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  • 1
    Electronic Resource
    Electronic Resource
    CT differentiation between necrotic and nonnecrotic small bowel in closed loop and strangulating obstruction (1999)
    Springer
    Abdominal imaging 24 (1999), S. 120-124 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Small bowel—Closed loop—Strangulating obstruction—Intestinal necrosis—Computed tomography—Multivariate analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: The purpose of this study was to evaluate computed tomographic (CT) findings for predicting the presence of intestinal necrosis in patients with closed loop and strangulating obstruction of the small bowel. Methods: Twenty-five patients with surgically confirmed closed loop and strangulating obstruction were divided into two groups with (n= 16) and without (n= 9) intestinal necrosis. By using univariate and multivariate statistical procedures, we evaluated the differences in CT findings between the two groups on the basis of the following six findings: bowel dilatation of strangulated loops (bowel dilatation), wall thickening of strangulated intestines (wall thickening), ascites, vascular dilatation of affected mesenteries (vascular dilatation), elevation of mesenteric attenuation (mesenteric attenuation), and radial distribution of the mesenteric vessels (radial distribution). Results: Of the six findings, ascites, vascular dilatation, mesenteric attenuation, and radial distribution provided significant discriminating findings between the two groups on univariate analysis. On multivariate analysis, mesenteric attenuation was the most important discriminative factor, followed by radial distribution and ascites. Using these three parameters, the CT was correlated with the surgical findings in 15 of the 16 patients in the necrosis group (sensitivity = 93.8%) and in eight of the nine patients in the nonnecrosis group (specificity = 88.9%). The overall accuracy was 92.0%. Conclusions: Mesenteric attenuation, radial distribution, and ascites, depicted on CT differentiate well between necrosis and nonnecrosis of the small bowelin patients with closed loop and strangulating obstruction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900458
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    MR signal intensity of the perirolandic cortex in the neonate and infant (1996)
    Springer
    Neuroradiology 38 (1996), S. 578-584 
    Details
    ISSN: 1432-1920
    Keywords: Key words Child's brain ; Magnetic resonance imaging ; Myelination ; Brain development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to study the magnetic resonance (MR) signal intensity of the perirolandic gyri perinatally and to correlate it with the histological findings in formalin-fixed brains, focusing on myelination. MRI of 20 neurologically normal neonates and infants, of 37–64 weeks postconception (PCA), were studied retrospectively. We reviewed four formalin-fixed brains of infants 37–46 weeks PCA microscopically. The posterior cortex of the precentral gyrus (P-PRE) and the anterior cortex of the postcentral gyrus (A-PST) had different signal intensity from the adjacent surrounding cortex. On T 1-weighted images P-PRE and A-PST gave higher signal 41–44 weeks PCA; on T 2-weighted images, they gave lower signal 37–51 weeks PCA. Histological examination revealed very little myelination of the nerve fibres within both the P-PRE and the A-PST, while considerable myelination was present in the internal capsule and central corona radiata. The changes in signal intensity in the perirolandic gyri may reflect not only the degree of myelination but also the more advanced development of the nerve cells, associated with rapid proliferation and formation of oligodendroglial cells, synapses and dendrites. They could be another important landmark for brain maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626104
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    MR signal intensity of the perirolandic cortex in the neonate and infant (1996)
    Springer
    Neuroradiology 38 (1996), S. 578-584 
    Details
    ISSN: 1432-1920
    Keywords: Child's brain ; Magnetic resonance imaging ; Myelination ; Brain development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to study the magnetic resonance (MR) signal intensity of the perirolandic gyri perinatally and to correlate it with the histological findings in formalinfixed brains, focusing on myelination. MRI of 20 neurologically normal neonates and infants, of 37–64 weeks postconception (PCA), were studied retrospectively. We reviewed four formalin-fixed brains of infants 37–46 weeks PCA microscopically. The posterior cortex of the precentral gyrus (P-PRE) and the anterior cortex of the postcentral gyrus (A-PST) had different signal intensity from the adjacent surrounding cortex. On T1-weighted images P-PRE and A-PST gave higher signal 41–44 weeks PCA; on T2-weighted images, they gave lower signal 37–51 weeks PCA. Histological examination revealed very little myelination of the nerve fibres within both the P-PRE and the A-PST, while considerable myelination was present in the internal capsule and central corona radiata. The changes in signal intensity in the perirolandic gyri may reflect not only the degree of myelination but also the more advanced development of the nerve cells, associated with rapid proliferation and formation of oligodendroglial cells, synapses and dendrites. They could be another important landmark for brain maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626104
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Dynamic MRI of meningiomas and schwannomas: is differential diagnosis possible? (1997)
    Springer
    Neuroradiology 39 (1997), S. 633-638 
    Details
    ISSN: 1432-1920
    Keywords: Key words Meningioma ; Schwannoma ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied 23 patients with meningiomas and 14 with schwannomas using dynamic spin-echo (TR/TE 200/15 ms) MRI. Histologically the meningiomas were classified according to the 1993 WHO classification. Serial images were obtained every 30 s for 210 s after rapid injection of gadopentetate dimeglumine (0.1 mmol/kg). The contrast-enhancement ratio (CER) was divided into three patterns; a sharp rise with a peak within 60 s (A), a relatively rapid increase with a peak between 60 and 210 s (B), a slow increase without a peak (C). The patterns were correlated with the histology of the tumors. The signal intensities of the tumours on T2-weighted images were also analyzed and correlated with the dynamic patterns. Meningiomas had more varied dynamic patterns than schwannomas. Almost half of the meningiomas showed pattern A, and one third pattern C. Of six meningothelial meningiomas showed pattern A; all schwannomas and fibrous meningiomas showed pattern C. Various patterns were observed in transitional meningiomas. Of the 8 meningiomas showing pattern C, only one gave high signal on T2-weighted images, and could not be differentiated from the schwannomas. Thus, one third of meningiomas could not be differentiated from schwannomas by the dynamic contrast enhancement alone. However, when this was combined with the signal intensity on T2-weighted images, most meningiomas could be differentiated from schwannomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050482
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Virtual MRI endoscopy of the intracranial cerebrospinal fluid spaces (1998)
    Springer
    Neuroradiology 40 (1998), S. 644-650 
    Details
    ISSN: 1432-1920
    Keywords: Key words Magnetic resonance imaging ; three-dimensional ; Virtual endoscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We used constructive interference in steady state (CISS) 3D Fourier transform (3DFT) MRI data sets to obtain three-dimensional (3D) virtual MRI endoscopic views of the intracranial cerebrospinal fluid (CSF) spaces, processing them with a commercially available perspective endoscopic algorithm. We investigated the potential of the intracranial virtual MRI endoscopy applied to visualisation of the pathology in 13 patients with surgically confirmed trigeminal neuralgia (3), hemifacial spasm (3), acoustic neuroma (3), suprasellar germinoma (1), Langerhans cell histiocytosis (1), lateral ventricle nodules (1) and pituitary dwarfism (1). All images were acquired using a 1.5-T imager employing a circular polarised head coil. The CISS-3DFT data sets were transferred to a workstation for processing with the perspective endoscopic algorithm. Postprocessing for virtual MRI endoscopy was possible for all data sets. The lesions in 12 patients, and their complex anatomical relationships with the surrounding structures, were well seen on the 3D images. A small acoustic neuroma in the internal auditory meatus was not seen using virtual endoscopy. Although virtual MRI endoscopy has limitations, it provides 3D images which cannot be acquired using any other procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050656
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    Paper (German National Licenses)
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