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  • Key words: Magnetic resonance imaging (MRI)—Liver—Hepatocellular carcinoma—Percutaneous ethanol injection therapy—Parenchymal damage.  (1)
  • Key words: Radionuclide imaging – Ventilation – Bronchiectasis – Lung – Adenovirus – Childhood  (1)
  • mixing rule  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Fan-shaped hepatic parenchymal damage after ethanol injection therapy for hepatocellular carcinoma: MRI appearances (1999)
    Springer
    Abdominal imaging 24 (1999), S. 56-60 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Magnetic resonance imaging (MRI)—Liver—Hepatocellular carcinoma—Percutaneous ethanol injection therapy—Parenchymal damage.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: T1- and T2-weighted magnetic resonance (MR) images frequently show fan-shaped areas of hypo- or hyperintensity in the hepatic parenchyma adjacent to a treated hepatocellular carcinoma after percutaneous ethanol injection (PEI) therapy. These areas correspond to abnormal contrast enhancement on serial dynamic MR images. The purpose of the present study was to describe the location, appearance, and frequency of these abnormalities because it is important to understand these entities for the correct assessment of therapeutic efficacy. Methods: MR imaging including a multisection dynamic study was performed in 20 consecutive patients with hepatocellular carcinoma treated with PEI therapy. We retrospectively evaluated the presence of fan-shaped hypointensities adjacent to treated tumors in the liver parenchyma on T1-weighted images and hyperintensities on T2-weighted images and corresponding fan-shaped contrast enhancement on both arterial-dominant and delayed-phase dynamic MR images. We review the location, appearance, and frequency of these findings, and we discuss the possible causes on the basis of pathologic examinations. Results: Seven (35%) of the 20 patients showed fan-shaped hyperintense areas adjacent to the treated tumors on T2-weighted images. These areas showed isointensity in five patients and hypointensity in two patients on T1-weighted images. Of these seven patients, one (14%) underwent the MR imaging within 1 month after the completion of PEI therapy, and six (86%) had it 2–9 months after the completion of PEI therapy (mean = 6 months). In all seven patients, fan-shaped hyperperfusion abnormalities corresponding to these areas of hyperintensity on T2-weighted images were seen on both arterial-dominant and delayed-phase dynamic MR images. Pathologically, the coagulative necrosis of the hepatocytes with sinusoidal dilatation and the restoration by the development of fibrous tissue were seen in these fan-shaped areas. Conclusion: The fan-shaped areas of abnormal intensity on T1- and T2-weighted images and contrast enhancement on dynamic MR images seem to be attributable to pathologic changes in the normal liver parenchyma induced by the toxic reaction of ethanol. Awareness of the occurrence of such abnormalities in the peripheral liver parenchyma adjacent to the treated tumor is important for the correct assessment of therapeutic efficacy. RID=""ID=""〈e5〉Correspondence to:〈/e5〉 T. Fujita
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900440
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  • 2
    Electronic Resource
    Electronic Resource
    Irreversible long-term pulmonary functional impairments after adenovirus type-7 pneumonia: assessment with xenon-133 ventilation and Tc-99-m MAA perfusion studies (2000)
    Springer
    European radiology 10 (2000), S. 1411-1415 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Radionuclide imaging – Ventilation – Bronchiectasis – Lung – Adenovirus – Childhood
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A 3-year-old child presented with severe type-7 adenoviral pneumonia, after the resolution of diffuse pulmonary infiltrates of the pneumonia. Xenon-133 ventilation and Tc-99-m macroaggregated albumin (MAA) perfusion studies revealed a localized airflow obstruction and matched perfusion defect, and marked air trapping in the remaining lungs, and these abnormalities were not detected and not suspected even with CT. Thereafter, in a relatively short period, the child developed persistent bronchiectatic changes and pulmonary hyperinflation throughout the lungs. However, the scintigraphic findings were not significantly changed. This is the first description of radionuclide scintigraphic findings which clearly showed an irreversible long-term functional effect of adenoviral pneumonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300000431
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the thermal conductivity of xenon-helium mixtures at high temperatures by the shock-tube method (1992)
    Springer
    International journal of thermophysics 13 (1992), S. 211-221 
    Details
    ISSN: 1572-9567
    Keywords: corresponding states ; high temperatures ; mixing rule ; shock-tube method ; thermal conductivity ; xenon-helium mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of gases at high temperatures has been measured by the shock-tube method, which is uniquely suited to measure thermal conductivities of gases at high temperatures above 2000 K. A consistent set of thermal-conductivity data over a wide range of temperatures has been obtained from optimum combinations of shock-tube experiments at high temperatures, previously published data at lower temperatures, and a theoretical correlation of the temperature dependence. In the present study, the thermal conductivity of xenon-helium mixtures has been determined at compositions of 10 and 30 mol% xenon over the temperature range from 300 to 4800 K. Even though there is a large difference between the thermal conductivity of pure xenon and that of helium, it is interesting that the dependences of the thermal conductivity of the mixture on temperature and composition are linear. The experimental results are in good agreement with the predicted values based on the corresponding-states principle and the mixing rule. From these experimental results, interpolating the corresponding-states correlation data, we represent the equation of xenon-helium gas mixtures for thermal conductivity in terms of temperature and composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504432
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    Paper (German National Licenses)
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