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Littérature scientifique sur le sujet « Tomography and anisotropy »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Tomography and anisotropy"

Carrion, Philip, Jesse Costa, Jose E. Ferrer Pinheiro, and Michael Schoenberg. "Cross‐borehole tomography in anisotropic media." GEOPHYSICS 57, no. 9 (1992): 1194–98. http://dx.doi.org/10.1190/1.1443333.

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Anisotropy has significant effect on traveltime cross‐borehole tomography. Even relatively weak anisotropy cannot be ignored if accurate velocity estimates are desired, since isotropic traveltime tomography treats anisotropy as inhomogeneity. Traveltime data in our examples were synthetically generated by a ray‐tracing code for anisotropic media, and the computed quasi‐P‐wave traveltimes were subsequently inverted using the “dual tomography” technique (Carrion, 1991). The results of the tomographic inversion show typical artifacts due to the anisotropy, and that accurate imaging is impossible

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Koren, Zvi, Igor Ravve, Gladys Gonzalez, and Dan Kosloff. "Anisotropic local tomography." GEOPHYSICS 73, no. 5 (2008): VE75—VE92. http://dx.doi.org/10.1190/1.2953979.

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Local tomography is interactive, ray-based, residual-interval-parameter analysis for updating background anisotropic velocity parameters. The method operates directly on image gathers generated by anisotropic curved-ray Kirchhoff time migration. A locally 1D, spatially varying, vertical transversely isotropic model is assumed. The background anisotropy parameters are the instantaneous (interval) vertical compression velocity [Formula: see text] and the two Thomsen anisotropy parameters, [Formula: see text] and [Formula: see text]. The interval velocity [Formula: see text] is updated from short

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Confal, Judith M., Paola Baccheschi, Silvia Pondrelli, et al. "Reproducing complex anisotropy patterns at subduction zones from splitting intensity analysis and anisotropy tomography." Geophysical Journal International 235, no. 2 (2023): 1725–35. http://dx.doi.org/10.1093/gji/ggad329.

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SUMMARY Measurements of seismic anisotropy provide a lot of information on the deformation and structure as well as flows of the Earth's interior, in particular of the upper mantle. Even though the strong and heterogeneous seismic anisotropic nature of the upper mantle has been demonstrated by a wealth of theoretical and observational approaches , most of standard teleseismic body-wave tomography studies overlook P- and S-wave anisotropy, thus producing artefacts in tomographic models in terms of amplitude and localization of heterogeneities. Conventional methods of seismic anisotropy measurem

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Pratt, R. G., W. J. McGaughey, and C. H. Chapman. "Anisotropic velocity tomography: A case study in a near‐surface rock mass." GEOPHYSICS 58, no. 12 (1993): 1748–63. http://dx.doi.org/10.1190/1.1443389.

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Cross‐borehole data were acquired in the surface crown pillar of a massive sulfide ore mine. The data consist of five, two‐dimensional (2-D), cross‐borehole panels, each with approximately 900 source‐receiver pairs. The panels were located within the crown pillar at either side of and within a major subvertical fault zone that intersects the orebody. An initial analysis of the data indicates that the bedrock containing the orebody is seismically anisotropic. A rigorous analysis of the traveltimes using anisotropic velocity tomography confirms the initial assessment that anisotropy exists withi

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Zhou, Chaoguang, Junru Jiao, Sonny Lin, John Sherwood, and Sverre Brandsberg-Dahl. "Multiparameter joint tomography for TTI model building." GEOPHYSICS 76, no. 5 (2011): WB183—WB190. http://dx.doi.org/10.1190/geo2010-0395.1.

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Model building for tilted transversely isotropic media has commonly been performed by a single parameter tomography that updates the velocity in the symmetry direction, while the orientation of the symmetry axis and Thomsen parameters [Formula: see text] and [Formula: see text] are typically estimated from the migration stack and well data. Unfortunately, well data are often not available. In addition, when they are available, their lateral sampling is typically very sparse and their vertical sampling usually spans only a limited range of depths. In order to obtain spatially varying anisotropi

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Hadden, Shaun, R. Gerhard Pratt, and Brendan Smithyman. "Anisotropic full-waveform inversion of crosshole seismic data: A vertical symmetry axis field data application." GEOPHYSICS 84, no. 1 (2019): B15—B32. http://dx.doi.org/10.1190/geo2017-0790.1.

