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  • 1
    Electronic Resource
    Electronic Resource
    Gas-discharge XeF* (B→X) laser with high specific output energy (1994)
    Springer
    Applied physics 59 (1994), S. 533-535 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.By ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The discharge characteristics of the XeF* (B→X) laser are investigated. The NF3 and Xe partial pressure of the laser gas mixture and the total gas pressure have been varied. A highest specific output energy of 4.7 J/l with an efficiency of 0.5% was obtained from a X-ray preionized Ne/Xe/NF3 gas mixture at 6 bar with single-pulse excitation through a multichannel spark gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082396
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical and experimental investigation of a waveguide CO2 laser with radio-frequency excitation (1996)
    Springer
    Applied physics 62 (1996), S. 113-127 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 52.00 ; 34.80 ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comprehensive experimental and theoretical study of the optimization of a continuous-wave radiofrequency (rf) excited CO2 waveguide laser is presented. The numerical simulation includes the modelling of the gas-discharge plasma parameters like the plasma impedance and energy deposition, the laser kinetics and finally the influence of the resonator feedback on the lasing process. Along with this theoretical study, an extensive experimental research program enabled us to optimize the laser performance of the CO2 waveguide laser. As a result, a total output power of 42 W and a specific output power of 1.1 W/cm were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081112
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optimisation of the pulse duration of a discharge-pumped XeF(B→X) excimer laser (1995)
    Springer
    Applied physics 60 (1995), S. 553-556 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.By ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In an x-ray preionised XeF(B→X) discharge-excited laser driven by a magnetic-spiker sustainer circuit with a magnetic pulse compressor the influence of the various parameters on the optical pulse duration was experimentally investigated. Laser pulses at λ = 351 nm with a duration of 212 ns (FWHM) have been achieved in a NF3/Xe/Ne mixture by using very low (0.25 mbar) NF3 partial pressures in a total gas pressure of 2.5 bar and with a high-reflecting output coupling mirror.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080934
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Neue MR-Kontrastmittel in der Leberdiagnostik Erste klinische Ergebnisse mit hepatobiliärem Eovist® (Gadolinium-EOB-DTPA) und RES-spezifischem Resovist® (SH U 555 A) (1996)
    Springer
    Der Radiologe 36 (1996), S. 124-133 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Leber ; MRT ; Kontrastmittel ; Resovist® ; Eovist® ; Key words Liver ; MRI ; Contrast agents ; Resovist ; Eovist
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The purpose of this work is to describe our initial clinical experience (in 66 patients) with Resovist and Eovist, two new liver-specific MR contrast agents. We focus our report on safety aspects, dose finding, and optimization of technical parameters. Both contrast agents were well tolerated and improved the detectability of focal liver lesions. With Resovist, postcontrast MRI may be started as early as 10 min following injection. The dose of 8 μmol Fe/kg bodyweight was sufficient to achieve diagnostic tumor-liver contrast levels. Since Eovist can also be administered as a bolus, dynamic enhance- ment patterns may be studied for tumor characterization as well. Breath-hold T 1-weighted FLASH images were superior to other T 1-weighted techniques with and without fat saturation.
    Notes: Zusammenfassung In der vorliegenden Arbeit werden erste klinische Ergebnisse (66 Patienten) der für die Leberbildgebung entwickelten Kontrastmittel Resovist® und Eovist® vorgestellt. Es wurden Sicherheitsaspekte, Dosierungsfragen und die optimale Untersuchungstechnik am Beispiel fokaler Leberläsionen untersucht. Beide „leberspezifischen“ Kontrastmittel zeigten bei guter Verträglichkeit eine Verbesserung des Nachweises fokaler Leberläsionen. Die Untersuchung mit Resovist® kann bereits 10 min nach der Kontrastmittelinjektion erfolgen. Mit einer Dosis von 8 μmol Fe/kg Körpergewicht konnte eine ausreichender Tumor-Leber-Kontrast erzielt werden. Da Eovist® zusätzlich im Bolus injiziert werden kann, ergeben sich neben dem Nachweis fokaler Leberläsionen Möglichkeiten der Charakterisierung durch Analyse der Perfusionsmuster. Atemgehaltene T 1-gewichtete FLASH-Sequenzen waren sonstigen T 1-gewichteten Sequenzen ohne und mit Fettgesättigung überlegen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050049
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  • 5
    Electronic Resource
    Electronic Resource
    Erscheinungsformen der Mesenterialzyste Ein kasuistischer Beitrag (1996)
    Springer
    Der Radiologe 36 (1996), S. 503-507 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Mesenterialzyste ; Ultraschall ; CT ; MRT ; Key words Mesenteric cysts ; Ultrasound ; Computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Mesenteric cysts are considered as a rare cause of abdominal complaints. Histologically, several specific types can be distinguished: lymphangioma, nonpancreatic pseudocyst, enteric duplication cyst, enteric cyst and mesothelial cyst. Histopathological classification and radiological findings in two cases of mesenteric cysts are presented, and, with regard to the literature, radiological appearance and differential diagnoses are discussed.
    Notes: Zusammenfassung Mesenterialzysten stellen eine eher seltene Ursache abdomineller Beschwerden dar. Ihre derzeit gebräuchliche Einteilung unterscheidet zwischen Lymphangiom, nichtpankreatischer Pseudozyste, enteraler Duplikationszyste, enteraler Zyste und Mesothelialzyste. Anhand zweier Kasuistiken werden unter Berücksichtigung der Literatur histopathologische Klassifikation und Schnittbildbefunde der Mesenterialzyste dargestellt sowie die zugehörigen Differentialdiagnosen unter besonderer Berücksichtigung des jeweiligen Stellenwertes der Bildgebung diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050104
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    Paper (German National Licenses)
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