Relevant bibliographies by topics / Diffraction Constrast Tomography

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Diffraction Constrast Tomography'

Author: Grafiati
Published: 7 July 2024
Last updated: 31 July 2025

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Journal articles on the topic "Diffraction Constrast Tomography"

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Machnio, Piotr, Michał Ziemczonok, and Małgorzata Kujawińska. "Reconstruction enhancement via projection screening in holographic tomography." Photonics Letters of Poland 13, no. 2 (2021): 37. http://dx.doi.org/10.4302/plp.v13i2.1104.

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This paper presents an algorithm for automatic detection of erroneous amplitude and phase components of a sample’s optical field, acquired by a holographic tomograph with a limited angle of projection. By applying image processing methods and statistical analysis to find and remove unfit projections, the quality of tomographic reconstruction of a 3D refractive index distribution of an object is greatly improved. The proposed methods can find their application in preprocessing of data in holographic tomography. Full Text: PDF ReferencesA. Kuś, W. Krauze, P. L. Makowski, and M. Kujawińska, "Holo
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Krauze, Wojciech, Piotr Makowski, Małgorzata Kujawińska, and Arkadiusz Kuś. "Generalized total variation iterative constraint strategy in limited angle optical diffraction tomography." Optics Express 24, no. 5 (2016): 4924. http://dx.doi.org/10.1364/oe.24.004924.

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Costa, Jessé C., Francisco J. da Silva, Ellen N. Gomes, Jörg Schleicher, Luiz André Melo, and Daniela Amazonas. "Regularization in slope tomography." GEOPHYSICS 73, no. 5 (2008): VE39—VE47. http://dx.doi.org/10.1190/1.2967499.

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Seismic imaging in depth is limited by the accuracy of velocity model estimation. Slope tomography uses the slowness components and traveltimes of picked reflection or diffraction events for velocity model building. The unavoidable data incompleteness requires additional information to assure stability to inversion. One natural constraint for ray-based tomography is a smooth velocity model. We propose a new, reflection-angle-based kind of smoothness constraint as regularization in slope tomography and have compared its effects to three other, more conventional constraints. The effects of these
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Dickens, Thomas A. "Diffraction tomography for crosswell imaging of nearly layered media." GEOPHYSICS 59, no. 5 (1994): 694–706. http://dx.doi.org/10.1190/1.1443627.

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Diffraction tomography is a high‐resolution imaging technique applicable to the mapping of formation velocities away from the borehole, achieving a spatial resolution of better than one acoustic wavelength when used to image synthetic model data. However, traditional filtered back‐propagation diffraction tomography algorithms are based on weak‐scattering and constant‐background velocity assumptions, which limits their applicability to models of realistic structural complexity. Results are obtained using a new, computationally efficient single‐mode (P‐wave) diffraction tomography algorithm that
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Samuel, Varsha, Daniel Spence, Liam Farmer, Simon Godber, Keith Rogers, and Anthony Dicken. "Preliminary Assessment of Quantitative Phase Analysis from Focal Construct Tomography." NDT 3, no. 2 (2025): 13. https://doi.org/10.3390/ndt3020013.

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New methods for real-time materials phase identification based upon focal construct tomography (FCT) have been examined. Such quantitative assessment has significant potential in sectors where in-line analysis is required, including screening within aviation security. As a recent component of work programs developing FCT, its capability for accurate, quantitative analysis has been assessed for the first time. Diffraction signatures from mixed-phase materials were acquired from an energy-dispersive FCT system running under normal operational conditions. A calibration curve was constructed from
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Rekdal, Thorbjørn, and Durk J. Doornbos. "A modified form of diffraction tomography to image boundary structures." GEOPHYSICS 58, no. 8 (1993): 1136–47. http://dx.doi.org/10.1190/1.1443497.

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Wavefield extrapolation downward from the surface, as applied in migration and associated inversion methods, is a common procedure to image subsurface reflectors. These methods require adequate (i.e., extensive and unaliased) sampling of the surface wavefield. Seismic tomography on the other hand, relates parameters of the upward propagated wavefield to the diffracting image, and sampling requirements are less severe; it is usually the only option to image deep structures from sparse data. The ordinary form of ray tomography, however, imposes a severe smoothness constraint on the boundary; in
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Liang, Kaichao, Li Zhang, and Yuxiang Xing. "Reciprocal-FDK reconstruction for x-ray diffraction computed tomography." Physics in Medicine & Biology 67, no. 9 (2022): 095009. http://dx.doi.org/10.1088/1361-6560/ac5bf9.

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Abstract Objective. X-ray diffraction (XRD) technology uses x-ray small-angle scattering signal for material analysis, which is highly sensitive to material inter-molecular structure. To meet the high spatial resolution requirement in applications such as medical imaging, XRD computed tomography (XRDCT) has been proposed to provide XRD intensity with improved spatial resolution from point-wise XRD scan. In XRDCT, 2D spatial tomography corresponds to a 3D reconstruction problem with the third dimension being the XRD spectrum dimension, i.e. the momentum transfer dimension. Current works in the
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Fang, Haixing, Wolfgang Ludwig, and Pierre Lhuissier. "Implementation of grain mapping by diffraction contrast tomography on a conventional laboratory tomography setup with various detectors." Journal of Applied Crystallography 56, no. 3 (2023): 810–24. http://dx.doi.org/10.1107/s1600576723003874.

