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  • 1
    Electronic Resource
    Electronic Resource
    3D MR imaging with Gd-DTPA in head and neck lesions (1991)
    Springer
    European radiology 1 (1991), S. 151-157 
    Details
    ISSN: 1432-1084
    Keywords: 3D-MRI ; ray-tracing ; head nad neck ; 3D-reconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Three-dimensional MR imaging technique is not a new concept, however, there is very little experience concerning clinical trials. Especially in head and neck lesions, the accuracu of this new imaging method has not yet been tested. A pilot study was performed to evaluate the diagnostic value of demonstrating the head and neck lesions and topographical structures implemented in a three-dimensional reconstruction of the entire head. The 3D reconstruction mode is based on the ray-tracting model. The application of the contrast medium Gd-DTPA proved to be helpful. Three-dimensional reconstruction revealed clear topographic details of the lesions, including the spread of infiltration and destruction of soft tissue. Additionally, the simultaneous view of multiple slices in different orientations is an ideal method for evalauting the spread of the lesion and to visualize the relation between lesion and surrounding tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00451299
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    MRI with Gd-DTPA in tumours of larynx and hypopharynx (1991)
    Springer
    European radiology 1 (1991), S. 58-64 
    Details
    ISSN: 1432-1084
    Keywords: MRI ; Larynx ; Hypopharyngeal tumours ; Contrast media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-eight patients with tumours of the larynx, divided into supraglottic, glottic, and subglottic lesions, and of the hypopharynx were examined by different MRI techniques using the paramagnetic contrast medium Gd-DTPA. The results of preoperative MRI were compared with clinical laryngoscopy and the pathological tumour classification. The examinations were carried out using plain T1-wand T2-weighted and Gd-DTPA enhanced T1-weighted sequences. Most studies included three slice orientations for optimal assessment of different tumour locations. The most accurate diagnostic information was given by Gd-DTPA-enhanced sequences. The combination of plain images, contrast-enhanced images and subtraction enabled precise assessment of deep infiltration. T2-weighted and proton density sequences conveyed more information about cartilage invasion and liquid-filled structures, but gave more artefacts than T1-weighted images. Laryngoscopy had advantages in T1-classified tumors, as the extent of the tumor could be seen, and offered histological information via biopsy. Diagnostic findings of MRI correlated in 85.7% with the pathologist's report, and laryngoscopy provided exact classification in only 64.3% of patients. Gd-DTPA-enhanced MRI is an important adjunct to non-contrast MR studies, and forms an ideal diagnostic supplement to laryngoscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540106
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A comparison of clinical, pathological and radiological findings with magnetic resonance imaging studies of lymphomas in patients with Sjögren's syndrome (1994)
    Springer
    European archives of oto-rhino-laryngology and head & neck 251 (1994), S. 214-217 
    Details
    ISSN: 1434-4726
    Keywords: Sjögren's syndrome ; Malignant lymphoma ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the past few years a variety of papers on magnetic resonance imaging (MRI) of the salivary glands have been published, mainly focusing on the evaluation of salivary gland tumors. More recently, non-tumorous lesions have also been examined with this imaging technique. In Sjögren's syndrome (SS) a characteristic inhomogeneous pattern with a “honeycomb-like” appearance of the parotid gland tissue has been shown in the T2-weighted sequence. This study shows MRI findings in four cases of intraglandular lymphoma occurring in patients with SS. Four patients with suspected lymphomas were examined with MRI, following which all lesions were either biopsied or removed. This enabled us to correlate clinical, radiological and pathological findings. Results indicate that MRI is a useful imaging tool in the detection of intraglandular lymphatic infiltrates, although it is not possible to distinguish morphologically between a localized lymphatic infiltrate and an early stage malignant lymphoma. Nevertheless, MRI is considered to be a valuable non-invasive method for deciding whether or not to perform a biopsy. Due to the excellent soft tissue differentiation obtained, it is also helpful for the surgeon to plan and perform a successful biopsy with minimal risk to the facial nerve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628426
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Scanning electron microscopic studies of the nasal blood vessels (1988)
    Springer
    European archives of oto-rhino-laryngology and head & neck 244 (1988), S. 363-366 
    Details
    ISSN: 1434-4726
    Keywords: Scanning electron microscopy ; Nasal mucosa ; Blood vessels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Current histological and transmission electron microscopic techniques are insufficient for studying all different aspects of vascular morphology. As a result, we have used scanning electron microscopy (SEM) to examine nasal blood vessels. In our present studies the nasal septa of 15 rabbits were fixed by vascular perfusion, dried by the critical point method and coated with gold for SEM studies. Lower magnifications of specimens using this method show the tissue arrangement in the nasal septum. In higher magnifications the different vessels can be distinguished by their morphological features. The course of the vascular structures can be obverved as well as the junctions between the different vessels. Our results indicate that different morphological techniques must be combined to understand the endonasal vasculature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00497466
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fenestrated endothelia in vessels of the nasal mucosa (1987)
    Springer
    European archives of oto-rhino-laryngology and head & neck 244 (1987), S. 55-60 
    Details
    ISSN: 1434-4726
    Keywords: Nasal mucosa ; Capillaries ; Veins ; Fenestrated endothelium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructure of the vessels in the normal respiratory and olfactory mucosa of the nasal septum was studied in 15 adult rabbits. Capillaries with continuous and fenestrated endothelia could be observed in both tissues. In the respiratory part, many of the fenestrated capillaries were located subepithelially with their fenestrations facing the adjacent epithelium. Fenestrated capillaries of the olfactory mucosa were found mainly in the deeper parts of the tunica propria and usually revealed only a small number of fenestrations in their endothelial lining. It was also demonstrated that muscularized veins sometimes displayed fenestrated areas in their attenuated endothelia. These results are discussed and compared with the appropriate literature. Our results confirm that there is a link between the morphological peculiarities of the vascular wall and the functional behaviour of the nasal mucosa. These findings also emphasize that endothelial fenestrations seem to be characteristic for a certain segment of the microcirculatory system rather than for a distinct type of capillary vessel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453492
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    Paper (German National Licenses)
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