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noise ratio
相关语句
  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)。
短句来源
    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。
短句来源
    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 ) ;
短句来源
    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。
短句来源
    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 )。
短句来源
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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
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
    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。
短句来源
    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。
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
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  “noise ratio”译为未确定词的双语例句
    The image quality including clearness,contrast to noise ratio(CNR)and signal to intensity ratio(SIR)of HR-MRI T1 WI and T1 WI scan in the diagnosis of pleural disease were compared.
    对HR-MRI T1WI与常规T1WI的图像质量(胸壁结构显示清晰度、对比噪声比及信号强度对比度)进行比较。
短句来源
    Methods: Seventy two SD rats, 4 rats a group at random, underwent MR enhancement with 0, 2, 5, 8, 10, 12, 15, 20, 30, 40, 50, 60, 70, 80, 100, 140, 210, 280 μmol/kg SPIO respectively after plane examination. The signal to noise ratio of liver was measured and a curve of dosage gradient liver signal intensity was made.
    方法 :72只正常 SD大鼠随机分成 18个样本组 ,每组 4只。 平扫后分别以 0、2、5、8、10、12、15、2 0、30、40、5 0、6 0、70、80、10 0、140、2 10、2 80μm ol/kg SPIO剂量行增强扫描 ,作剂量梯度 -肝脏信号曲线。
短句来源
    Conclusion: Good effect of T 1 and T 2 enhanced MR imaging can be acquired at the dose of 20 10 μmol/kg SPIO respectively, the best contrast to noise ratio is found on T 2 weighted enhanced MR image. [
    结论 :重点观察 T1 加权序列及 T2 加权序列的 SPIO最佳剂量分别为 2 0 μmol/kg和 10 μmol/kg。
短句来源
    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
    Results 89 Sr bremsstrahlung spectrum is a continuous curve,the main energy peak is about 79keV.When the energy window is properly broad,SPECT system fitted with pine hole,diverging,medium or high energy,parallel hole collimator can always produce ideal images that have both a higher signal noise ratio and a higher sensitivity.
    结果 89Sr韧致辐射的能谱为一连续曲线,主能峰约为79keV,适当范围能窗并配以针孔、发散型、中能或高能平行孔准直器时即可获得信/ 噪比及灵敏度均较高的理想图像。
短句来源
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  noise ratio
Fast identification of digital amplitude modulation level at low signal-to-noise ratio
      
Simulation results reveal that the AR scheme with its decision algorithm outperforms the conventional and other modified TR schemes in generalized signal-to-noise ratio (SNR).
      
The SNR (signal-to-noise ratio) of the vibration signals of a diesel cylinder lid is the highest.
      
Identification of Discrete Linear Objects with a Large Signal-to-Noise Ratio
      
Methods for the conversion of image silver nanoparticles into luminescent products were developed; this considerably increased the signal-to-noise ratio of luminescence reading.
      
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This study is based on operation—proved 35 patients.Through reviewing,analizing and com-parig the results of ULF—MRI with the operation and comparing with the lumbar sacral plain filmand epidurography with iodine liquid,we would like to obtain a through understanding of the diag-nostic values of ULF—MRI as well as its limits.We found that in diagnosing protrusion of lumbardisc degenerative changes and/or protrusion of pulpous nucleus and thickness of ligament flavin etc.the value of ULF—MRI is rathr high,being...