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Anisotropic waveform tomography (AWT) uses anisotropic traveltime tomography followed by anisotropic full-waveform inversion (FWI). Such an approach is required for FWI in cases in which the geology is likely to exhibit anisotropy. An important anisotropy class is that of transverse isotropy (TI), and the special case of TI media with a vertical symmetry axis (VTI) media is often used to represent elasticity in undeformed sedimentary layering. We have developed an approach for AWT that uses an acoustic approximation to simulate waves in VTI media, and we apply this approach to crosshole data.

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Michelena, Reinaldo J. "Singular value decomposition for cross‐well tomography." GEOPHYSICS 58, no. 11 (1993): 1655–61. http://dx.doi.org/10.1190/1.1443381.

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I perform singular value decomposition (SVD) on the matrices that result in tomographic velocity estimation from cross‐well traveltimes in isotropic and anisotropic media. The slowness model is parameterized in four ways: One‐dimensional (1-D) isotropic, 1-D anisotropic, two‐dimensional (2-D) isotropic, and 2-D anisotropic. The singular value distribution is different for the different parameterizations. One‐dimensional isotropic models can be resolved well but the resolution of the data is poor. One‐dimensional anisotropic models can also be resolved well except for some variations in the ver

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Gao, Zirui, Manuel Guizar-Sicairos, Viviane Lutz-Bueno, et al. "High-speed tensor tomography: iterative reconstruction tensor tomography (IRTT) algorithm." Acta Crystallographica Section A Foundations and Advances 75, no. 2 (2019): 223–38. http://dx.doi.org/10.1107/s2053273318017394.

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The recent advent of tensor tomography techniques has enabled tomographic investigations of the 3D nanostructure organization of biological and material science samples. These techniques extended the concept of conventional X-ray tomography by reconstructing not only a scalar value such as the attenuation coefficient per voxel, but also a set of parameters that capture the local anisotropy of nanostructures within every voxel of the sample. Tensor tomography data sets are intrinsically large as each pixel of a conventional X-ray projection is substituted by a scattering pattern, and projection

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Leinss, S., H. Löwe, M. Proksch, J. Lemmetyinen, A. Wiesmann, and I. Hajnsek. "Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series." Cryosphere Discussions 9, no. 6 (2015): 6061–123. http://dx.doi.org/10.5194/tcd-9-6061-2015.

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Abstract. Snow settles under the force of gravity and recrystallizes by vertical temperature gradients. Both effects are assumed to form oriented ice crystals which induce an anisotropy in mechanical, thermal, and dielectric properties of the snow pack. On microscopic scales, the anisotropy could be hitherto determined only from stereology or computer tomography of samples taken from snow pits. In this paper we present an alternative method and show how the anisotropy of a natural snow pack can be observed contact- and destruction-free with polarimetric radar measurements. The copolar phase di

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Han, S.-M., and J.-Y. Rho. "Dependence of broadband ultrasound attenuation on the elastic anisotropy of trabecular bone." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 212, no. 3 (1998): 223–26. http://dx.doi.org/10.1243/0954411981534006.

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The effect of trabecular elastic anisotropy on broadband ultrasound attenuation (BUA) and bone mineral density (BMD) was investigated with human and bovine cubic cancellous bones. Ultrasonic parameters describing trabecular anisotropy were found from the three orthogonal ultrasound velocities. BMD was measured using quantitative computed tomography. Three elastic anisotropy ratios were compared to BUA in all three directions and to BMD. The combined effect of anisotropic characteristics and BMD was also correlated with BUA. The results showed that the anisotropy ratios were significantly relat

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Thèses sur le sujet "Tomography and anisotropy"

Zhang, Qie Sandvol Eric Alan. "Seismic tomography and anisotropy: studies of intraplate seismic zones." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6855.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 24, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Eric Sandvol. Vita. Includes bibliographical references.

