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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
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The normal pituitary examined with positron emission tomography and (methyl-11C)-L-methionine and (methyl-11C)-D-methionine (1987)
    Springer
    Neuroradiology 29 (1987), S. 221-225 
    Details
    ISSN: 1432-1920
    Keywords: Positron emission tomography ; Brain metabolism ; Amino acids ; Stereospecificity ; Pituitary gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Four patients with radiologically normal pituitary gland were examined with positron emission tomography after the administration of (methyl-11C)-L-methionine. On a following day the examination was repeated with (methyl-11c)-D-methionine. The accumulation rate of L-methionine in the pituitary was measured, giving a value that was about twice that of normal brain tissue. The accumulation rate of D-methionine in the pituitary was almost a factor of 10 lower than that of L-methionine. In the normal brain tissue that ratio was 2.3. The study clearly indicates that the methionine uptake in the pituitary is stereospecific. 11C-D-methionine is freely distributed in the tissue without entrapment, whereas 11C-L-methionine is irreversibly bound. It is concluded that PET with 11C-L-methionine can be used to study amino acid utilization in the pituitary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00451757
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    An adaptor to the Leksell stereotaxic instrument for digital coordinate determination in radiography (1987)
    Springer
    Neuroradiology 29 (1987), S. 585-587 
    Details
    ISSN: 1432-1920
    Keywords: Stereotaxic techniques ; Digital radiography ; Leksell instrument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Special perspex adaptors with radiopaque reference structures have been constructed to fit to the Leksell stereotaxic instrument. These structures are visualized on X-ray film in a radiographic examination like angiography or encephalography. The films obtained in two projections at arbitrary angles and focus-film-distances are placed on a digitizing table for the determination of the stereotaxic coordinates of selected targets. The reference structures and the targets are marked with a cursor whereupon a desk top computer performs the calculation of the stereotaxic coordinates. The system allows a rapid, simple and accurate coordinate determination in stereotaxic radiography using the Leksell stereotaxic instrument.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350450
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    Paper (German National Licenses)
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    A method of stereotaxic localization adopted for conventional and digital radiography (1986)
    Springer
    Neuroradiology 28 (1986), S. 100-104 
    Details
    ISSN: 1432-1920
    Keywords: Stereotaxic techniques ; Brain imaging ; Angiography ; Radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A method for the determination of stereotaxic coordinates in radiography, e.g. angiography, pneumoencephalography or digital vascular radiography, is described. A special localization frame containing radiopaque structures and scales defines a diagnostic coordinate system. This frame is fixed to the X-ray-table prior to the radiographic procedure and two projections are obtained at arbitrary angles to each other. The focus-film distances do not how to be fixed. The target coordinates are then determined either by a simple graphical procedure or with the use of a digitizing x-y-table, by a computer. With the computer method the films are placed on the digitizing table and the target and a few reference points are marked using a cursor. From the relative positions the computer calculates the coordinates. With the special head fixation system, coordinates of structures visualized in radiographic examinations can be transferred to various therapeutic or diagnostic stereotaxic devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327879
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    Paper (German National Licenses)
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