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  • 1
    Electronic Resource
    Electronic Resource
    Titanium clips in neurosurgery for elimination of artefacts in computer tomography (CT) (1977)
    Springer
    Acta neurochirurgica 38 (1977), S. 101-109 
    Details
    ISSN: 0942-0940
    Keywords: Computer tomography ; titanium clips ; artefacts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To eliminate the occurrence of artefacts produced by clips on the CT images, the use of titanium clips is suggested. Testsin vitro andin vivo indicate that clips manufactured from 0.2 mm thick 99.9 per cent titanium do not cause artefacts. They are resistant to corrosion, nontoxic, effective, easy to handle, relatively cheap, and are visible on plain X-ray films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01401546
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Positron-Emission Tomography as a Radiological Technique in Neuroendocrine Gastrointestinal Tumors (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 733 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb17294.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The limitations of definition of blood vessels with computer intravenous angiography (1976)
    Springer
    Neuroradiology 11 (1976), S. 35-40 
    Details
    ISSN: 1432-1920
    Keywords: Intravenous angiography ; Computerized axial tomography ; Limitations contrast enhancement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using a polystyrene phantom and various concentrations of iodine contrast material, the discrimination of blood vessels by the EMI scanner was studied. Although a 2 mm tube can be delineated using high concentrations of iodine, smaller tubes are not seen due to noise inherent in the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327256
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A ring detector positron camera system: Its merits; Clinical experience (1978)
    Springer
    Neuroradiology 16 (1978), S. 572-574 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A ring detector positron camera system for CT of the brain is described. The system uses 95 NaI (Tl) detectors, arranged with cylindrical geometry, for the simultaneous detection of coincidences from 1900 detector combinations. With a new sampling technique an experimental system resolution of 7 mm FWHM has been obtained. The sensitivity was found to be 5300 c/s with a 100-keV energy threshold and using a 19.2-cm-diameter cylindrical phantom with a homogeneous specific activity of 1 μCi/cm3. A clinical study of blood-brain barrier damage using 68Ga-EDTA is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395365
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Early contrast enhancement of acoustic neuroma (1978)
    Springer
    Neuroradiology 17 (1978), S. 31-33 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography ; Contrast medium enhancement ; Acoustic neuroma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The changes of the enhancement of the lesion with time after intravenous administration of contrast medium were measured with computed tomography (CT) in 23 cases of acoustic neuroma. The pattern of high initial enhancement followed by a fairly rapid decrease is confirmed. A more rigorous study of the enhancement pattern using a mathematical description of the enhancement curve of the tumor as well as a measurement of the individual blood enhancement curve is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00345267
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Relaxation and force during fatigue and recovery of the human quadriceps muscle: relations to metabolite changes (1991)
    Springer
    Pflügers Archiv 418 (1991), S. 153-160 
    Details
    ISSN: 1432-2013
    Keywords: ATP ; Electrical stimulation ; Force ; Phosphate ; Phosphocreatine ; Relaxation ; Skeletal muscle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Force and relaxation were measured during electrical stimulation of the quadriceps muscle of 14 volunteers. Stimulation produced 51.2 s of intermittent ischaemic contractions either as 16 3.2-s tetani or as 64 0.8-s tetani. Changes during recovery were followed for 180 s. On 8 subjects muscle biopsies were taken during work and after the rest period for determination of ATP, phosphocreatine and intermediates in glucolysis. The stimulation using 0.8-s contractions gave more pronounced fatigue and slowing of relaxation. There was a good correlation between force and relaxation during work but this relation changed during recovery, indicating that no general relation exists between these two contraction characteristics. In the 0.8-s stimulation more ATP was utilized and there were more profound changes in metabolite levels. We found a correlation between estimated [H2PO 4 − ] and relaxation covering both work and recovery and hypothesize that inorganic phosphate and its removal by phosphocreatine resynthesis during recovery might be important. Since stimulation patterns differ in force and relaxation even after the recovery period we suggest that additional factors, such as pH, are of importance in this work model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370464
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Contraction characteristics of the human quadriceps muscle during percutaneous electrical stimulation (1990)
    Springer
    Pflügers Archiv 417 (1990), S. 136-141 
    Details
    ISSN: 1432-2013
    Keywords: Electrical stimulation ; Fatigue ; Force ; Frequency ; Skeletal muscle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Percutaneous electrical stimulation was used to study the force response of the quadriceps muscle. The normal frequency dependence of force was investigated in muscles at rest and after fatiguing contractions. A comparison between force response during fatigue induced by electrical stimulation at different frequencies and by voluntary work suggested equal changes in contractility, irrespective of the fatigue-inducing procedure. In fresh muscle we found a linear relation between stimulation period (10–100 ms) and force. At fatigue the relation changes with maximal deviation from linearity at a 50-ms period (20 Hz). There is a rapid recovery of high frequency force whereas the low frequency response remains low even after 30 min rest. At very low frequencies there is initially unexpectedly high force in fatigued muscle. This could be a result of increased fusion of twitches with initially prolonged relaxation time. To study the twitch summation we compared experimental results in a wide frequency range with computer-simulated twitch summations and present the frequency dependence of summation processes in human quadriceps muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370690
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Attenuation values of the cerebrospinal fluid (CSF) (1978)
    Springer
    Neuroradiology 15 (1978), S. 165-166 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography ; Cerebrospinal fluid ; Attenuation value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The attenuation value of CSF, obtained by lumbar puncture, was determined with computed tomography in 25 patients. Measurement of the protein content in the same samples showed no correlation with the attenuation value. It is concluded that in the normal range of protein concentrations, the effect on the attenuation is insignificant and that the attenuation value of the CSF might be used to check large deviations in the CT numbers due to artifacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329061
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Diagnosis of sellar and parasellar lesions by computed tomography (1979)
    Springer
    Neuroradiology 18 (1979), S. 249-258 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography, head ; Pituitary gland, neoplasms ; Sella turcica, anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Suspected lesions in and around the sella were examined by CT in 129 cases. The diagnostic accuracy and various technical aspects of the method are described. The mean attenuation and enhancement after administration of contrast material are evaluated in craniopharyngiomas, chromophobe adenomas, meningiomas, aneurysms, dermoid cysts, an arachnoid cyst and a glioma. The choice of collimator and its use in relation to sellar dimensions, particularly the sellar depths, are emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327688
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Attenuation changes of the ventricular CSF after intravenous injection of contrast material (1978)
    Springer
    Neuroradiology 15 (1978), S. 167-170 
    Details
    ISSN: 1432-1920
    Keywords: Computed tomography, brain ; Contrast material ; Cerebrospinal fluid ; Cerebral ventricles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The CT attenuation change of the intraventricular CSF after i. v. administration of contrast material has been studied in 20 patients. A very small increase of attenuation was observed in the entire material. The method does not seem to be appropriate at present for the study of small attenuation changes in the CSF reflecting the passage of contrast material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329062
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    Paper (German National Licenses)
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