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Segovia-Martinez, Manuel. "Texture anisotropy analysis of brain scans." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/844053/.

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Currently, the world population is aging. People over 75 is one of the fastest growing age groups. This is the group most affected by Alzheimer's disease. Reliable early diagnosis and tracking methods are essential to assist therapy and prevention. This research aims to study anisotropy texture in tomographic brain scans to diagnose and quantify the severity of Alzheimer's disease. A full methodology to study computer tomography, magnetic resonance imaging and multispectral magnetic resonance imaging is presented in this thesis. Before applying any texture method to the tomographic brain image

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Hammond, William Charles. "Dynamics, flow and melt content of the Southern East Pacific Rise upper mantle from teleseismic tomography /." view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9998033.

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Thesis (Ph. D.)--University of Oregon, 2000.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 139-151). Also available for download via the World Wide Web; free to University of Oregon users.

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Bui, Truong Son. "Caractérisation et modélisation de l’endommagement des géomatériaux par méthode ultrasonore." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2018/document.

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Ce travail de recherche est consacré à l’étude de l’endommagement des géomatériaux en utilisant la méthode non destructive par ultrasons. Pour atteindre cet objectif, nous développons dans un premier temps un dispositif à ultrasons modern et novateur qui, en combinant avec un système de sollicitation mécanique, permet de caractériser le processus de l’endommagement du matériau au cours des essais telle que la compression uniaxiale/triaxiale. Plus précisément, le système ultrasonore construit comporte 96 voies et au cours des essais il est capable de mesurer de manière continue les trois types

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Huang, Hui Ph D. Massachusetts Institute of Technology. "Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87518.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The primary objective of this thesis is to improve our understanding of the crustal structure and deformation in the southeastern Tibetan Plateau and adjacent regions using surface wave tomography. Green's functions for Rayleigh and Love waves are extracted from ambient noise interferometry. Using the Green's functions, we first conduct traditional traveltime tomography for the two shear wavesp

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Salaun, Gwénaëlle. "Structure et déformation du manteau supérieur de la région Egée-Anatolie par tomographie en ondes de Rayleigh." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENU025/document.

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La tectonique actuelle et récente (~40 Ma) de la région Egée-Anatolie en fait un laboratoire naturel privilégié pour l'étude de la déformation continentale. L'analyse de la structure détaillée et de la déformation du manteau de cette zone de collision continentale immature constitue une étape indispensable pour comprendre les relations entre la cinématique de surface et la dynamique du manteau. La structure du manteau supérieur a été étudiée à l'échelle de la région en réalisant un modèle 3-D de la vitesse des ondes S par tomographie télésismique en ondes de surface. Les résolutions latérale (

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Paridis, Kyriakos Costas. "The inverse conductivity problem : anisotropy, finite elements and resistor networks." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-inverse-conductivity-problem-anisotropy-finite-elements-and-resistor-networks(db58b164-9b6e-45f3-b4b9-4f5935c40e48).html.

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EIT is a method of imaging that exists for a century, initially in geophysics and in recent years in medical imaging. Even though the practical applications of EIT go back to the early 20th century the systematic study of the inverse conductivity problem started in the late 1970s, hence many aspects of the problem remain unexplored. In the study of the inverse conductivity problem usually Finite Element Models are used since they can be easily adapted for bodies of irregular shapes. In this work though we use an equivalent approximation, the electrical resistor network, for which many uniquene

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Burr, Alexis. "Investigation of pore closure during polar firn densification." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI089/document.

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.La densification du névé en glace est un processus essentiel à comprendre pour interpréter les enregistrements climatiques. Une bonne connaissance des mécanismes permet une datation précise de l'air capturé dans la glace lors de la fermeture des pores. Celle-ci est plus vieille que l'air capturé à cause du transport des gaz dans la colonne de névé plus rapide que la densification de celui-ci. Cette différence d'âge entre la glace et le gaz est généralement appelé le Δage. La densification de la neige consiste en un processus complexe de réarrangement de grains, de frittage et de déformation v

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Estève, Clément. "Evolution and Tectonics of the Lithosphere in Northwestern Canada." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41097.

