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  • 1
    Electronic Resource
    Electronic Resource
    Homogeneous enhancement of hepatic parenchyma: MR imaging during arterial portography versus CT during arterial portography (1998)
    Springer
    Abdominal imaging 23 (1998), S. 51-55 
    Details
    ISSN: 1432-0509
    Keywords: Key words: MR during arterial portography—CT during arterial portography—Liver—Gadolinium.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: The goal of this study was to investigate the frequency of inhomogeneous parenchymal enhancement of the liver in magnetic resonance imaging during arterial portography (MRAP) versus computed tomography during arterial portography (CTAP). Methods: CTAP and MRAP were performed in 29 and in 21 patients, respectively, who had suspected primary or secondary liver tumors on clinical or biological grounds. We evaluated the frequency of inhomogeneous hepatic parenchymal enhancement not related to a decrease of portal blood supply due to compression or obstruction by the tumor and physiologic variation in portal perfusion. Inhomogeneous parenchymal enhancement of the liver was classified as segmental or subsegmental and as nonsegmental. Results: Segmental or subsegmental inhomogeneous parenchymal enhancement was seen in six of 29 patients (20.1%) on CTAP and in one of 21 patients (4.8%) on MRAP. Nonsegmental inhomogeneous parenchymal enhancement was seen in five of 29 patients (17.2%) on CTAP images and in none of the patients (0%) on MRAP images. The incidence of nonsegmental inhomogeneous parenchymal enhancement was significantly lower on MRAP than on CTAP. Conclusion: MRAP was superior to CTAP in achieving homogeneous parenchymal enhancement of the liver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900284
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  • 2
    Electronic Resource
    Electronic Resource
    Saturation vapor pressure and critical constants of H2O, D2O, T2O, and their isotopic mixtures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 681-694 
    Details
    ISSN: 1572-9567
    Keywords: critical constants ; deuterium oxide ; heavy water ; isotope effect ; saturation vapor pressure ; tritium oxide ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Reliable data on the vapor pressure and critical constants of H2O isotopes and their isotopic mixtures are required for the generation of thermophysical properties data over a wide range of temperatures and pressures. In this study, vapor pressure equations for D2O and T2O have been developed based on the latest experimental and theoretical information. Considering the similarity among H2O isotopes, the functional form of the Saul and Wagner equation, fully proven for H2O, has been employed. The present equation for D2O shows a lower trend by up to 0.09% than the widely used Hill and MacMillan equation at temperatures below 150°C. For the vapor pressure of the isotopic mixtures, the available experimental data have been examined for the validity of Raoult's law. Then it has been shown that the critical temperature and the critical pressure of the isotopic mixture can also be predicted as simple mole-fraction average values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500788
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    Paper (German National Licenses)
    Fulltext
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