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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 227 (1979), S. 241-260 
    ISSN: 1433-8491
    Keywords: Meningiomas ; Superselective angiography ; Tumor embolization ; Localization ; Vascularization ; Meningeome ; Superselektive Angiographie ; Embolisation ; Tumorlokalisation ; Tumorvascularisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 21 Patienten mit Meningeomen verschiedener Lokalisation und Größe werden unterschiedliche Embolisationstechniken und die Ergebnisse von insgesamt 25 präoperativen Tumorembolisationen beschrieben. Transfemorale Katheterisierungsmethoden waren dabei wegen der besseren Manipulierbarkeit der Katheter, der erzielbaren angiographischen Superselektivität und entsprechend exakteren Plazierung der Emboli direkten Techniken mit Punktion der Carotiden überlegen. Die Embolisationsresultate zeigten eine deutliche Abhängigkeit von der Meningeomlokalisation, wobei sich Konvexitätsmeningeome (6 Patienten) als besonders geeignet für eine vollständige Embolisation erwiesen. Bei Meningeomen der Falx mit größerer parasagittaler Ausdehnung, des lateralen Keilbeinflügels, der Sylvischen Fissur und des Cavum Meckeli (9 Patienten) waren operativ wie histologisch noch gute Embolisationseffekte nachweisbar. Dagegen waren Embolisationen bei ausschließlicher Tumorlokalisation an der Falx oder dem Tentorium sowie bei überwiegend internaversorgten Keilbeinflügelmeningeomen ohne therapeutischen Effekt. Bei Berücksichtigung der Tumorlokalisation und des Vascularisations-types sowie der Anwendung geeigneter superselektiver Angiographie- und Embolisationstechniken wird die präoperative Meningeomembolisation als wichtige Verbesserung der operativen Ausgangsbedingungen angesehen.
    Notes: Summary The different techniques and results are described for a total of 25 preoperative tumor embolizations in 21 patients with meningiomas of diverse localizations and extents. Transfemoral catheter techniques were superior to direct punctures of the carotid arteries because of the easier handling of the catheters, the better superselectivity of angiography, and, consequently, the more exact placement of the emboli. The results of the embolizations depended on the localization of the meningiomas. Meningiomas of the convexities (six patients) turned out to be particularly susceptible to complete embolizations. Satisfactory results were achieved operatively and histologically through embolization in meningiomas of the falx with large parasagittal expansion as well as in those of the lateral sphenoid wing, the sylvian fissure, and the cavum Meckeli (nine patients). Embolization of tumors which were localized exclusively at the falx, the tentorium, or of more medially situated meningiomas of the sphenoid wing were without beneficial effect, since these are predominantly vascularized by branches of the internal carotid arteries. Provided the localization and vascularization of a tumor are favourable, the application of superselective angiography and preoperative embolization represents an important improvement of the basic conditions for a later operation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In two comparable groups of 12 adult rats at a time, the normal anatomy of the cerebral arteries and the pathologic vascular pattern of experimentally induced brain tumors was investigated angiographically. These tumors were malignant mixed gliomas which were inoculated by percutaneous puncture through the vault with a suspension of 10,000 tumor cells. The neuroradiologic examinations consisted of selective angiographies of the internal carotid artery in vivo, postmortem radiographies of cerebrovascular casts of isolated brains as well as of microangiographic and comparative histologic investigations of the tumor. The juxtaventricular localization and the extension of the tumors in the basal ganglia could be angiographically demonstrated approximately 3 to 4 weeks after the implantation of the tumor cells. Moreover, qualitative and quantitative vascular criteria of malignancy could be shown microangiographically which correlated well with the histologic findings. The effects of several therapeutic procedures such as radiotherapy, pharmacoangiography and various techniques of embolization are being studied with this experimental tumor model in order to explore the prerequisites for appropriate treatment of cerebral lesions in man.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 15 (1978), S. 221-224 
    ISSN: 1432-1920
