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doppler spectrum     
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  多普勒频谱
     With Doppler spectrum analysis,resistance index in primary malignant tumors was 0.77±0.12,in metastatic tumors that was 0.71±0.07,whereas the average RI in benign lesions was below 0.6.The difference was significant.
     经多普勒频谱分析 ,肝脏良、恶性病变的阻力指数 (RI)存在显著性差异 (P <0 .0 0 1) ,原发性恶性肝肿瘤的RI值为 0 .77± 0 .12 ,转移性恶性肝肿瘤的RI值为 0 .71± 0 .0 7,良性病变RI平均值在 0 .6以下 ; 良、恶性占位的血流阻力不同与病变的病理组织结构有关。
短句来源
     Results All patients with postabortal intrauterine fetal residue were diagnosed by pathology,58 patients with much intraulerine fetal residue and 71 patients with less intrauterine fetal residue,2 cases with fetal residue in cervix,the display rate of colour flow was 93.2%, the pulsed wave Doppler spectrum showed lower resistance: RI 0.46±0.11.Conclusion TVS-CD has a certain diagnostic value in dectecting the incomplete abortion.
     结果132例宫内残留物全部经清宫后病理证实,多量残留58例,少量残留72例,宫颈残留2例,彩色血流显示率93.2%,其脉冲多普勒频谱(PW)呈滋养层低阻力动脉血流频谱:RI0.46±0.11。 结论TVS-CD对不全流产有重要的临床价值。
短句来源
     44 cases appeared that the jet with<5 mm, Doppler spectrum was twopeaks, positive continuity, peak flow velocity<0.5 m/s;
     ②44例分流束小于5mm,多普勒频谱为双峰、正向持续性,峰速度小于0.5m/s;
短句来源
     Assessment of normal left ventricular diastolic function by tissue Doppler imaging and flow Doppler spectrum
     组织多普勒成像和血流多普勒频谱评价正常人左室舒张功能
短句来源
     Study on Doppler spectrum changes of hepatic vein in early chronic parenchymal liver disease
     慢性实质性肝病早期肝静脉多普勒频谱变化研究
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  多普勒谱
     Multiple target distinguishing technique based on Doppler spectrum
     基于多普勒谱的多目标鉴别技术
短句来源
     Analysis of the experiment results under differentconditions reveals the effects of the different SNRs and the Doppler spectrum forms onthe accuracy of the correlation method, thus providing a guideline for the application ofthe method.
     通过不同条件下多次试验结果的分析,得出不同的信噪比及多普勒谱形对相关法测量多普勒谱宽精度的影响,这对于用相关法从实际的常规天气雷达信号中获取多普勒谱宽有一定的指导意义。
短句来源
     Based on the differences of Doppler spectrum signatures,two micro-Doppler features are presented for helicopter identification. One feature describes the asymmetry of Doppler spectrum distribution,and the other shows the contrast between the energy of echo-signals from fuselage and that from blades. Finally a simulation with synthetic data and experiment data is presented,and the simulation result shows the validity of the method.
     详细分析了直升机目标回波信号的多普勒谱的构成,针对直升机目标和固定翼飞机目标多普勒谱的差别,提取了两种微多普勒特征用于识别直升机目标和固定翼飞机目标,其中一种利用了直升机回波信号正负多普勒频谱能量的不对称性,另外一种利用了机身回波信号能量与旋翼回波信号能量的对比,使用仿真数据和试验测试录制的数据计算结果表明,该方法具有很好的识别效果。
短句来源
     DOPPLER SPECTRUM OF IONOSPHERIC IRREGULARITIES
     电离层不规则结构的多普勒谱特性
短句来源
     In the second chapter, a wideband MIMO channel model with multiple-tap was integrated according to the angle of departure of the transmitting signal and its spread angle, the angle of arrival of the receiving signal and its spread angle, power azimuth spectra, Doppler spectrum and the geometric construction of antenna array both sides of transmit and receive, on the basis of full research on the theories of space-time channel model proposed in the recent literature.
     第二章在对最近文献中提出的一些空时信道模型理论进行详细研究的基础上,根据发射信号的离开角及其扩展角、接收信号的到达角及其扩展角、功率方位谱、多普勒谱和收发两端天线的拓扑结构,综合了一个多抽头的宽带MIMO信道模型。
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  频谱多普勒
     Role of Doppler spectrum technique in the quantitative analysis of chronic renal function failure
     频谱多普勒技术在慢性肾功能损害定量分析中的意义
短句来源
     QTVI found abnormal diastolic function in patients even with the normal value of VE/VA. Furthermore,QTVI was able to demonstrate localized ventricular movement and seems more sensitive than the Doppler spectrum analysis.
     应用QTVI能够检出二尖瓣血流频谱VE/VA正常的舒张功能异常,并能检测出等容舒张期局部心肌的异常活动,较频谱多普勒更加敏感。
短句来源
     Objective To compare the value of conventional ultrasonography (US, including gray-scale ultrasonography, color Doppler flow imaging and Doppler spectrum) and ultrasonic elastography (UE) in differentiating the benign and malignant breast lesions.
     目的比较常规超声(包括灰阶超声、彩色多普勒血流显像、频谱多普勒超声)及超声弹性成像对良、恶性乳腺肿块的鉴别诊断价值。
短句来源
     The blood stream signals on the tumor's inside and margin are showed on CDFI,the typical artery,typical vein and non-typical artery spectra are measured by Doppler spectrum.
     CDFI观察肿瘤的内部和边缘有血流信号。 频谱多普勒测得典型的动脉频谱,静脉频谱和非典型的频谱。
短句来源
     Methods In 28 patients with hypertrophic cardiomyopathy left anterior descending artery and interventricular septum branch flow were displayed using coronary flow Doppler imaging system before and after PTSMA,and flow velocity were measured by Doppler spectrum.
     方法 肥厚型梗阻性心肌病 2 8例 ,于化学消融术前和消融术后 ,采用胸骨旁左心室长轴、胸骨旁左心室短轴、胸骨旁心底短轴观显示前降支、室间隔支的血流 ,频谱多普勒测量血流速度、流速积分。
短句来源
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  多普勒频谱图
     A Comparative Study of Ventricular Wall Motion by Cardiac Wall Doppler Spectrum and M-UCG
     心壁多普勒频谱图与M—UCG关于室壁运动的对比研究
短句来源
     Cardiac wall Doppler spectrum (CWDS) is a new method measuring ventricular wall systolic-diastolic motion velocity be using pulsed mode Doppler technique.
     心壁多普勒频谱图(cardiacwalldopplerspectrum,CWDS)是用脉冲式多普勒技术检测室壁舒缩运动速度的新方法。
短句来源
     Results Both the air and the emboli induced similar high intensity transient signals(HITS)in Doppler spectrum.
     结果 不管是气泡栓子还是全血凝块栓子在多普勒频谱图上均产生相似的高强度短暂信号。
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  doppler spectrum
Important channel parameters measured at the mobile terminal such as the angular power distribution, Doppler spectrum, and multipath shape factors are also investigated to further exemplify the usefulness of the proposed model.
      
The analysis provides the required information about the temporal stability of the channel, the probability of occurrence and depth of fades, the Doppler spectrum and, in general, the influence of the environment on the signal behaviour.
      
In particular, the slow time varying nature of the channel is studied and the narrow Doppler spectrum shape is approximated.
      
The simulations are conducted in a multipath channel with Rayleigh fading and 300 Hz Doppler spectrum with additive white Gaussian noise.
      
Comparison with the experimental data shows that the developed theoretical model of a Doppler spectrum is in good agreement with the observations.
      
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