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  • 1
    Electronic Resource
    Electronic Resource
    Valence bands of poly(methylmethacrylate) and photoion emission in vacuum ultraviolet region (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5423-5428 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoion and photoelectron yields were measured for poly(methylmethacrylate) in the photon energy region of 8–40 eV using synchrotron radiation. Further, the valence-band structure was investigated with ultraviolet photoelectron spectra and valence effective Hamiltonian calculations. A significant difference was observed between the photon energy dependencies of photoion and photoelectron yields. The threshold energy for photoion emission was found to be 10.5 eV, while that for photoelectron emission was 8.5 eV, indicating holes created near the valence-band top do not contribute to the ion emission. At the higher-energy region, the ion emission efficiency was found to be enhanced in the photon energy region of 17–28 eV. The difference between the threshold energies of photoion and photoelectron emission and the enhancement of the photoion emission are discussed in conjunction with the valence-band structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351983
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon dioxide laser photolysis of mixtures of dichlorofluoromethane-h and -d (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 3469-3473 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100241a023
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Extracranial vertebral artery aneurysm with neurofibromatosis (1990)
    Springer
    Neuroradiology 31 (1990), S. 533-536 
    Details
    ISSN: 1432-1920
    Keywords: Extracranial vertebral artery aneurysm ; Neurofibromatosis ; Detachable balloon ; Endovascular occlusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An extracranial vertebral artery aneurysm in a patient with neurofibromatosis is described. The aneurysm was treated by endovascular balloon occlusion of the proximal vetebral artery. The details of the therapeutic management are discussed, and the vascular manifestations of neurofibromatosis are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340136
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  • 4
    Electronic Resource
    Electronic Resource
    Contribution of meningeal arteries to cerebral arteriovenous malformations (1993)
    Springer
    Neuroradiology 35 (1993), S. 205-209 
    Details
    ISSN: 1432-1920
    Keywords: Cerebral arteriovenous malformation ; Meningeal arterial feeders ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied 52 patients with cerebral arteriovenous malformations (AVMs) by selective angiography and found that half received supply from meningeal branches of the external carotid artery. The frequency of meningeal arteral contribution was significantly higher in superficial AVMs, especially in the temporal, parietal and occipital regions. Larger lesions and higher shunt with steal phenomena on angiography were other factors favouring a meningeal arterial contribution. Diffuse AVMs with pial arterial networks around the nidus commonly received meningeal blood supply. In the past, meningeal feeders have been though to be congenital, but this study suggests that they may develop during growth of the AVM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588495
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic resonance imaging of the brain in congenital rubella virus and cytomegalovirus infections (1991)
    Springer
    Neuroradiology 33 (1991), S. 239-242 
    Details
    ISSN: 1432-1920
    Keywords: Congenital infection ; Cytomegalovirus ; Rubella ; Central nervous system (CNS) ; Magnetic resonance imaging (MRI)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two children with congenital rubella virus and six with cytomegalovirus (CMV) infections, were examined by magnetic resonance (MR) and CT. Cranial MR imaging (MRI) with T2-weighted spin-echo (SE) and inversion recovery (IR) sequences demonstrated the following: periventricular hyperintensity (4), subcortical hyperintensity (5), delayed myelination (4), oligo/pachygyria (2), cerebellar hypoplasia (2). This study showed that the more-disabled children had more marked abnormal MRI findings. MRI was more effective in the detection of parenchymal lesion than was CT, although intraventricular calcification was better visualized with CT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588225
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of HA1077 on the cerebral circulation after subarachnoid haemorrhage in dogs (1991)
    Springer
    Acta neurochirurgica 110 (1991), S. 185-188 
    Details
    ISSN: 0942-0940
    Keywords: HA1077 ; cerebral vasospasm ; subarachnoid haemorrhage ; cerebral blood flow ; calcium antagonist
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We examined the effects of the recently developed calcium antagonist HA1077 on cerebral haemodynamics during the chronic stage of the two-haemorrhage canine model system of vasospasm. Regional cerebral blood flow (rCBF), regional cerebral blood velocity and regional cerebral blood volume in the canine parietal cortex were measured by Laser-doppler flowmeter. On the 7th day after the initial injection of autogenous blood, subarachnoid haemorrhage (SAH) produced a significant decrease in rCBF (59% of control, p〈0.05) and Hood velocity (48% of control, p〈0.05), with no remarkable change in blood volume (108% of control). Bolus intravenous administration of HA1077 (0.1–0.3 mg/kg) dose-dependently increased the rCBF and blood velocity, without significantly changing the blood volume on Day 7 after SAH. HA1077 improves haemodynamic function manifested by an increase in rCBF and velocity in this SAH model, and may be suitable for the treatment of vasospasm in patients with SAH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400689