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Laboratory-based diffraction contrast tomography (LabDCT) is a novel technique used to resolve grain orientations and shapes in three dimensions at the micrometre scale using laboratory X-ray sources, allowing the user to overcome the constraint of limited access to synchrotron facilities. To foster the development of this technique, the implementation of LabDCT is illustrated in detail using a conventional laboratory-based X-ray tomography setup, and it is shown that such implementation is possible with the two most common types of detectors: CCD and flat panel. As a benchmark, LabDCT project
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Atakul-Özdemir, Ayse, Xander Warren, Peter G. Martin, et al. "X-ray nanotomography and electron backscatter diffraction demonstrate the crystalline, heterogeneous and impermeable nature of conodont white matter." Royal Society Open Science 8, no. 8 (2021): 202013. http://dx.doi.org/10.1098/rsos.202013.

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Conodont elements, microfossil remains of extinct primitive vertebrates, are commonly exploited as mineral archives of ocean chemistry, yielding fundamental insights into the palaeotemperature and chemical composition of past oceans. Geochemical assays have been traditionally focused on the so-called lamellar and white matter crown tissues; however, the porosity and crystallographic nature of the white matter and its inferred permeability are disputed, raising concerns over its suitability as a geochemical archive. Here, we constrain the characteristics of this tissue and address conflicting i
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Perotti, Giulia, Henning O. Sørensen, Henning Haack, et al. "Thermal History of Matrix Forsterite Grains from Murchison Based on High-resolution Tomography." Astrophysical Journal 922, no. 2 (2021): 256. http://dx.doi.org/10.3847/1538-4357/ac26bc.

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Abstract Protoplanetary disks are dust- and gas-rich structures surrounding protostars. Depending on the distance from the protostar, this dust is thermally processed to different degrees and accreted to form bodies of varying chemical compositions. The primordial accretion processes occurring in the early protoplanetary disk such as chondrule formation and metal segregation are not well understood. One way to constrain them is to study the morphology and composition of forsteritic grains from the matrix of carbonaceous chondrites. Here, we present high-resolution ptychographic X-ray nanotomog
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Dissertations / Theses on the topic "Diffraction Constrast Tomography"

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Ribart, Clément. "Essais 4D multimodaux et simulations numériques appliqués à l'étude de la plasticité cristalline." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLM001.

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Comprendre les liens étroits entre microstructure et propriétés est un objectif majeur pour la conception de matériaux de structure. Les métaux présentent une organisation polycristalline hétérogène qui pilote leur performance, d’où la nécessité d’accéder aux quantités mécaniques d’intérêt à l’échelle granulaire, voire intragranulaire. Un large éventail de techniques de caractérisation permet désormais d’observer ces échelles. Des avancées récentes sur les techniques RX, en synchrotron ou en laboratoire, ont contribué à l’essor des expériences multimodales, notamment par la réalisation d’essai
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Book chapters on the topic "Diffraction Constrast Tomography"

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Marks II, Robert J. "Signal and Image Synthesis: Alternating Projections Onto Convex Sets." In Handbook of Fourier Analysis & Its Applications. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780195335927.003.0016.

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Alternating projections onto convex sets (POCS) [319, 918, 1324, 1333] is a powerful tool for signal and image restoration and synthesis. The desirable properties of a reconstructed signal may be defined by a convex set of constraint parameters. Iteratively projecting onto these convex constraint sets can result in a signal which contains all desired properties. Convex signal sets are frequently encountered in practice and include the sets of bandlimited signals, duration limited signals, causal signals, signals that are the same (e.g., zero) on some given interval, bounded signals, signals of
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Conference papers on the topic "Diffraction Constrast Tomography"

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Kujawinska, Malgorzata, Arkadiusz Kus, Wojciech Krauze, and Tomasz Lekszycki. "Limited angle optical diffraction tomography with generalized total variation iterative constraint algorithm." In Digital Holography and Three-Dimensional Imaging. OSA, 2016. http://dx.doi.org/10.1364/dh.2016.dw2h.1.

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Mittleman, Daniel M. "Terahertz Imaging: A New Technique for Inspection of Dielectric Materials." In ISTFA 1999. ASM International, 1999. http://dx.doi.org/10.31399/asm.cp.istfa1999p0003.

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Abstract Terahertz time-domain spectroscopy (THz-TDS) is a promising new technology which provides a relatively simple means of generating and detecting single-cycle pulses of far-infrared (or terahertz) radiation. One of the most interesting aspects of this system is its insensitivity to the thermal background. This obviates the need for cryogenic apparatus; as a result, this may be the first portable far-infrared spectrometer. Recent work has demonstrated the possibility of tomographic imaging using THz-TDS. In this imaging mode, a reflected pulse train is used to construct a three-dimension
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