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噪比
    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)。
    Acquisition Time (TA), Signal to Noise Ratio (SNR), Contrast to Noise Ratio (CNR), integrity of vessel wall, blood flow artifact were measured and compared in each group with different parameters.
    分别测量和比较各组内不同扫描参数时序列的采集时间(TA)、图像信噪比(SNR)、对比噪声比(CNR)、靶血管壁完整性和血流伪影。
    The results showed: After Gd DTPA was injected, the signal to noise ratio(SNR) of pulmonary 2D and 3D TOF MRA was increased in 46 normal pulmonary MR angiography cases(P<0.01);
    结果显示 :Gd DTPA增强后的 2D和 3D TOFMRA信噪比明显高于未使用Gd DTPA的MRA信噪比 (P <0 .0 1 ) ;
    The signal to noise ratio (SNR), liver to spleen contrast to noise (L S CNR), lesion CNR and detection ratio of lesions were measured.
    比较图像的信噪比 (SNR)、肝脾对比噪声比 (L SCNR)、病灶对比噪声比(CNR)及病灶检出率。
    Methods:High and low frequency US images of 12 hemangiomas, 11 hepatomas and 9 liver metastases were obtained and changes in the contrast to noise ratio (CNR) of every tumor relative to the background were determined.
    方法 :分别以 2 .5 MHz和 5 .0 MHz两种频率扫查 12个血管瘤、 11个肝细胞癌和 9个肝转移癌 ,用直方图测出每个病灶的回声强度 ,并以此计算出每个病灶两种频率下的病变 -肝组织相对信噪比 ( CNR)及其 CNR变化值 (高频减低频 )。
    The signal to noise ratio (S/N) of the pancreas increased by 6%-113%(median 50%) and 18%-108% (median 65%) on T 1-weighted spin echo images and SPGR images, respectively.
    给药后胰腺信噪比于SET1WI及SPGRT1WI上分别上升 6 %~ 113% (中位数 5 0 % )和 18%~ 10 8% (中位数 6 5 % )。
    Methods Wrist joints in 20 normal volunteers were examined by T1WI,T2WI,T1W/SPIR,T2W/SPIR,and enhanced T1W/SPIR to measure and to compare the signal noise ratio(SNR)from each MR sequence. Then the statistic tests for the SNR data were performed.
    方法选20例正常腕关节,进行T1WI,T2WI,T1W/SPIR,T2W/SPIR,T1W/SPIR增强扫描,测量各序列信噪比强度进行比较,并进行统计学检验。
    Results The signal to noise ratio of white matter was 23.2 in SE EPI, which was higher than 17.8 in GE EPI.
    结果 SE EPI和GE EPI灌注图像脑白质的信噪比分别为 2 3 .2、17.8;
    Mean signal to noise ratio of artery was 20.58±3.74, and that of portal vein was 13.43±4.12. Five cases had anatomic mutation in hepatic arteries, including 1 cases of Michels typeⅡ, 2 cases of Michels typeⅢ, 1 case of Michels typeⅤand 1 case of Michels typeⅥ.
    动脉平均信噪比20.58±3.74,门静脉平均信噪比13.43±4.12;
    According to the order mentioned above, the signal to noise ratio were 1.68±0.21;
    按上述顺序,肺实质的信噪比为1.68±0.21;
    The image characteristic and quality were analyzed, the signal to noise ratio (SNR) of lung parenchyma in control group and that of lesions in patient group were calculated, and the contrast between the lesions and normal lung parenchyma were also calculated.
    正常组计算正常肺实质的信噪比,病变组计算病变的信噪比,正常肺实质与病变的对比度。
    ②The tri-phasic VIBE signal characteristics of the pancreatic masses including the signal to noise ratio(SNR) and contrast to noise ratio(CNR) of the lesion;
    ②肿块多期强化特征,计算病灶的信噪比(SNR)和对比噪声比(CNR);
    The changes of signal intensity between control and tag images in lung and aorta were evaluated, signal to noise ratio (SNR)of perfusion images was also evaluated with different TI values.
    评价不同TI值时,反转脉冲标记前后肺实质信号强度变化率、主动脉信号强度变化率和肺灌注(pulmonary blood flow,PBF)的信噪比(SNR)。
 

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