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  • PACS. 21.60.Ev Collective models – 21.60.Jz Hartree-Fock and random-phase approximations – 21.10.Re Collective levels and giant resonances – 21.10.Ky Static electromagnetic moments  (1)
  • Weichgewebesimulation  (1)
  • 2000-2004  (2)
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  • 2000-2004  (2)
Year
  • 1
    ISSN: 1434-3940
    Keywords: Schlüsselwörter ; Dysgnathiechirurgie ; Operationssimulation ; Weichgewebesimulation ; Computersimulation ; Keywords ; Orthognathic surgery ; Preoperative planning ; Soft tissue simulation ; Computer-aided simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Background In addition to standard X-rays, photographic documentation, cephalometric and model analysis, a computer-aided, three-dimensional (3D) simulation system has been developed in close cooperation with the Institute of Communications of the Friedrich-Alexander-Universität Erlangen-Nürnberg. With this simulation system a photorealistic prediction of the expected soft tissue changes can be made. Prerequisites are a 3D reconstruction of the facial skeleton and a 3D laser scan of the face. After data reduction, the two data sets can be matched. Cutting planes enable the transposition of bony segments. The laser scan of the facial surface is combined with the underlying bone via a five-layered soft tissue model to convert bone movements on the soft tissue cover realistically. Conclusion Further research is necessary to replace the virtual subcutaneous soft tissue model by correct, topographic tissue anatomy.
    Notes: Hintergrund Im Rahmen eines Sonderforschungsbereichs der Deutschen Forschungsgemeinschaft (SFB 603) wurde in Zusammenarbeit mit dem Lehrstuhl für Nachrichtentechnik der Universität Erlangen-Nürnberg ein computergestütztes Simulationssystem zur dreidimensionalen, fotorealistischen Vorhersage von Weichgewebeveränderungen nach orthognathen Eingriffen entwickelt. Voraussetzung sind 3D-CT-Datensätze des Gesichtsschädels sowie eine ebenfalls dreidimensionale Laserabtastung der Gesichtsoberfläche. Beide Datensätze können nach Datenreduktion über ein mathematisches Verfahren so miteinander verknüpft werden, dass mit Hilfe so genannter “cutting planes” Verlagerungen von Knochensegmenten auf das bedeckende Weichgewebe realitätsnah übertragen werden können. Schlussfolgerung Es bedarf weiterer Forschungsanstrengungen, um auch die subkutanen Weichgewebelagen so in das Simulationsmodell zu integrieren, dass noch bestehende Abweichungen korrigiert werden können.
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  • 2
    ISSN: 1434-601X
    Keywords: PACS. 21.60.Ev Collective models – 21.60.Jz Hartree-Fock and random-phase approximations – 21.10.Re Collective levels and giant resonances – 21.10.Ky Static electromagnetic moments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The isospin dependence of shell closure phenomena is studied for light neutron-rich nuclei within a microscopic self-consistent approach using the Gogny force. Introducing configuration mixing, 32Mg is found to be dynamically deformed, although the N = 20 spherical shell closure persists at the mean-field level for all N = 20 isotones. In contrast, the N = 28 spherical shell closure is found to disappear for N - Z≥ 10 whereas deformed shell closures are preserved and lead to shape coexistence in 44 S. Configuration mixing shows that the ground state of this nucleus is triaxially deformed. The first 2+ excitation energy Ex = 1.46 MeV and the reduced transition probability B(E2;0+ gs→ 2+ 1)= 420 e 2 fm 4 obtained with our approach are in good agreement with experimental data.
    Type of Medium: Electronic Resource
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