多普勒法测量精度不高。
目的探讨D -山梨醇肝脏清除率法和超声多普勒法相结合评估肝储备功能的可行性。
Objective To evaluate the hepatic function reserve by using clearance rate of D-sorbitol in combination with Doppler sonography.
方法利用彩色多普勒血流显像和脉冲多普勒法对30例高血压病人左室舒张功能进行评价。
Method The diastolic function of 30 patients with hypertension were studied with colour flowing imaging and pulsed doppler.
本文阐述了超声波流量计常用的时差法、多普勒法的测流原理，以及超声波流量计的分类。
This paper explained the commonly used principle of ultrasonic flow meter: time-difference method and Doppler method and introduced the classification of the ultrasonic flow meter.
以多普勒法的谷物收获超声波流量计为研究对象，进行谷物收获系统和超声波流量计的前期研究。
We research corn harvest system of ultrasonic flowmeter by Doppler in this paper, start the prophase research work on corn harvest system and ultrasonic flowmeter.
径向速度法，也被称为多普勒摆动技术，用于搜索恒星光线的摆动，它显示出来自轨道上运行的行星的万有引力。
Radial velocity, also known as the Doppler wobble technique, involves searching for wobbles in a star's light that indicate the gravitational pull of an orbiting planet.
讨论了利用GPS多普勒频移观测值确定运动载体速度的基本原理，估计出采用这一方法可以达到的精度。
The basic principle for determining the speed of moving vehicles with GPS Doppler observed values is discussed, and the available accuracy with this method is presented.
正交相位法是超声多普勒技术中提取双向性血流信息的一种重要方法。
Quadrature phase method is one of the important methods in directional blood flow information detection using Doppler ultrasound techniques.
本文详细的论述了依据正交相位检测法提取多普勒频移信号的方法，并对各部分实现电路作一简要的介绍。
This paper has discussed the way of probing Doppler shift signal based on crossed phase detecting method in detail and introduced each function circuits briefly.
本方法对目标回波信号采用了相干视频模拟法，在视频上模拟目标回波的多普勒频率。
In the method, the target reflected signal is generated by the way of coherent video simulation and the Doppler frequency of target is simulated on video.
用彩色多普勒血流会聚法对20例动脉导管未闭患者的左向右分流率F进行测定，并根据F值计算出动脉导管的横截面积A。
The left to right shunt rate (f) and the transverse sectional area of ductus arteriosus (a) were calculated by color Doppler flow convergence method in 20 patients with patent ductus arteriosus.
对于使用高脉冲重复频率的主动多普勒雷达导引头，连续波近似法不仅计算相对简单，而且可以给出较高的计算精度。
For a Doppler radar homing seeker with high pulse repetition frequency, the continuous wave approximation is not only simple, but also has a high calculation accuracy.
结论在彩色多普勒超声引导下运用压迫法结合瘤腔内注射凝血酶治疗假性股动脉瘤的方法是安全有效的。
Conclusion the therapeutic effect of false arteria femoralis by using compression method and injecting thrombin into aneurysm cavity by color doppler ultrasonic guidance is therapeutical and safe.
获取每个关节的灰阶(GS)和强力多普勒(PD)信号，采用半定量法为每个参数进行评分(0 - 3)。
Individual joints were scanned for grey scale (GS) and power Doppler (PD) signal using a semi-quantitative scoring scale (0-3) for each parameter.
组织追踪法是基于组织多普勒显像的一种新技术。
Tissue Tracing (TT) is a recently developed technique based on tissue Doppler imaging.
材料与方法：应用彩色多普勒超声显像法对25例可疑异位妊娠患者进行观察。
Materials and Methods: 25 cases of clinically suspected EP were observed by Color Doppler Ultrasonography.
法施术于健康男性左下肢腓肠肌处，法前后采用彩色超声多普勒诊断系统测量腘动脉平均血流量(VF)。
Healthy men received rolling manipulation on left gastrocnemius muscle in prone position. Average volume flow (VF) in popliteal artery was measured by Doppler before and after rolling manipulation.
采用原子蒸气束激光诱导荧光法测量钆原子的第一激发态的同位素位移及超精细结构、原子跃迁自发辐射的分支比和原子蒸气束的多普勒宽度。
The isotope shifts, hyperfine structure, spontaneous emission branch ratio of the first excited level and Doppler width of the atom vapor beam were measured using laser induced fluorescence.
本文提出了一种新的方法，多普勒外差法测量表面面形，并首次提出和制作了同步相位计。
This paper describes a new method, Doppler heterodyne measurement method of surface profile, using a simultaneous phase comparator.
监听胎儿心率是胎儿监护的主要方法之一，基于超声多普勒效应的胎心率检测法是一种有效的无创方法。
One of the main methods of fetal monitoring is monitoring the fetal heart rate (FHR), and the method based on Ultrasonic Doppler effect is a effective method without wound to detect the FHR.
为提高合成孔径声纳（SAS）解多普勒质心模糊的准确性，文章对传统的解模糊算法-波长差异法进行了改进。
In order to improve the precision of the method which is used to resolve Doppler centroid ambiguity of SAS, an improved method for the wavelength diversity algorithm is proposed in this paper.
在多普勒调频斜率估计中，时频分析法比较直观，估计精度也不错，脱机处理中获得了广泛的应用，图像偏移法估计速度快，在运动补偿中得到了应用。
Image offset method that is also fast can be applied to motion compensation, time-frequency method is intuitionistic and have a better accurate, which is applied extensively on offline.
彩色多普勒血流会聚法是一种准确的血流全定量方法。
Color Doppler flow convergence is an accurate flow quantitative method.
本文选用多普勒频率变化率定位法作为海上无源探测系统的定位方法。
The paper selects the Doppler changing rate method in naval passive location system.
基于单一载频的射频干扰（RFI）在线性调频雷达中的表现形式，利用平均距离谱法获得了RFI的多普勒分布谱图。
A method for surpressing RFI in a chirp radar based on averaging range spectrum is developed, by averaging range spectra, the RFI can be detected and suppressed in time-frequency domain.
本文使用共振多程池的光声探测法对CO_2和SF_6分子的无多普勒饱和吸收光谱进行了实验研究。
The Doppler-free saturated spectroscopy of the CO2 and SF6 molecules is investigated experimentally by using optoacoustic detection with a resonant multipass cell.
论文还采用彩色谐波多普勒的方法对均值滤波法进行了改进。
Finally, the color harmonic Doppler method is brought up to enhance the effect of the Average Filtering method.
方法分别应用二维法（2D法）、多普勒压力减半时间法（PHT法）及实时三维容积法（RT3DE）检测18例行PBMV患者手术前后MVA。
Methods MVA was estimated in 18 patients before and after PBMV, using two-dimensional echocardiography(2DE), Doppler pressure half-time(PHT) and volumetric RT3DE.
结果表明，M型彩色多普勒血流会聚法与二维彩色多普勒血流会聚法在检测二尖瓣狭窄瓣口面积方面基本可靠，但两者的准确性无显著差异。
It was concluded that M-mode and two-dimensional color Doppler flow convergence region could be used to quantificate the area of mitral stenosis accurately.
结果表明，M型彩色多普勒血流会聚法与二维彩色多普勒血流会聚法在检测二尖瓣狭窄瓣口面积方面基本可靠，但两者的准确性无显著差异。
It was concluded that M-mode and two-dimensional color Doppler flow convergence region could be used to quantificate the area of mitral stenosis accurately.
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