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Tissue Doppler Imaging (TDI) is an excellent tool for early detection of myocardial dysfunction, as well as for prognosis and follow-up of the myocardial function after surgical treatment. However, since it exploits the same principles of color flow imaging, TDI requires to balance frame rate with field of view. A novel TDI technique based on multiline transmission (MLT), i.e. the simultaneous transmission...
Tissue Doppler Imaging (TDI) is an excellent tool for early detection of myocardial dysfunction, as well as for prognosis and follow-up of myocardial function after surgical treatment. However, since it exploits the same principles of color flow imaging, TDI requires to balance frame rate with field of view. A novel TDI technique, based on multi-line transmission and multi-line acquisition, was shown...
Multi-line transmission (MLT) is a recently developed method for high frame rate cardiac ultrasound imaging. However, a potential pitfall of this method is the presence of artifacts due to cross-talk between the MLT beams. Low complexity adaptive beamforming (LCA) is a high resolution adaptive beamforming method that chooses a weighting function out of a predefined set of apodization functions assembled...
In this work, we have explored a new method which based on Bayesian assimilation for monitoring methane (CH4) emissions at different rice phenological stages. Specifically, we investigate two algorithms, one based on the ground-based radar scatterometer (GBRS) with full polarization (HH, HV, VH, and VV) and the other based on the mechanistic process of agricultural model concluded the parameters of...
This paper uses the GA-SVM inversion model to invert the suspended matter concentration in Longquan Lake. Genetic algorithm (GA) optimizes the parameters of the SVM inversion model to establish the new GA-SVM inversion model, and GA can effectively improve the efficiency and the accuracy of the SVM inversion model. The inversion model was established by using the measured hyperspectral data and suspended...
In order to study the coherence characteristics of low-backscattering objects such as roads and rivers, we introduce a coherence estimation approach based on clustering method. When the approach is applied to multi-temporal high-resolution TerraSAR-X images in urban areas, the results show that the coherence of roads is higher than that of rivers and shadows. This indicates that coherence features...
Vegetation coverage is an important indicator for forecasting geological disasters in mountainous areas such as landslide. However, it is a challenge to extract vegetation coverage in complex terrain from SAR image. A major problem is that the variation of the backscatter coefficient of the same object varies with the local incidence angle. As a result, a large number of discrete points appear in...
High temporal and spactial resolution aerosol retrieval is a difficult task because of the absence of corresponding satellite data. Due to the lack of a shortwave infrared band near 2.1 um aboard on Gaofen-4 instrument, which is critical for determining surface reflectance. In this paper, a new algorithm resolving the problem based on Gaofen-4 that was placed in Geosynchronous (GEO) orbit and Landsat-8...
This paper presents an unsupervised segmentation method based on the variational model for fully polarimetric Synthetic Aperture Radar (PolSAR) images. Considering that fully PolSAR images contain much more information than optical or single-channel SAR images, we used the characteristics vector of PolSAR images instead of statistical parametric models in the variational model. To fully utilize characteristics...
With the development of technology of digital camera, the performance of image sensor is continuously improving, which makes it possible to measure leaf area index by digital photos in a simpler and cheaper way compared with the other ways. This article proposed a new way to measure LAI by using digital images, and the formulation of measuring LAI is deduced from both the principle of LAI2000 and...
This paper reports on an experiment conducted at the wind-wave tank in UESTC microwave chamber to characterize the C- and X-band radar return from water surfaces covering oil films when observed at different incidences. The measurements of Normalized Radar Cross Section (NRCS) with bi-objective calibration technique were carried out for full polarization and various wind speeds. Comparisons are performed...
This paper made a coherence analysis to access the ability of snow extraction based on the Terra-SAR X-HH data, and develop a method using multi-temporal coherence combined with the traditional method. Two pairs of Terra-SAR data with the same temporal baseline and similar spatial baseline were chosen, before and after snowfall. Traditional method was used to remove the snow free area with relative...
In this paper, the dynamic programming algorithm (DPA) is firstly proposed to analyze microwave minor scattering from advanced Michigan microwave canopy scattering (MIMICS). According to the decision stages which divided by the incidence angle, we use the DPA to study the underlying submerge information under the vegetation. Simultaneously, constructed in the DPA, the multidimensional sequence of...
Landslides cause great harms to transmission line corridor in mountainous area. This paper uses a method of identifying landslides to evaluate harmfulness to power towers. First, the mountainous area is classified as nine categories in terms of polarimetric decomposition techniques and clustering algorithm. Second, landslides are detected based on the change of areas before and after a landslide with...
Multiple-line transmit (MLT) techniques, involving the simultaneous transmission of multiple focused beams into different directions, increase the frame rate without significantly compromising the resolution or contrast. The higher frame rate can facilitate the assessment of regional myocardial deformation or of left ventricular dyssynchrony. However, application in clinical routine is still hindered...
Flood is one of serious natural disasters in the word. Synthetic aperture radar (SAR) has become a popular tool to detect the flood disaster for its distinct benefits such as retrieval of surface information, penetrability, and availability in all weathers. This paper aims to analyze microwave scattering characteristics of soil from low water content to semi-flooded status based on ground-scatterometer...
Aerosol retrieval over urban areas is a difficult task because of the high reflectance of the underlying surface. In this paper, a new aerosol retrieval algorithm based on the spectral analysis of soil and vegetation from spectral library was proposed, the simulated correlation between the normalized difference vegetation index (NDVI) and the surface reflectance of red, blue bands was established...
In this paper, a method for road detection based on Duda and path operators has been presented. The roads are represented as slender dark regions with constant width and reflectance in the high-resolution SAR images. The path operators (path openings and closings) were performed as morphological filters in retaining linear structures. However, the filters were not sensitive to the width of linear...
This paper presents a landslide prediction method based on soil moisture estimation obtained by fully polarimetric Synthetic Aperture Radar (SAR) data and surface topography acquired by Shuttle Radar Topographic Mission (SRTM). In order to solve the problem of geometric distortion caused by topography, the study area is classified as measurable and non-measureable areas in terms of the terrain slope...
The paper aimed to investigate interaction between electromagnetic wave and cereal parameters at column and row directions. S-band (center frequency 3.2GHz) and wheat had been selected as the research targets. During an entire wheat growth cycle, a series of data related to the interaction were collected for the analyses. Backscatter at row and column directions were analyzed as the function of the...
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