tomography Articles

  • Recognition of karst structure using refraction tomography

    The results of location of karst wells and probable hydraulic connections between them in limestone massif using the refraction tomography are presented. Seismic modeling was based on refraction horizon recognition in the first stage and tomographic processing of P-wave and S-wave velocity changes in the second one. The studies were carried out on the terrain neighboring to the wall of abandoned ...


    By GEOSPECTRUM S.C.

  • Geotechnical Tomography: The Effects of Diffraction

    Tomographic imaging is the inversion of a field parameter using boundary observations. Current techniques make different simplifying hypotheses. In geotechnical tomography the straight ray assumption is most common. Problems arise when the wavelength is of the same order of magnitude as the size of the inclusion. In this case, the physics of diffraction creates significant effects behind the ...


    By ASTM International

  • Down-hole tomography

    This is a collection of various cases where the 2D resistivity imaging method pioneered by Advanced Geosciences Inc have been successfully applied. Click on a section below and you will be shown a full 2D resistivity imaging brochure detailing the ...


    By Advanced Geosciences, Inc.

  • Single-particle analysis and electron tomography

    Both single-particle analysis and electron tomography are special tools for the structural analysis of biological components by transmission electron microscopy. Single-particle analysis enables us to determine the structures of relatively large proteins and macromolecular complexes without crystallisation. Electron tomography is often used to visualise organelles and subcellular structures at ...


    By Inderscience Publishers

  • Down-hole tomography case study

    This is a collection of various cases where the 2D resistivity imaging method pioneered by Advanced Geosciences Inc have been successfully applied. Click on a section below and you will be shown a full 2D resistivity imaging brochure detailing the case in question. Acknowledgement: These cases have been submitted by satisfied customers whom we thank for permission to publish their data on the ...

  • A Sound Projector for Acoustic Tomography and Global Ocean Monitoring

    Abstract—Long-range underwater acoustic systems, such as those used in ocean acoustic tomography, require low-frequency signals covering a broad frequency band. To meet this requirement, a novel design based on of a tunable narrow-band high-efficiency sound projector has been exploited. The projector transmits a frequency sweep signal by mechanically tuning a resonator tube (or organ pipe) ...

  • Mapping exploitable gravel layers with Electrical Resistivity Tomography

    Geoelectrical measurements in a gravel pit were used to map exploitable gravel layers, to estimate their thickness and measure the overburden. 9 profiles with a length between 235 and 715m have been measured. The maximum penetration depth was about 45m. Visualizations on maps and in 3D fence diagrams show the distribution of the mineable gravel layers and simplify the planning of the ...


    By Geo2X

  • Passive Seismic Tomography Project in Papua, Indonesia - Case Study

    Passive Seismic Tomography Project Project Area: approximately 1000km2#11; (4700km2 with the peripheral stations) Seismic Network: 80 stations Recording Period: 5 months The scope of this project was the successful completion of a full Passive Seismic Tomography survey in Asmat – Papua, Indonesia, for subsurface mapping purposes and detection ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Project Phase II in Delvina, Albania - Case Study

    Passive Seismic Tomography Project Phase II Project Area: approximately 400km2 Seismic Network: 70 stations Recording Period: 11 months Number of Seismic Events located/used: 1200/1100 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey, was to provide accurate and reliable 3D P-wave velocity and ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Project Phase I in Assam, India - Case Study

    Passive Seismic Tomography Project Phase I Project Area: approximately 2000km2#11; Seismic Network: 36 stations Recording Period: 3 months Number of Seismic Events located/used: 116/108 The scope of this project was to provide coarse, but reliable 3D P-wave velocity and Vp/Vs models, adequate for a reconnaissance stage mapping of the study ...