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The lithosphere of northwestern Canada recorded more than 2.5 Gy of complex tectonic evolution, from the formation of the ancient cores of the continental lithosphere such as the Slave craton to the Phanerozoic Cordilleran orogeny with substantial variations in crust and upper mantle structures that led to the concentration of natural resources (i.e., diamonds in cratons). Present-day northwestern Canada juxtaposes a thin and hot Cordilleran lithosphere to the thick and cold cratonic lithosphere, which has important implications for regional geodynamics. Recently, seismic station coverag

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VanderBeek, Brandon. "New Perspectives on Mid-Ocean Ridge Magmatic Systems and Deformation in the Uppermost Oceanic Mantle from Active- and Passive-Source Seismic Imaging in Cascadia." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24205.

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In this dissertation, I use seismic imaging methods to constrain the evolution of the oceanic upper mantle across the Juan de Fuca (JdF) and Gorda plates. This work begins by studying the geometry of the mantle magmatic system and patterns of mantle flow beneath the northern JdF ridge in relation to ridge-parallel changes in accretionary processes. I find that the dynamics of lithospheric rifting exert the primary control on the distribution of shallow mantle melts and variations in crustal thickness and composition. The orientation of mantle divergence beneath the JdF ridge, as inferred from

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Livres sur le sujet "Tomography and anisotropy"

J, Mezcua, and Carreño E, eds. Iberian lithosphere heterogeneity and anisotropy, ILIHA. Instituto Geográfico Nacional, 1993.

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Lin, Yu-Pin. Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5068-8.

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Lin, Yu-Pin. Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer, 2019.

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Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer, 2017.

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Chapitres de livres sur le sujet "Tomography and anisotropy"

Lin, Yu-Pin. "Full-Wave Multiscale Anisotropy Tomography in Southern California." In Isotropic and Anisotropic Seismic Tomography Using Active Source and Earthquake Records. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5068-8_5.

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Creager, Kenneth C. "Inner core anisotropy and rotation." In Earth's Deep Interior: Mineral Physics and Tomography From the Atomic to the Global Scale. American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0089.

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Rørvik, Stein, and Lorentz Petter Lossius. "Measurement of Anode Anisotropy by Micro X-Ray Computed Tomography." In Light Metals 2019. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05864-7_159.

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Kendall, J.-M. "Seismic anisotropy in the boundary layers of the mantle." In Earth's Deep Interior: Mineral Physics and Tomography From the Atomic to the Global Scale. American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0133.

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Mainprice, D., G. Barruol, and W. Ben Ismaïl. "The Seismic anisotropy of the Earth's mantle: From single crystal to polycrystal." In Earth's Deep Interior: Mineral Physics and Tomography From the Atomic to the Global Scale. American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0237.

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Moreno, Rodrigo, Magnus Borga, Eva Klintström, Torkel Brismar, and Örjan Smedby. "Anisotropy Estimation of Trabecular Bone in Gray-Scale: Comparison Between Cone Beam and Micro Computed Tomography Data." In Lecture Notes in Computational Vision and Biomechanics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13407-9_13.

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Forte, Alessandro M. "Seismic-geodynamic constraints on mantle flow: Implications for layered convection, mantle viscosity, and seismic anisotropy in the deep mantle." In Earth's Deep Interior: Mineral Physics and Tomography From the Atomic to the Global Scale. American Geophysical Union, 2000. http://dx.doi.org/10.1029/gm117p0003.

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Chandran, Vimal, Philippe Zysset, and Mauricio Reyes. "Prediction of Trabecular Bone Anisotropy from Quantitative Computed Tomography Using Supervised Learning and a Novel Morphometric Feature Descriptor." In Lecture Notes in Computer Science. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24553-9_76.

