髓穿刺检查以及全面

Objective To evaluate the application of true FISP T 2 weighted imaging in focal liver lesions. Methods True FISP T 2 weighted imaging were measured in 452 patients with a 1.5 T MRI scanner. Of which 68 cases with 163 proven hepatic lesions were evaluated for signal noise ratio (SNR), liver spleen contrast noise ratio (L S CNR), lesion detection, and definition of intrahepatic veins and artifacts. The results were compared with those from Turbo SE T 2 weighted imaging....

Objective To evaluate the application of true FISP T 2 weighted imaging in focal liver lesions. Methods True FISP T 2 weighted imaging were measured in 452 patients with a 1.5 T MRI scanner. Of which 68 cases with 163 proven hepatic lesions were evaluated for signal noise ratio (SNR), liver spleen contrast noise ratio (L S CNR), lesion detection, and definition of intrahepatic veins and artifacts. The results were compared with those from Turbo SE T 2 weighted imaging. Results True FISP and TSE showed similar ability in detecting cystic lesions. For detecting solid lesion, TSE was little better than true FISP ( P >0.05). True FISP T 2 *WI had fewer moving artifacts than TSE ( P <0.05). True FISP T 2 *WI showed intrahepatic veins much more clearly than TSE ( P <0.01). Conclusion While showing a lower L S CNR and detecting fewer solid lesions than TSE T 2WI, true FISP T 2 *WI has good SNR, little artifact and excellent demonstration of intrahepatic veins.

目的 评价true FISP(真实稳态进动快速成像 )T2 WI序列在肝脏病变中的应用。方法45 2例临床拟诊肝胆疾患病人行横断面、冠状面或 (和 )矢状面true FISPT2 WI,对其中临床证实的 6 8例 (16 3个病灶 )进行评价 ,包括肝脏局灶病变的检出率、对比信噪比、肝内静脉的显示、周围脏器的显示及伪影等 ,并与TSE(快速自旋回波 )T2 WI进行比较。结果 对肝海绵状血管瘤和肝囊肿的检出率 ,true FISP与TSE相近 ;true FISP对肝脏恶性结节的检出率略低于TSE(P >0 0 5 ) ;true FISP的病灶对比信噪比低于TSE(P <0 0 5 ) ;对肝内静脉的显示 ,true FISP明显优于TSE(P <0 0 1) ;对解剖结构的显示 ,true FISP优于TSE(P <0 0 1)。结论 true FISPT2 WI用于肝胆病变的优点 :(1)有较高的空间分辨率和信噪比 ;(2 )肝内静脉显示清晰 ;(3)解剖结构的显示优于常规TSE序列。缺点 :(1)T2 对比较差 ,易遗漏肝脏实性结节 ;(2 )近膈面及胆囊区易出现磁敏感伪影 ,可能造成误...

目的 评价true FISP(真实稳态进动快速成像 )T2 WI序列在肝脏病变中的应用。方法45 2例临床拟诊肝胆疾患病人行横断面、冠状面或 (和 )矢状面true FISPT2 WI,对其中临床证实的 6 8例 (16 3个病灶 )进行评价 ,包括肝脏局灶病变的检出率、对比信噪比、肝内静脉的显示、周围脏器的显示及伪影等 ,并与TSE(快速自旋回波 )T2 WI进行比较。结果 对肝海绵状血管瘤和肝囊肿的检出率 ,true FISP与TSE相近 ;true FISP对肝脏恶性结节的检出率略低于TSE(P >0 0 5 ) ;true FISP的病灶对比信噪比低于TSE(P <0 0 5 ) ;对肝内静脉的显示 ,true FISP明显优于TSE(P <0 0 1) ;对解剖结构的显示 ,true FISP优于TSE(P <0 0 1)。结论 true FISPT2 WI用于肝胆病变的优点 :(1)有较高的空间分辨率和信噪比 ;(2 )肝内静脉显示清晰 ;(3)解剖结构的显示优于常规TSE序列。缺点 :(1)T2 对比较差 ,易遗漏肝脏实性结节 ;(2 )近膈面及胆囊区易出现磁敏感伪影 ,可能造成误诊或漏诊

Objective To make a curve of dose grads liver signal of superparamagnetic iron oxide (SPIO) in normal rats, to compare lesion to liver contrast noise ratio (C/N) and to assess the ability on MR imaging before and after SPIO injection. Methods Group one: 72 normal SD rats divided into 18 specimen groups at random, underwent MR enhancement with 0,2,5……280 μmol Fe/kg SPIO respectively after plain scanning. The signal to noise ratio of liver was measured and a curve of dose grads liver signal...

