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  tomography
The case k=1, μ∈? corresponds to the exponential X-ray transform arising in single photon emission tomography.
      
Stability Estimates for Helical Computer Tomography
      
In this article we analyze an inversion formula for helical computer tomography proposed earlier by the author.
      
Design and implement of the signal generator in the magnetic focused conductivity tomography system
      
All of the above favors the use of software in the magnetic focused conductivity tomography system (MFCT) to reconstruct the image of conductivity within the human body.
      
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  computerized tomography
It is noted that the multiwavelength approach allows one to employ ideas of multiplex spectroscopy and computerized tomography, the film being characterized by solving an integral equation of the first kind.
      
Using computerized tomography (CT) we compared morphological changes of the parasitic lesions in the liver during the course of treatment.
      
The method is tested in 21 single photon emission computerized tomography (SPECT), performed with a cardiac phantom.
      
In this case study, B-scan ultrasonography as well as computerized tomography (CT) has been used to provide help in diagnosing the ciliary body tumor.
      
Imaging of the cardiovascular system with a combination of positron emission tomography (PET) and computer tomography (CT) or with a combination of single-photon emission computerized tomography (SPECT) and CT holds great promise for the future.
      
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  tomographic
This study was designed to compare the approaches and efficacies of two different ways of neurosurgical management for spontaneous putaminal hemorrhage (SPH): computed tomographic-guided aspiration (CTGA) and the key-hole approach (KHA).
      
Based on the high-resolution body wave tomographic image and relevant geophysical data, we calculated the form and the vertical and tangential velocities of mantle flow.
      
Positron emission tomographic study of the brain during involuntary syntactic processing
      
Acoustohydrophysical Complex for Marine Tomographic Research
      
An acoustohydrophysical complex for tomographic ocean surveillance is described.
      
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  tomography imaging
Computer tomography imaging of fast plasmachemical processes
      
Electron beam computed tomography imaging is used to detect coronary artery calcification, it is non-invasive and considerably less expensive than angiography.
      
With electron beam tomography imaging the coronary artery tree is visualized noninvasively and vascular calcification, a marker of atherosclerotic disease, is easily detected and its extent quantified.
      
Quantitative single-photon emission computed tomography imaging
      
Disease detection in advanced CAD is more accurate with stress echocardiography (ECG) and perfusion single-photon emission computed tomography imaging in women than with stress ECG.
      
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  其他


We derive out the frequency-wavenumber domain diffractionwaveequation in the weakly inhomogeneous medium from the elastic waveequation in theisotropic inhomogeneous medium, and give out the Green-function analysis solution;based on the synthetic scheme of the electromagnctic geophysicaI tomographic data,makethe solution linearization by using the reskemblance“Volume Eddy Current Technique( VEC)”,get the scattered field mumberical solution without Born or Rytovapproximation. This,formula is easily to be calculated.We...

We derive out the frequency-wavenumber domain diffractionwaveequation in the weakly inhomogeneous medium from the elastic waveequation in theisotropic inhomogeneous medium, and give out the Green-function analysis solution;based on the synthetic scheme of the electromagnctic geophysicaI tomographic data,makethe solution linearization by using the reskemblance“Volume Eddy Current Technique( VEC)”,get the scattered field mumberical solution without Born or Rytovapproximation. This,formula is easily to be calculated.We use the iterative tornographicinversion,this method employs an equivalent Neumann seriea solution in each iterationstep;use SVD method to solve the inverse problem and discuss the selection of the dampfactor. We have finished the two theoretical model cxperimenis.The reaults show that thistechnique is succossful and efficient,the resolution of the images is high.

从各向同性非均匀介质中弹性波波动方程出发,导出了在弱不均匀条件下,频率-波数域衍射场方程,给出了格林函数解析解。在电磁波地球物理层析成像数据合成的基础上,用类“体电流法(VCM)”,将解析解线性化,得到未作Born近似或Rytov近似的衍射场数值解,便于计算合成数据。采用迭代法进行反演,每步迭代中,采用等比Neumann级数解;反问题用SVD法求解,探讨了阻尼因子的取法。数值模型试验表明,这种算法是有效和成功的,成像的分辨率较高,对介质的均匀性要求有所降低,为实际应用创造了进一步条件。

Compared to a single-frequency diffraction tomography,the multifrequncy backscattering tomography(MFBT) in a vertically varying background improves greatly 1)Present address:Departement de Sismologie,Institut de Physique du Globe de Paris,4,Place Jussieu,F-75252 Paris Cedex 05, France the resolution and quality of images.The computation speed of the approach is much faster than other multifrequency methods such as multifrequency holograPhy,pre-stack migration,etc.It is more practical than the MFBT in a homogeneous...

Compared to a single-frequency diffraction tomography,the multifrequncy backscattering tomography(MFBT) in a vertically varying background improves greatly 1)Present address:Departement de Sismologie,Institut de Physique du Globe de Paris,4,Place Jussieu,F-75252 Paris Cedex 05, France the resolution and quality of images.The computation speed of the approach is much faster than other multifrequency methods such as multifrequency holograPhy,pre-stack migration,etc.It is more practical than the MFBT in a homogeneous background proposed by the literature and its computation speed by backpropagation is almost the same as that of the method in the literature.We have also presented a method of generating the Born scattered wave fields in spatial domain for a vertically varying background.

相对于单频衍射层析成像而言,垂向非均匀背景多频背向散射层析成像方法大大提高了图像的分辨率和质量;其计算速度比其它诸如多频全息术、叠前偏移等多频方法快得多;用反传播进行成像时,该方法的计算速度与有关文献提出的均匀背景相应的方法几乎相同,但该方法适用于垂向非均匀背景,因而更适于实际应用.本文还提出了垂向非均匀背景中空间域Born散射数据的一种快速形成方法.

The algorithm of solving 2D inverse scattering in time domain using maximum entropy is Proposed for reconstructing the velocity distribution in Corss-hole, VSP and SRP imaging system.At first, the relationship between scattering field in time domain and perturbation function is derived.Then, the model with maximum entropy is selected as inversed result by maximum entropy Cambridge algorithm and rcalization steps of this algorithm is given in this paper.In the computer numerical experiment, the results show that...

The algorithm of solving 2D inverse scattering in time domain using maximum entropy is Proposed for reconstructing the velocity distribution in Corss-hole, VSP and SRP imaging system.At first, the relationship between scattering field in time domain and perturbation function is derived.Then, the model with maximum entropy is selected as inversed result by maximum entropy Cambridge algorithm and rcalization steps of this algorithm is given in this paper.In the computer numerical experiment, the results show that the algorithm is effective to inverse incomplete wave field data with noise and the image quality is largely improved.

用最大熵求解二维时域逆散射问题的层析成像算法反演井间、VSP和SRP中的二维介质波速分布。首先给出时域散射场与介质扰动的关系式,然后,应用最大熵剑桥算法从所有满足时域散射数据的模型中挑选图像熵最大的模型作为反演结果,并给出了该算法的实现步骤。数值试验的结果表明,本文算法用于反演含噪声,不完全的时域波场数据时,十分有效。

 
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