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    Wyświetlanie 1-3 z 3
    Tytuł:
    Modeling of X-ray propagation in bone microstructure
    Autorzy:
    Binkowski, M.
    Król, Z.
    Wróbel, Z.
    Zeilhofer, H.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/333863.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    mikrotomografia
    mikrostruktury kości
    tłumienie promieniowania rentgenowskiego
    wizualizacja
    tomografia komputerowa
    erozja
    microtomography
    X-ray propagation
    bone microstructure
    attenuation of X-ray radiation
    visualization
    computed tomography
    erosion
    Opis:
    This paper presents some results concerning the analysis of X-ray propagation through biological structures. We introduce a physical model of the phenomenon and a numerical method based on this model for simulation of X-ray radiation propagation. The proposed method enables generation of radiological projections like those in the computed tomography or microtomography. We have focused our attention on the attenuation of X-ray radiation in bone tissue. Our computational model enables simulation of radiation propagation in the virtual specimen. The virtual bone microstructures used in our experiments are derived from the microtomography datasets of real bone specimens. The main advantage of our approach is that we can change the microstructure of the virtual sample in many ways by using the image processing methods. Results presented in this paper contain simulations of X-ray propagation for modified and unmodified trabecular microstructures as well as the visualization of the radiation intensity distribution for the simulated cases. With this new simulation technique, it is possible for example to analyze the propagation of X-ray radiation for different pathologic types of bone microstructure (e.g. virtually generated osteoporosis).
    Źródło:
    Journal of Medical Informatics & Technologies; 2005, 9; 75-82
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Photoelectron Emission Yield from Layered Structures in Presence of Resonance-Enhanced X-Ray Propagation Effect
    Autorzy:
    Pełka, J. B.
    Lagomarsino, S.
    Cedola, A.
    Di Fonzo, S.
    Jark, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963396.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.+g
    78.20.-e
    Opis:
    In this work we present the new experimental results of total photoelectric yield as well as energy distribution of photoelectrons excited in a thin carbon film deposited on Ni mirror in the presence of resonance-enhanced X-ray propagation effect. The measurements were performed using conventional X-ray tube as a radiation source for the energy Cu K$\text{}_{α}$ (8047 keV). The spectra were recorded using a flow proportional electron counter with energy resolution of about 15%, and multichannel pulse height analyzer. A comparison with the reflectivity spectra recorded at the same time show an excellent correlation of both kinds of spectra, consistently with the theoretical prediction. A map of electron energy distribution is reported. Although the applied electron counter was of low energetic resolution the recorded spectra show characteristic regularities and indicate that the photoelectron yield excited in the presence of resonance-enhanced X-ray propagation effect can provide depth dependent information about impurity distribution and processes in thin layers.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 851-857
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A high-accuracy method of computation of X-ray waves propagation through an optical system consisting many lenses
    Autorzy:
    Kshevetskii, S.
    Wojda, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938594.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    X-ray wave
    X-ray optic
    lens
    non-uniform medium
    focusing
    numerical method
    simulation
    finite differences
    stability
    numerical error
    wave phase
    electromagnetic wave
    fast oscillating function
    Opis:
    The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated mathematically and investigated. The presented results for equations show that in order to establish a high accuracy computation a much smaller number of points is needed to solve the problem of X-ray waves propagation through a multi-lens system when the method for the second equation is used. The reason for such a result is that the electric field of a wave after passing through many lenses is a quickly oscillating function of coordinates, while the electric field phase is a quickly increasing, but not oscillating function. Therefore, a very detailed difference grid, which is necessary to approximate the considered electric field can be replaced by not such a detailed grid, when computations are made for the complex wave of the electric field. The simulation error of both suggested methods is estimated. It is shown that the derived equation for a phase function allows efficient simulation of propagation of X-rays for the multi-lens optical system.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 171-186
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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