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噪声比
    HARMONICS TO NOISE RATIO ANALYSIS OF PATHOLOGICAL SPEECH SIGNALS
    病变语音信号的谐波噪声比分析
    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。
    Achievement of a signal to noise ratio adequate for precise registration is accomplished using digital signal enhancement techniques.
    用数字信号增强技术可以得到足以精确定位的信号噪声比
    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。
    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.
    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。
    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 FLASH-T 1WI sequence was performed in 59 patients with 279 lesions. The signal-to-noise ratio(SNR),spondyle-muscle contrast to noise ratio(S-MCNR),lesion CNR,and detection ratio of lesions were measured. The results were compared with those from SE-T 1WI,TSE-T 2WI.
    方法  5 9例病人 (2 79个病灶 )接受脊柱FLASH-T1 WI序列磁共振扫描 ,评价其图像信噪比 (SNR) ,脊椎—肌肉对比噪声比 (S -MCNR) ,病灶对比噪声比 (CNR)及病变检出率 ,并与SE -T1 WI ,TSE -T2 WI作比较。
    The fast fourier transformation(FFT) method with computer was used to increse the signal to noise ratio(S/N) in high resolution gas chromatographic trace analysis.
    将计算机快速富里叶变换(FFT)应用于高分辨率气相色谱痕量分析中,以增加色谱峰的S/N比(信号与噪声比),提高分析精度.
    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。
    0.61±0.12( F =22.47, P <0.01)and the contrast to noise ratio were 16.01±5.03;
    0.61±0.12(F=22.47,P<0.01); 肺实质与胸壁肌肉的对比噪声比为16.01±5.03;
    The MRI features of all lesions were analyzed and T1WI signal (T1S) and T2WI signal (T2S) of HCC and hemangioma were measured respectively. Then the contrast to noise ratio (CNR) of HCC and hemangiomas were calculated.
    分析病灶MRI特点及分别测量和计算HCC、血管瘤T1WI的信号强度(T1S)、T2WI信号强度(T2S)、及各自的对比噪声比(CNR)。
    Quality and quantity analysis were conducted based on contrast to noise ratio (CNR) and image quality of various sequences.
    进行了图像对比噪声比(CNR)值的测量,分析比较常规SE序列和动态增强的图像质量、病灶检出情况和病灶与周围胸壁深层结构的显示情况。
    The comparisons were based on the image resolution,normalized mean square error,contrast to noise ratio,and reconstruction time.
    基于Jaszczak和Shepp-Logan两组标准图像研究了不同投影模型对断层重建结果的影响,对重建图像分辨率、归一化均方误差、对比度-噪声比和重建时间等指标进行了比较。
    Vertebral metastases were evaluated by means of a contrast to noise ratio(CNR) and signal to noise ratio(SNR),and boundaries were compared between subtraction MRI images and conventional contrast T_1WI MR images.
    通过对比噪声比(CNR)、信噪比(SNR)以及肿瘤边界清晰程度的比较,对MR I减影与否进行评估。
    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);
    This article introduced the ROI technology coding algorithm thought,realized the choice of value S of MAXSHIFT method,proposed the method of ROI mask that backtracking,finally after introduced ROI through the experiment the image compression to carry on the comparison,compared the coding of the image with two ROIs through the experiment finally,has obtained the good compression ratio and the peak value noise ratio.
    论文介绍了ROI技术的编码算法思想,实现了MAXSHIFT方法尺度值S的选择,提出了ROI掩膜的生成方法即回溯法,最后通过实验对有两个ROI的图像进行编码比较,获得了较好的压缩比和峰值噪声比
    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)。
    The signal to noise ratio (SNR) of tumors, contrast to noise ratio (CNR) and signal intensity ratio (SIR) of tumors and normal liver were calculated and analyzed.
    计算不同图像中肿瘤信噪比(SNR)、肿瘤与肝脏对比噪声比(CNR)及信号强度比(SIR)等数据,并进行统计学分析。
    Correlative Study Between Identifications and Contrast to Noise Ratio (CNR) of the Small Solid Hepatic Lesions
    肝脏实性小占位对比噪声比与病灶性质的相关性
 

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