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Jansen, D. P., T. Chow, D. A. Hutchins, and R. P. Young. "Ultrasonic Tomographic Imaging of Anisotropic Solids." In Acoustical Imaging. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3370-2_10.

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Bodin, Thomas, Yann Capdeville, Barbara Romanowicz, and Jean-Paul Montagner. "Interpreting Radial Anisotropy in Global and Regional Tomographic Models." In The Earth's Heterogeneous Mantle. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15627-9_4.

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Actes de conférences sur le sujet "Tomography and anisotropy"

Pini, Ernesto, Danila Di Meo, Irene Costantini, et al. "Experimental evidence for anisotropic diffusion of light in white matter tissue." In Optical Tomography and Spectroscopy of Tissue XVI, edited by Sergio Fantini and Paola Taroni. SPIE, 2025. https://doi.org/10.1117/12.3042718.

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Korta Martiartu, Naiara, Saule Simute, Christian Boehm, et al. "Speed-of-sound anisotropy estimation using reflector-based pulse-echo ultrasound." In Ultrasonic Imaging and Tomography, edited by Nicole V. Ruiter and Brett C. Byram. SPIE, 2021. http://dx.doi.org/10.1117/12.2580952.

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Kirby, Mitchell A., Peijun Tang, Maju Kuriakose, et al. "Probing Elastic Anisotropy in Human Skin in vivo with Acoustic micro-tapping OCE and Polarization-sensitive OCT." In Optical Coherence Tomography. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/oct.2022.cs4e.3.

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Rudling, C. J., A. Riaz, and J. Smith. "Azimuthal Anisotropy Resolved By Tilted Orthorhombic Tomography." In First EAGE/PESGB Workshop on Velocities. EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800002.

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Stekl, I., A. Umpleby, and M. Warner. "Seismic anisotropy effects in 3D wavefield tomography." In 72nd EAGE Conference and Exhibition - Workshops and Fieldtrips. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609.20149940.

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Rao, Y., and Y. H. Wang. "Crosshole Seismic Tomography Including the Anisotropy Effect." In 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011. EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20149052.

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Xu, Shiqi, Xiang Dai, Xi Yang, et al. "Anisotropic intensity diffraction tomography." In Computational Optical Sensing and Imaging. Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cosi.2023.cm3b.2.

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We present a new non-scanning technique to reconstruct tomographic permittivity metrics of anisotropy samples from polarized intensity measurements. We apply the method to image both calibration targets and 3D tissue samples.

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Unnikrishnan, Ginu U., Glenn D. Barest, David B. Berry, Amira I. Hussein, and Elise F. Morgan. "Influence of Specimen-Specific Trabecular Anisotropy on QCT-Based Finite Element Analyses of Lumbar Vertebra." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80114.

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Quantitative computed tomography (QCT)-based finite element (FE) models provide better predictions of vertebral strength compared to traditional methods currently used in clinical diagnosis [1]. In QCT-based FE models, the intra- and inter-specimen variations in trabecular anisotropy are often ignored, despite evidence that the biomechanical behavior of the vertebra depends on the architecture of the vertebral trabecular bone [2]. A realistic representation of the specimen-specific, trabecular anisotropy in the FE models of vertebrae would potentially improve predictions of vertebral failure.

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Soloviev, A. P., M. I. Perchenko, and O. V. Zyuryukina. "Effect of scattering anisotropy on acoustooptic tomography signal." In Saratov Fall Meeting and Workshop on Laser Physics and Photonics 2012, edited by Valery V. Tuchin, Elina A. Genina, Vladimir L. Derbov, and Igor V. Meglinski. SPIE, 2013. http://dx.doi.org/10.1117/12.2018942.

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Breckon. "The Problem of Anisotropy in Electrical Impedance Tomography." In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.590118.

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Rapports d'organisations sur le sujet "Tomography and anisotropy"

Bauer, K., C. Haberland, R. G. Pratt, F. Hou, B E Medioli, and M. H. Weber. Ray-based cross-well tomography for P-wave velocity, anisotropy, and attenuation structure around the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220883.

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