Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Backscatter coefficients"”.
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On the Rayleigh -Brillouin scattering in air
… other applications.</p><p>In addition, Rayleigh backscatter coefficients in air, for the first time, were measured using the molecular photometric returns. The measured molecular backscatter coefficients are approximately twice as large as their theoretical counterparts. This could be related to …
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High frequency ultrasonic characterization of human skin In vivo
… methods using the attenuation coefficient, backscatter coefficient, and echo envelope statistics were studied for their potential to characterize human skin tissues in vivo. A high frequency ultrasound system was developed using polymer transducers, a pulser/receiver, high-speed digitizer, …
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Tropospheric aerosol detection over Southern Ireland using a backscatter Raman lidar
… test, Rayleigh test and zero bin test. Raman backscatter coefficients, extinction coefficients and lidar ratio were measured from April 2010 to May 2011 and February 2012 to June 2012. Statistical analysis of the profiles over these periods provided new information about the typical …
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Channel characterisation and modelling for transcranial Doppler ultrasound.
… including acoustic velocity, attenuation and backscatter coefficients. Finally, verification analysis is performed on the non-isotropic models against firstly, the blood flow phantom, and secondly, a patient recordings database. This analysis expands on areas of agreement and disagreement …
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Microultrasound Imaging of Tissue Dysplasia
… collected by scanning was used to compute the backscatter coefficients (BSC) and acoustic impedance (Z) of WT and ApcMin/+ mice. The 2D and 3D ultrasound images showed that µUS detects polyps < 500 µm in the scan plane. The measured values of BSC and Z showed differences between normal and …
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Estimating the concentration of ultrasound contrast agents using ultrasonic backscatter in vitro
… extracting estimates of UCA concentration using backscatter coefficients (BSCs) was developed and verified in vitro. Experiments to verify the method were performed with both UCAs and glass bead microspheres in degassed water using a beaker setup and a flow system setup. Experimentally obtained …
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Estimating forest attributes using laser scanning data and dual-band, single-pass interferometric aperture radar to improve forest management
… GeoSAR metrics were calculated from the X-band backscatter coefficients (four looks) as well as both X- and P-band interferometric heights and magnitudes. Both lidar and GeoSAR metrics were used as independent variables in best subsets regressions with LAI (measured in situ) as the dependent …
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Lidar remote sensing of aerosol and ozone profiles and application to air quality studies in New York City area
… of the correlation between ceilometer attenuated backscatter coefficients and ground PM2.5, and aerosol homogeneity. Results show better overall correlation between attenuated backscatter and ground PM2.5 in summer, with less degradation in correlation with height during summer. Seasonal variation …
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Using two-dimensional impedance maps to study acoustic properties of tissue microstructure
… monitoring therapy. In one approach to QUS, the backscatter coefficient (BSC) from a tissue is utilized to quantify and classify tissue state. The BSC is a fundamental property of a tissue based on the frequency power spectrum estimated from the RF signals corresponding to ultrasonic backscatter. …