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  • Electronic Resource  (3)
  • Fluorescence  (1)
  • Key words: Liver — Tumors — Laparoscopy — Radiofrequency ablation — Hounsfield unit density  (1)
  • LB films  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Fluorescence study of a field-induced director reorientation in a liquid crystalline polyacrylate (1991)
    Springer
    Journal of fluorescence 1 (1991), S. 69-76 
    Details
    ISSN: 1573-4994
    Keywords: Fluorescence ; liquid crystals ; polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electric field-induced director reorientation is investigated by fluorescence spectroscopy and turbidimetry. The dynamics of this reorientation are studied as a function of temperature, applied voltage, and frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00865260
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Use of CT Hounsfield unit density to identify ablated tumor after laparoscopic radiofrequency ablation of hepatic tumorsrid=""id=""Presented at the annual meeting of the Society of American Gastrointestinal Endoscopic Surgeons (SAGES), Atlanta, Georgia, USA, 29 March–1 April 2000 (2000)
    Springer
    Surgical endoscopy and other interventional techniques 14 (2000), S. 799 -804 
    Details
    ISSN: 1432-2218
    Keywords: Key words: Liver — Tumors — Laparoscopy — Radiofrequency ablation — Hounsfield unit density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: When attempting to interpret CT scans after radiofrequency thermal ablation (RFA) of liver tumors, it is sometimes difficult to distinguish ablated from viable tumor tissue. Identification of the two types of tissue is specially problematic for lesions that are hypodense before ablation. The aim of this study was to determine whether quantitative Hounsfield unit (HU) density measurements can be used to document the lack of tumor perfusion and thereby identify ablated tissue. Methods: Liver spiral CT scans of 13 patients with 51 lesions undergoing laparoscopic RFA for metastatic liver tumors within a 2-year time period were reviewed. HU density of the lesions as well as normal liver were measured pre- and postoperatively in each CT phase (noncontrast, arterial, portovenous). Statistical analyses were performed using Student's paired t-test and ANOVA. Results: Normal liver parenchyma, which was used as a control, showed a similar increase with contrast injection in both pre- and postprocedure CT scans (56.4 ± 2.4 vs 57.1 ± 2.4 HU, respectively; p= 0.3). In contrast, ablated liver lesions showed a preablation increase of 45.7 ± 3.4 HU but only a minimal postablation increase of 6.6 ± 0.7 HU (p 〈 0.0001). This was true for highly vascular tumors (neuroendocrine) as well as hypovascular ones (adenocarcinoma). Conclusions: This is the first study to define quantitative radiological criteria using HU density for the evaluation of ablated tissues. A lack of increase in HU density with contrast injection indicates necrotic tissue, whereas perfused tissue shows an increase in HU density. This technique can be used in the evaluation of patients undergoing RFA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004640000236
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Langmuir-Blodgett deposition and second-order non-linear optics of several azobenzene dye polymers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 33-38 
    Details
    ISSN: 1057-9257
    Keywords: LB films ; non-linear optics ; azobenzene derivatives ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The Langmuir-Blodgett (LB) film-forming properties of a number of novel azobenzene dye polymers are reported. The linear and second-order non-linear optical properties of the films have been studied using ellipsometry, visible spectroscopy and Pockels effect measurements. As monolayers, the effective electro-optic r-coefficients ranged from 1 to 8.7 pm V.-1 When one of the polymers was combined in an alternate layer film (230 layers in total), an r13-coefficient of 13 pm V-1 was achieved. This is one of the highest values reported for a ‘thick’ LB film.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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