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  • 3D-fast spin-echo  (1)
  • 81.40  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Mechanism of silicon implant-deposition for surface modification of stainless steel 304 using KrF-excimer laser (1995)
    Springer
    Applied physics 60 (1995), S. 41-47 
    Details
    ISSN: 1432-0630
    Keywords: 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Simultaneous implantation and deposition of Si by KrF-excimer-laser (248 nm) irradiation in an ambient silane (SiH4) gas realize the surface modification of stainless steel (SUS) 304 at room temperature. This process is referred to as the Laser Implant-Deposition (LID). Depth profiles of Si concentration in the modified layers and the total quantities of supplied Si (Si dose) are analyzed by Rurtherford Backscattering Spectroscopy (RBS) measurements. The Si supply mechanism of LID is discussed with variations of the Si dose as a function of laser fluence, gas pressure, and the number of laser pulses. The calculation of temperature along the depth during the LID process suggests that the Si atoms diffuse into the SUS304 in a liquid phase. Fitting of the calculated depth profile to the experimental data, using the interdiffusion theory, gives an interdiffusion coefficient between Si and SUS304 as high as ≈ 2.8×10−6 cm2/s. A simplified model for simulation, by which well agreed depth profiles of Si can be simulated for various experimental conditions, is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01577611
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution T2-weighted MR imaging of the inner ear using a long echo-train-length 3D fast spin-echo sequence (1996)
    Springer
    European radiology 6 (1996), S. 369-374 
    Details
    ISSN: 1432-1084
    Keywords: Ear ; MR ; 3D-fast spin-echo ; High resolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to assess the value of a long echo-train-length 3D fast spin-echo (3D-FSE) sequence in visualizing the inner ear structures. Ten normal ears and 50 patient ears were imaged on a 1.5T MR unit using a head coil. Axial high-resolution T2-weighted images of the inner ear and the internal auditory canal (IAC) were obtained in 15 min. In normal ears the reliability of the visualization for the inner ear structures was evaluated on original images and the targeted maximum intensity projection (MIP) images of the labyrinth. In ten normal ears, 3D surface display (3D) images were also created and compared with MIP images. On the original images the cochlear aqueduct, the vessels in the vicinity of the IAC, and more than three branches of the cranial nerves were visualized in the AIC in all the ears. The visibility of the endolympathic duct was 80%. On the MIP images the visibility of the three semicircular canals, anterior and posterior ampulla, and of more than two turns of the cochlea was 100%. The MIP images and 3D images were almost comparable. The visibility of the endolymphatic duct was 80% in normal ears and 0% in the affected ears of the patients with Meniere's disease (p 〈 0.01). In one patient ear a small intracanalicular tumor was depicted clearly. In conclusion, the long echo train length T2-weighted 3D-FSE sequence enables the detailed visualization of the tiny structures of the inner ear and the IAC within a clinically acceptable scan time. Furthermore, obtaining a high contrast between the soft/bony tissue and the cerebrospinal/endolymph/perilymph fluid would be of significant value in the diagnoses of the pathologic conditions around the labyrinth and the IAC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180615
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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