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  • 1
    Electronic Resource
    Electronic Resource
    Cerebrospinal fluid flow (1992)
    Springer
    Neuroradiology 35 (1992), S. 1-9 
    Details
    ISSN: 1432-1920
    Keywords: Magnetic resonance imaging ; Cerebrospinal fluid flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cardiac-related motion of the cerebrospinal fluid (CSF) was investigated by analysis of the velocity-dependent phase of CSF protons and flow-dependent signal enhancement in magnitude images using ECG-gated FLASH sequences. In the cerebral aqueduct, CSF flow from the third to the fourth ventricle begins 200 msafter the R-wave of the ECG and simulates an arterial pulse wave pattern. It lasts about 60% of the cardiac cycle and is followed by backflow from the fourth to the third ventricle, which is slower and shorter. In the spinal canal, oscillating caudad motion precedes flow from the third to the fourth ventricle by about 50–100 ms and issuperimposed on a bulk flow, which moves simultaneously in opposite directions in separate subarachnoid channels; it is directed mainly caudally in the anterior cervical subarachnoid space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588270
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cerebrospinal fluid flow (1992)
    Springer
    Neuroradiology 35 (1992), S. 10-15 
    Details
    ISSN: 1432-1920
    Keywords: Cerebrospinal fluid flow ; Magnetic resonance imaging ; Real time ; Yawning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cerebrospinal fluid (CSF) flow in the cerebral aqueduct and spinal canal was analysed using real-time magnetic resonance imaging measurement techniques. Respiration-induced rhythmic modulation of the cardiacrelated oscillating CSF pulsation in the cerebral aqueduct and spinal canal was found. Deep inspiration was immediately followed by a marked increase in downward CSF flow in the cervical spinal canal, whereas a delay of about two heart beats was seen before downward flow from the third to the fourth ventricle increased. This pattern was also detected during yawning and was followed by a marked increase of blood flow in the internal jugular vein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588271
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Sodium-MR-imaging of the brain: initial clinical results (1988)
    Springer
    Neuroradiology 30 (1988), S. 399-407 
    Details
    ISSN: 1432-1920
    Keywords: Magnetic resonance imaging ; Sodium imaging ; Brain tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twelve patients with different diseases of the brain were examined with sodium and proton MRI at 1.5 Tesla and the results of both studies compared. Due to the 1500-fold lower concentration in the body, the decreased sensitivity and the shorter relaxation times of sodium compared with hydrogen a sequence with gradient reversal and a volume imaging method was applied to achieve a short echo time (4.5 ms). As a result of the mainly extracellular distribution of sodium the CSF spaces are depicted by their high signal intensity while the normal parenchyma is not visible. Changes induced by encephalitis, ischemic infarction and tumors can also be detected by their increased sodium content. Different tumors provided different signal intensities, not always permitting a distinction between tumor, surrounding edema and CSF. The diagnostic impact of these findings is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404105
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Reversible brain shrinkage in abstinent alcoholics, measured by MRI (1988)
    Springer
    Neuroradiology 30 (1988), S. 385-389 
    Details
    ISSN: 1432-1920
    Keywords: Alcohol ; Magnetic resonance imaging ; Brain shrinking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Magnetic resonance imaging of the intracranial CSF volume was compared before and after 5 weeks of confirmed abstinence in 9 alcohol-dependent patients. All patients showed a highly significant reduction in CSF volume in accordance with reexpansion of the brain after alcohol abstinence. T2 values for white matter, estimated by linear regression from 16 echoes of a CPGM sequence, however, showed no significant increase such as occurs in rehydration. This indicates, that alcohol-induced reversible brain atrophy cannot be attributed to fluctuation of free water in the brain only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404102
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Three-dimensional chemical shift-selective MRI of a ruptured intracranial dermoid cyst (1996)
    Springer
    Neuroradiology 38 (1996), S. 572-574 
    Details
    ISSN: 1432-1920
    Keywords: Key words Intracranial dermoid cyst ; 3D chemical-shift-selective imaging ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a man with a ruptured intracranial dermoid cyst, suffering from headache, nausea, vomiting and a generalised seizure. MRI was performed before and 2 weeks after surgical resection. On T 1-weighted images the tumour gave high signal, as did fatty material in the frontal and parietal brain sulci. Identification of this hyperintense material as lipids was possible by chemical-shift-selective 3 D gradient-echo imaging, which provided excellent contrast between the subarachnoid lipids and the adjacent normal brain, with a good spatial resolution. Possible complications of subarachnoid and intraventricular lipid particles after dermoid cyst rupture are discussed and the diagnostic value of 3 D chemical-shift-selective additional to conventional T 1-weighted spin-echo images in identification of even small amounts of fat is emphasised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626102
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Three-dimensional chemical shift-selective MRI of a ruptured intracranial dermoid cyst (1996)
    Springer
    Neuroradiology 38 (1996), S. 572-574 
    Details
    ISSN: 1432-1920
    Keywords: Intracranial dermoid cyst ; 3D chemical-shift-selective imaging ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a man with a ruptured intracranial dermoid cyst, suffering from headache, nausea, vomiting and a generalised seizure. MRI was performed before and 2 weeks after surgical resection. On T1-weighted images the tumour gave high signal, as did fatty material in the frontal and parietal brain sulci. Identification of this hyperintense material as lipids was possible by chemical-shift-selective 3 D gradient-echo imaging, which provided excellent contrast between the subarachnoid lipids and the adjacent normal brain, with a good spatial resolution. Possible complications of subarachnoid and intraventricular lipid particles after dermoid cyst rupture are discussed and the diagnostic value of 3 D chemical-shift-selective additional to conventional T1-weighted spin-echo images in identification of even small amounts of fat is emphasised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626102
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Influence of magnetic resonance imaging on somatosensory and brain-stem auditory evoked potentials in man (1988)
    Springer
    Journal of neurology 235 (1988), S. 462-465 
    Details
    ISSN: 1432-1459
    Keywords: Evoked potentials ; Magnetic resonance imaging ; Somatosensory evoked potentials ; Brain-stem auditory evoked potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary There is still a need to prove that even static magnetic fields up to 1.5 T used in magnetic resonance imaging (MRI) are biologically safe and harmless for humans. Recordings of median and ulnar nerves and brain-stem auditory evoked potentials in 20 patients were completed prior to and after MRI investigation of the central nervous system. Neither the somatosensory nor the auditory evoked potentials exhibited any significant change of latencies, interpeak latencies or amplitudes. Since these electrophysiological parameters are highly dependent on the quality of nerve conduction and integrity of information processing in various nuclei, it may be assumed that MRI causes no lasting changes in either respect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314248
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    Paper (German National Licenses)
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