    Keywords: Plexiform neurofibroma ; Cauda equina tumors ; Spinal angiography ; Myelography ; Rankenneurofibrom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The clinical and neuroradiological findings in a rare case of plexiform neurofibroma with bone scintigraphy, myelography and selective spinal angiography are described. The difficulties with the preoperative differential diagnosis from other intraspinal space occupying lesions are discussed and the importance of intraoperative biopsy and electrical stimulation is stressed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 282 (1977), S. 353-358 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using gaseous sources of Tc2O7 containing the radioactive isotopes94Tc,95Tc and96Tc, levels at 871.0keV (94Mo), 765.8, 820.6, 947.8, 1074.0keV (95Mo) and 778.3keV (96Mo) have been excited. From the effective cross sections for nuclear resonance scattering and from the lifetimes of the 947.8, 1074.0 and 778.3keV levels known from Coulomb excitation experiments the profiles of theγ-lines have been determined. A broadening of theγ-lines due to Coulomb explosion of the molecules has been observed. Making use of the line profiles, lifetimes ofΤ=(6.4±1.0) ps andΤ=(0.90 ± 0.20) ps have been determined for the 765.8 and 820.6keV levels, respectively. The angular distribution of the resonantly scattered radiation yields an amplitude ratioδ for the mixed M1 E2 765.8keV transition ofδ=0.14 −0.009 +0.08 . TheB(E2) from a Coulomb excitation experiment and the lifetimeΤ from the present experiment yield ¦δ¦=0.07±0.01 for the 820.6keV transition.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 279 (1976), S. 19-25 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using gaseous sources of I2 and HI containing the radioactive isotopes124I and126I effective cross sections for nuclear resonance scattering from the first 2+ states of124Te and126Te were measured. Information is obtained about the charging of the nonradioactive molecular partner afterEC decay, the interaction of highly charged ions with neutral molecules, and the slowing down of atoms in a Xe buffer gas. Indications of an iodine complex being stable in the gaseous phase are found.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 283 (1977), S. 15-19 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for Rayleigh scattering of 59.54 keV photons by Zn, Mo, Sn, Ta, Au and Pb have been measured for angles ranging from 60° to 150°. The results are in an overall agreement with the predictions of second-order perturbation theory within the experimental error of about 4%. A comparison with the form factor approximation reveals pronounced dispersion effects at photon energies close to theK-shell binding energies. The agreement with the predictions of the dispersion theory is only of the order of 10% with discrepancies up to 25%.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 288 (1978), S. 119-123 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for the elastic scattering of 2.754 MeV photons by Ta have been measured for angles ranging from 30° to 150°. A comparison with lowest-order Delbrück theory reveals discrepancies of the same size as previously observed for Pb and Bi. Consideration is given to interference phenomena between Delbrück, Rayleigh and nuclear Thomson scattering.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 272 (1975), S. 197-202 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a gaseous H2 75Se source at low pressure the perturbed directional correlation of the 121–279 keVγγ cascade of75As was measured as a function of an external magnetic field. The anisotropy shows a pronounced resonance behaviour around zero field. This effect may be understood as being due to the hyperfine interaction of the nucleus with the electronic shell of the highly charged ion formed after electron capture. The charge distribution of the As ions was estimated and the spin distribution derived from it. Then a comparison with the theory of Leisi was possible giving a qualitative agreement between theory and experiment.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 293 (1979), S. 287-292 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for the elastic scattering of 2.754 MeV photons by Pu were measured for angles ranging from 45 to 120° and interpreted in terms of Delbrück, nuclear Thomson, Rayleigh and nuclear resonance scattering. It is shown that the largest part of the discrepancy between experiment and the lowest-order Delbrück theory can be removed by introducing a (Zα)4-dependent Coulomb correction term. Evidence is obtained for additional Coulomb correction terms of higher order in (Z α).
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Profiles of the 264.6 keVγ-line of75As emitted after the electron capture decay of75Se have been measured using nuclear resonance fluorescence in combination withγγ-coincidences as a high resolution, variable-energyγ spectrometer. The sources consisted of gaseous75SeH2 with different amounts of Kr or Xe. From the line profiles information has been obtained about the velocity distribution of the radioactive75As ions after electron capture decay and about the slowing down of the75As ions in the moderator gas. The75As ions obtain kinetic energies of up toW∼5 eV by neutrino recoil and Coulomb fragmentation of the75SeH2 molecules, corresponding to velocities of the order of 105 cm s−1. The slowing down of the75As ions has been interpreted in terms of the model of colliding elastic spheres, taking into account the thermalization in an exact way. No satisfactory agreement has been obtained between measured and calculated line profiles. This result indicates that inelastic processes are of great importance in the interaction of75As ions or atoms with the noble gas moderator atoms.
    Type of Medium: Electronic Resource
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