    By SeismoTech Ltd

  • Atomic resolution analyses of nano-structured materials by atom probe tomography

    The three dimensional atom probe (3DAP) is a well established and widely used nanoanalysis tool in materials science (mainly metallic materials). Due to its ability to map out in 3D the distribution of atoms in the real space on a nearly atomic scale, it has been extensively applied for the investigation of a large variety of materials, allowing a better understanding of physical phenomena ...


    By Inderscience Publishers

  • Three–dimensional seismic tomography with tetrahedra element on isoparametric mapping

    The author has developed a method of three–dimensional seismic tomography on concrete structures. This method is based on ray–trace and identification technique, and the distribution of slowness or energy dissipation is identified based on simultaneously iterative reconstruction technique (SIRT) or the other kind of statistical identification technique. This kind of technique was originally ...


    By Inderscience Publishers

  • Passive Seismic Tomography Project Phase II in Assam, India - Case Study

    Passive Seismic Tomography Project Phase II Project Area: approximately 2000km2 Seismic Network: 76 stations Recording Period: 9 months Number of Seismic Events located/used: 276/263 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey in the same area, was to provide accurate and reliable 3D P-wave ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Feasibility Study in Aguacate, Mexico - Case Study

    Passive Seismic Tomography Feasibility Study Project Area: Approximately 2km2 Seismic Network: 5 stations Recording period: 12 days Seismotech’s personnel installed five seismic stations at the Aguacate hydrocarbon production area in Mexico, aiming to record the seismicity and evaluate the potential microseismic activity on this specific area. ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Project Phase I in Delvina, Albania Case Study

    Passive Seismic Tomography Project Phase I Project Area: approximately 900km2#11; Seismic Network: 50 stations Recording Period: 11 months Number of Seismic Events located/used: 2500/1860 The scope of this project was to provide coarse, but reliable 3D P-wave velocity and Vp/Vs models, adequate for a reconnaissance stage mapping of an area of ...


    By SeismoTech Ltd

  • Contaminant migration in unsaturated porous media using X-ray computerized tomography (CT)

    Landfills are usually located in unsaturated zones. Contaminant leaking can easily infiltrate groundwater through these porous media and contribute to groundwater pollution. The main objective of this work is to study the leachate migration in unsaturated porous media using X-ray computerized tomography (CT) and image-processing software. Silica sand and Yamazuna sand (collected from Japan) with ...


    By IWA Publishing

  • Integration & Joint Interpretation of Passive Seismic Tomography, Gravity and MT Data - Case Study

    Integration & Joint Interpretation of Passive Seismic Tomography, Gravity and MT Data The scope of this project was an integrated interpretation of the Passive Seismic Tomography, Gravity and Magnetotelluric data, acquired in the Delvina Gas field area in the context of the according geophysical surveys. Although the Delvina Gas field has a marginal production, the only ...


    By SeismoTech Ltd

  • Virtual 3D reconstruction, diagnosis and surgical planning with Mimics software

    CT scans interpretation is no longer strictly related to the machine. They can be analysed with specialised software that allows for diagnosis, surgical and dental procedures planning. So, medical doctors can analyse and determine the step–by–step procedure in the actual phase with a computer. There are presented some real examples computed with Mimics software. Keywords: CT scans, 3D ...


    By Inderscience Publishers

  • Electrical Method

    Vertical Electrical Soundings - Designed and performed vertical electrical soundings (VES) for proposed landfilling sites, utilizing an electrical resistivity system to determine depth to the water table. ADEQ project. Electrical Resistance Tomography - Participated in the Leak Detection Monitoring and Mitigation (LDMM) Project that utilized Electrical Resistance Tomography (ERT) developed by ...


    By ECA Geophysics

  • Low-dose radiation risk and the linear no-threshold model

    The Linear No-Threshold (LNT) model has been traditionally used in the field of radiation safety. Public attention to and debate on this model increased after estimates that current Computed Tomography (CT) procedures in the USA will ultimately be responsible for up to 2% of cancers. However, there is evidence that in the mGy range, low doses not only cause a relatively low probability of ...


    By Inderscience Publishers

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