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  • 7
    Electronic Resource
    Electronic Resource
    Development of the operating computerized tomographic scanner system for neurosurgery (1991)
    Springer
    Acta neurochirurgica 111 (1991), S. 61-63 
    Details
    ISSN: 0942-0940
    Keywords: Computerized tomography ; neurosurgery ; clinical imaging ; operating room
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A computerized tomographic (CT) scanner system for intraoperative imaging is presented. The system consists of the following: 1) CT scanner with a mobile gantry, 2) digitally controlled operating table with central processing unit (CPU) and encoder unit; the table can be controlled by the scanner computer as accurately as the scanner bed, and 3) exclusively designed head fixation devices. It allows us to scan the patient on the operating table in the operating room pre-operatively, intra-operatively and immediately after surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402515
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Meningiomas: Correlation between MRI characteristics and operative findings including consistency (1994)
    Springer
    Acta neurochirurgica 129 (1994), S. 39-46 
    Details
    ISSN: 0942-0940
    Keywords: Tumour consistency ; meningiomas ; MRI ; T 2-weighted image
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The findings on magnetic resonance imaging (MRI) in 73 surgically verified intracranial meningiomas were correlated with their histology and consistency during resection. T 1-weighted imaging was least useful since most of the tumours were iso-intense, similar to cortical grey matter regardless of histology or tumour consistency. The signal intensity on T 2-weighted images was found to best correlate with both the histology and consistency of the meningioma. Generally, the low intensity portion of the tumour on T 2-weighted images indicated a more fibrous and harder character, while the higher intensity portions indicated a more soft character. Most of the fibroblastic meningiomas showed the features of a hard tumour while angioblastic tumours showed the features of soft tumours. Tumours predicted to be harder on MR imaging generally took longer to resect than softer ones, and this relationship was shown best for the larger tumours. Using linear regression analysis, it appears that operative time for soft tumours is more affected by factors other than tumour consistency. Blood loss during surgery was also unrelated to the consistency of the tumour. These results suggest that the histology and consistency of meningiomas may be predictable from findings on T 2-weighted imaging, and this may also predict the difficulty and time required for resection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400871
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  • 9
    Electronic Resource
    Electronic Resource
    Dural arteriovenous malformations in the anterior cranial fossa (1994)
    Springer
    Acta neurochirurgica 129 (1994), S. 146-151 
    Details
    ISSN: 0942-0940
    Keywords: Anterior cranial fossa ; anterior ethmoidal artery ; dural arteriovenous malformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two cases of dural arteriovenous malformation (DAVM) fed by the anterior ethmoidal artery in the anterior cranial fossa are reported, one of them examined by magnet resonance imaging (MRI). Only one other case with MRI findings so far has been published. Fourty-eight previously reported cases are reviewed. One of our patients presented with subdural haematoma (SDH) without subarachnoid or intracerebral haemorrhage. The other patient had a nasal bleed without any neurological manifestations. In comparison with previously reported cases, the clinical manifestation of our cases is infrequent (1 patient with nasal bleed, and 2 patients with pure SDH that is 2 and 4%, respectively, in the literature). Feeder was the anterior ethmoidal artery either unilateral or bilateral. Drainage of DAVMs was through a markedly dilated vascular sac into the superior sagittal sinus (SSS). The high incidence of haemorrhage from DAVM in the anterior fossa is related to this vascular sac. Magnetic resonance imaging (MRI) showed a flow void area in the left frontal region on T 1-weighted images in one case. These cases were treated by surgical excision of the malformation with good results. Aetiology, clinical presentation, and treatment of these rare DAVMs in the anterior cranial fossa is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01406494
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  • 10
    Electronic Resource
    Electronic Resource
    A simple three-dimensional display model based on recorded CT scan films for surgical reference technical note (1984)
    Springer
    Acta neurochirurgica 71 (1984), S. 47-53 
    Details
    ISSN: 0942-0940
    Keywords: Surgical instrument ; computerized tomography (CT) ; intracranial mass lesion ; brain tumour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A simple method of making a three-dimensional display model of recorded computerized tomography (CT) scan films is presented. The reconstructed display model provides useful information as to surgical approaches to intracranial mass lesions. The actual size and three dimensional shape of a lesion and its topographical relationship to surrounding brain structures are easily grasped by directly handling this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01401150
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