This study is based on operation—proved 35 patients.Through reviewing,analizing and com-parig the results of ULF—MRI with the operation and comparing with the lumbar sacral plain filmand epidurography with iodine liquid,we would like to obtain a through understanding of the diag-nostic values of ULF—MRI as well as its limits.We found that in diagnosing protrusion of lumbardisc degenerative changes and/or protrusion of pulpous nucleus and thickness of ligament flavin etc.the value of ULF—MRI is rathr high,being same with those seen in the operation.But,owing to thelow field strength and low signal—noise ratio,discrimination of the fragments of pulpous nucleus in-truding into the spinal canal,granulomatous and adhesive tissues seen in operation could not befound when the MR imaging is reviewed.Narrowing of the lateral lacuna of the spinal canal,hyper-ostosis of superior and inferior articular process,minute calcified in ligament and/or nucleus,etc.can not be seen as clearly as in the X-CT transaxial view.Therefore,we think the best way is totake a lumbosacral plain film first and then an ULF—MRI for ruling out disc or pulpous nucleuspathologic change.An X-CT canning should be made if neccessary.In this way,the diagnosis oflumbar disc disease made before operation can be more correct and perfect.

本文以35例手术证实的腰椎间盘病变为基础,回顾性对照分析超低场 MRI 结果和手术所见,并与腰椎平片和椎管膜外碘中造影进行比较,从而了解超低场 MRI 对本病的诊断价值和限度。结论为超低场 MRI 诊断椎间盘突出.髓核变性和(或)膨出,黄韧带肥厚等价值较高,与手术所见完全相符。唯因超低场 MRI 信噪比低,T_1相横断面空间分辨率亦低,影响椎管内组织间细节的辨别而不能满意显示椎管内髓核逸入蛛网膜下腔,肉牙组织修复粘连等组织内容物。对估价侧隐窝狭窄,小关节突骨质增生.韧带和髓细微钙化等亦不及 X-CT 横断面清晰。综上情况,我们认为对腰椎间盘病变诊断,宜先拍腰骶椎 X 线平片,用超低场 MRI 查出盘突,变性等病变,如有必要再对某时空节段做 X-CT 检查,可使术前诊断更为完善。

Quality assurance is the basis in the diagnosis with MR imaging. Because ofthe characteristics of multiple para-meters in MR, the techniques and functions of the machine,the body tissue parameters, and the imaging Parameters must be fully mastered and properly arranged, so as to achieve the purpose of acquiring the high-quality images. Through the analysis of the clinical practice, the authors discussed the main factors that in fluent the image quality, the technical points concerning the improvement of signal/noise...

Quality assurance is the basis in the diagnosis with MR imaging. Because ofthe characteristics of multiple para-meters in MR, the techniques and functions of the machine,the body tissue parameters, and the imaging Parameters must be fully mastered and properly arranged, so as to achieve the purpose of acquiring the high-quality images. Through the analysis of the clinical practice, the authors discussed the main factors that in fluent the image quality, the technical points concerning the improvement of signal/noise ratio, contrast resolution,and spacial resolution and the optimal selection of the imaging parameters as well.

高质量的图像是MR诊断的基础.MR有多参数成像的特点,操作者必须充分利用机器的技术指标,掌握人体组织固有的参数及与成像参数之间的关系优化组合,以达到提高图像质量之目的.本文着重讨论了影响MR图像质量的主要因素,提高信噪比、对比分辨率和空间分辨率等技术措施以合理地选择成像参数.

An objective and quantitative method, which uses the ratio of harmonics to noise components to estimate the hoarse degree of a voice, is described, and the practical algorithm thatis used to extract the harmonics to noise ratio(HNR)is discussed in detail. Experiment and clinical application indicates that this acoustic parameter can reflect the characteristics of pathological speech effectively and has important application ...

An objective and quantitative method, which uses the ratio of harmonics to noise components to estimate the hoarse degree of a voice, is described, and the practical algorithm thatis used to extract the harmonics to noise ratio(HNR)is discussed in detail. Experiment and clinical application indicates that this acoustic parameter can reflect the characteristics of pathological speech effectively and has important application value.

文章介绍了用嗓音中谐波分量与噪声分量的比值来客观定量地评估嗓音嘶哑程度的方法,并对提取谐波噪声比(HNR)的具体算法做了分析讨论.实验和临床使用表明,这个声学参数能够很好地反映病变语音的特性,具有重要的应用价值

 
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