Objective To make a curve of dose grads liver signal of superparamagnetic iron oxide (SPIO) in normal rats, to compare lesion to liver contrast noise ratio (C/N) and to assess the ability on MR imaging before and after SPIO injection. Methods Group one: 72 normal SD rats divided into 18 specimen groups at random, underwent MR enhancement with 0,2,5……280 μmol Fe/kg SPIO respectively after plain scanning. The signal to noise ratio of liver was measured and a curve of dose grads liver signal was made in order to find an appropriate dose for enhancement. Group two: 38 rats with 43 implanted liver adenocarcinomas underwent T 1 and T 2 weighted MR imaging before and after the injection of SPIO agent. Evaluations included enhancing characteristics of the tumors, counting the number of lesions and statistical analysis of quantitative changes in the signal intensity of both lesions and normal liver. Results On SPIO enhanced T 2 weighted and T 1 weighted MR images, the signal intensity of liver was reduced to peripheral noise on the dose of 10 μmol Fe/kg and 40 μmol Fe/kg respectively. The highest contrast to noise ratio (C/N) could be acquired on the dose of 20 μmol Fe/kg on enhanced T 2 weighted MR images; its C/N almost doubled compared with that of enhanced T 1 weighted and unenhanced T 2 weighted MR images. The C/N of unenhanced T 1 weighted MR images was lowest. The number of lesions detected on enhanced MR imaging was the same as that of the pathology, and enhanced MR imaging was superior to unenhanced MR imaging in tumors smaller than 3 mm, of 36.3% escaped detection on unenhanced MR images. Conclusion Good enhancement effect of SPIO on T 1 and T 2 weighted MR imaging could be acquired at the dose of 20 μmol Fe/kg, its detecting ability approached that of gross pathology, and the best contrast to noise ratio was found on T 2 weighted enhanced MR image.

目的 研究正常大鼠的超顺磁性氧化铁 (SPIO)剂量梯度 肝脏信号曲线、大鼠种植型肝癌SPIO增强前后的对比噪声比和检出率。方法 第 1组 :72只正常SD大鼠随机分成 18个样本组 ,平扫后以 0、2、5…… 2 80 μmolFe/kg 18个SPIO剂量分别做增强扫描 ,做剂量梯度 肝脏信号曲线。第 2组 :38只种植型肝癌模型鼠 ,共计生成 43个肿瘤 ,行平扫及SPIO增强扫描 ,分析肿瘤磁共振强化特点 ;测量增强前后T1及T2 WI上的肿瘤 /肝脏对比噪声比 ,与病理对照统计平扫与增强的检出率。结果 在SPIO增强T2 及T1WI上 ,正常肝组织信号降至周围噪声水平的剂量分别为 10 μmolFe/kg及 40μmolFe/kg。以 2 0 μmolFe/kg剂量 ,增强T2 WI的肿瘤 /肝脏对比噪声比最好 ,几乎是增强T1WI及平扫T2 WI的 2倍 ,平扫T1WI的对比噪声比最差。SPIO增强MRI病灶检出率高达 10 0 %。在肿瘤小于 3mm组 ,平扫与增强检出率相差显著 ,其平扫漏检率达 36 .3%。结论  2 0 μmolFe/kg的SPIO剂量能同时获得良好的T2 、T1增强效...

目的 研究正常大鼠的超顺磁性氧化铁 (SPIO)剂量梯度 肝脏信号曲线、大鼠种植型肝癌SPIO增强前后的对比噪声比和检出率。方法 第 1组 :72只正常SD大鼠随机分成 18个样本组 ,平扫后以 0、2、5…… 2 80 μmolFe/kg 18个SPIO剂量分别做增强扫描 ,做剂量梯度 肝脏信号曲线。第 2组 :38只种植型肝癌模型鼠 ,共计生成 43个肿瘤 ,行平扫及SPIO增强扫描 ,分析肿瘤磁共振强化特点 ;测量增强前后T1及T2 WI上的肿瘤 /肝脏对比噪声比 ,与病理对照统计平扫与增强的检出率。结果 在SPIO增强T2 及T1WI上 ,正常肝组织信号降至周围噪声水平的剂量分别为 10 μmolFe/kg及 40μmolFe/kg。以 2 0 μmolFe/kg剂量 ,增强T2 WI的肿瘤 /肝脏对比噪声比最好 ,几乎是增强T1WI及平扫T2 WI的 2倍 ,平扫T1WI的对比噪声比最差。SPIO增强MRI病灶检出率高达 10 0 %。在肿瘤小于 3mm组 ,平扫与增强检出率相差显著 ,其平扫漏检率达 36 .3%。结论  2 0 μmolFe/kg的SPIO剂量能同时获得良好的T2 、T1增强效果 ,其中T2 WI上肿瘤与肝脏对比最佳 ,检出率达到大体病理水平

 
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