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  • 1995-1999  (2)
  • 79.20.DS  (1)
  • Eisenoxid  (1)
  • 1
    ISSN: 1432-0630
    Keywords: 79.20.DS ; 81.90. + c ; 78.90. + t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Interaction phenomena of 50 ns copper vapour laser pulses (λ = 511/578 nm) with matter are investigated. The basic ablation process is classified into four fundamental classes. On basis of this classification processing results are connected with specific material properties like the brittleness, the viscosity of the melt or the optical properties. Knowing these properties a prognosis of the expected fundamental process is possible. In order to generate a geometrically defined structure via ablation in a given material-specific process, strategies have to be developed. Typical examples for process strategies are given.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Magnetresonanztomographie ; Kontrastmittel ; Eisenoxid ; MION ; Glioblastom ; Key words Magnetic resonance imaging ; Contrast medium ; Iron oxide ; MION ; Glioblastoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Purpose: To investigate whether the margins of microscopic tumors can be delineated better with monocrystalline iron oxide nanoparticles (MION), a superparamagnetic contrast medium, than with Gd-DTPA by magnetic resonance imaging (MRI). Methods: MRI and histological examinations were conducted in 28 Wistar rats with sterotactically implanted gliomas (C6 gliomas). Of the 28 animals, 14 were examined after intravenous administration of MION [nine animals received 179 mmol Fe/kg body weight (dose 1), and five, 893 mmol Fe/kg (dose 2)]. The other 14 animals were examined first after i.v. administration of Gd-DTPA (0.2 mmol/ kg) and then after i.v. administration of MION. The extent of the tumors as seen on MRI and at histological study were compared. Results: Iron particles were identified microscopically in tumor cells and in the tumoral interstitium. After administration of MION at dose 1, the contrast-enhanced area of tumor was 1.55-fold greater than the extent of tumor identified by histological study, at dose 2, 2.15-fold. Compared with Gd-DTPA the area of contrast enhancement was greater by a factor of 1.38 with MION administration at dose 1 and by a factor of 1.91 at dose 2. Conclusion: MION provides intra- and extracellular contrast enhancement. The area of the contrast-enhanced tumor is dose-dependently greater with MION than with Gd-DTPA and also greater than the extent of tumor seen at histological study.
    Notes: Zusammenfassung Fragestellung: Verbessert ein superparamagnetisches Kontrastmittel (monocrystalline iron oxide nanoparticle, MION) die MR-tomographische Abgrenzbarkeit mikroskopischer Tumorgrenzen im Vergleich zu Gd-DTPA? Methodik: 28 Wistar-Ratten mit stereotaktisch implantiertem Gliom (C6-Gliom) wurden MR-tomographisch und mikroskopisch untersucht. 14 Tiere hiervon wurden nach intravenöser (i.v.) Gabe der MION untersucht [9 Tiere erhielten 179 μmol Fe/kg Körpergewicht (=Dosierung 1), 5 Tiere 893 μmol Fe/kg (=Dosierung 2)]. 14 Tiere wurden zuerst nach i.v. Gabe von Gd-DTPA (0,2 mmol/kg) und anschließend nach i.v. Gabe der MION untersucht. MR-tomographische und mikroskopische Tumorausdehnungen wurden verglichen. Ergebnisse: Eisenpartikel konnten mikroskopisch in Tumorzellen und im Tumorinterstitium nachgewiesen werden. Nach Gabe der MION in Dosierung 1 war die Ausdehnung des KM-anreichernden Areals in der MRT im Durchschnitt 1,55fach größer als der in der Histologie erkennbare Tumor, bei Dosierung 2 sogar 2,15fach. Im Vergleich mit Gd-DTPA war die KM-anreichernde Fläche nach Gabe der MION in Dosierung 1 um den Faktor 1,38 größer, in Dosierung 2 um den Faktor 1,91. Schlußfolgerungen: MION führen zu einer intra- und extrazellulären KM-Anreicherung. Die Ausdehnung des KM-anreichernden Areals ist dosisabhängig ausgedehnter als die KM-Anreicherung nach Gd-DTPA Gabe und auch ausgedehnter als die morphologisch nachweisbaren Tumorgrenzen.
    Type of Medium: Electronic Resource
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