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  • 1
    Electronic Resource
    Electronic Resource
    The “dural tail” adjacent to meningiomas studied by dynamic contrast-enhanced MRI: a comparison with histopathology (1994)
    Springer
    Neuroradiology 36 (1994), S. 303-307 
    Details
    ISSN: 1432-1920
    Keywords: MRI ; Meningioma ; Dynamic contrast Enhancement ; Dural enhancement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined 32 patients with intracranial tumors (17 meningiomas, 8 neuromas, 7 pituitary adenomas) by conventional and dynamic contrast-enhanced MRI. Our aim was to clarify whether the pathological dural contrast enhancement adjacent to meningiomas (the “dural tail”) is specific to meningiomas and, more important, whether it represents neoplastic dural infiltration or hypervascularization as a tumor accompanying reaction. A “dural tail” was found in 9 of 17 meningiomas. None of the other extra-axial tumours (neuromas, pituitary adenomas) showed comparable dural enhancement. Dynamic examinations with an ultrafast single slice imaging technique (snapshot-FLASH) after a bolus injection of contrast medium showed a “dural tail” in seven out of these nine meningiomas, while in two cases the “dural tail” turned out to be a cortical vein with a characteristic dynamic contrast enhancement pattern. In the dynamic study all seven “dural tails” were found to have earlier, steeper contrast enhancement than the corresponding tumours. All the tumours and part of the adjacent dura mater in four of the seven meningiomas with dural enhancement were examined histopathologically. In none of these four cases was neoplastic tissue found more than 2 mm away from the main tumour. The results strongly support the suggestion that the “dural tail” adjacent to meningiomas represents a hypervascular, non-neoplastic dural reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593266
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cochlear responses to dynamic click patterns in the guinea pig (1981)
    Springer
    European archives of oto-rhino-laryngology and head & neck 230 (1981), S. 229-235 
    Details
    ISSN: 1434-4726
    Keywords: Cochlear adaptation ; Pattern stimulation ; Summed action potential ; Dynamical responses ; Rate sensitivity ; Inhibition ; Facilitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fast cochlear adaptation, expressed as percent inhibition of the summed action potential, is studied from the guinea pig cochlea responses to click trains, ramps, and steps in both directions. The transition time function of adaptation to constant click trains does not depend on click strength, but rather on click interval. On the background of steady state adaptation, click steps produce only transient changes of the adaptive state, opposite to step direction. Compared to constant train stimulation, adaptation is enhanced by descending click ramps, and diminished or reversed (near threshold) by ascending ramps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456323
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions of adaptation and masking in the guinea pig cochlea (1982)
    Springer
    European archives of oto-rhino-laryngology and head & neck 234 (1982), S. 197-202 
    Details
    ISSN: 1434-4726
    Keywords: Cochlear adaptation ; Pattern stimulation ; Preceding tone bursts ; Variable frequencies ; Delay time ; Additional adaptation ; Masking ; Summating potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fast cochlear adaptation and masking phenomena, expressed as percent inhibition of the summed action potential, are studied from the guinea pig cochlea responses to click trains and tone bursts given previously or simultaneously to the click sequence. After preceding tone bursts, the click responses are superposed by inhibitory aftereffects dependent on the tone frequency. With interposed tone bursts, the click sequence response is masked, dependent on tone frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453631
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    Paper (German National Licenses)
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