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  • Articles: DFG German National Licenses  (2)
  • 1995-1999  (2)
  • 1998  (2)
  • Asceptic bone necrosis  (1)
  • Virtuelle Endoskopie  (1)
  • Amidotrizoate
Source
  • Articles: DFG German National Licenses  (2)
Material
Years
  • 1995-1999  (2)
Year
  • 1
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Spiral-CT ; Virtuelle Endoskopie ; Larynx ; Key words Helical CT ; Virtual endoscopy ; Larynx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary This pilot study investigated the feasibility and clinical value of high-resolution virtual real-time laryngoscopy based on helical CT data sets. Nine patients with laryngeal pathology (three with tumors of the vocal cords, two laryngeal carcinomas, one with invasion of the larynx by thyroid carcinoma and six subglottic stenoses) underwent examination by helical CT at a collimation of 1 mm. Following acquisition, the images were processed at a workstation with standard visualization software, such that virtual endoscopy (VE) in real time was possible. The images were then compared with the findings of conventional endoscopy. Because of swallowing artifacts, reconstruction failed in 2 of 12 patients. None of the carcinomas of the vocal cords was recognized at VE or in the cross-sectional CT images. VE provided the correct diagnosis in 8 of 12 cases (laryngeal tumors, subglottic stenoses). Virtual laryngoscopy is capable of simulating the visual findings of endoscopy in cases of laryngeal tumors and subglottic stenoses. Small tumors of the vocal cords are not adequately visualized. The major problem affecting results is motion artifacts resulting from involuntary swallowing.
    Notes: Zusammenfassung Im vorliegenden Beitrag wird eine Pilotstudie zur Überprüfung der Machbarkeit und des klinischen Nutzens einer hochauflösenden virtuellen Echtzeitlaryngoskopie aus Spiral-CT-Datensätzen vorgestellt. 12 Patienten mit Erkrankungen im Kehlkopfbereich (3 Stimmlippentumore, 2 Larynxkarzinome, ein in den Larynx eingebrochenes Schilddrüsenkarzinom und 6 subglottische Stenosen) wurden mittels hochauflösender Spiral-CT (Kollimation 1 mm) untersucht. Anschließend wurden die Bilder auf einer Workstation mit einer standardmäßigen Visualisierungssoftware so rekonstruiert, daß eine virtuelle Endoskopie (VE) in Echtzeit möglich wurde, welche der herkömmlichen Fiberendoskopie gegenübergestellt wurde. 2 der 12 Patienten waren bedingt durch Schluckartefakte nicht zu rekonstruieren. Keines der Stimmlippenkarzinome war in der VE oder den Querschnittsbildern zu erkennen. In 8 von 12 Fällen war die VE diagnostisch (Larynxtumore, subglottische Stenosen). Die virtuelle Laryngoskopie in der hier beschriebenen Technik vermag Larynxtumoren und subglottische Stenosen, nicht aber kleine Stimmbandtumoren in einer dem Kliniker vertrauten endoskopischen Sichtweise darzustellen. Hauptproblem sind Bewegungsartefakte durch unwillkürliche Schluckbewegungen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2161
    Keywords: Key words Pisiform bone transposition ; MRI ; Lunatomalacia ; Asceptic bone necrosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. Transposition of the pisiform bone is an operative treatment for lunatomalacia. The postoperative viability of the transposed pisiform bone is difficult to assess. The purpose of the study was to evaluate the utility of MRI for postoperative assessment of viability of the pisiform and lunate bones. Design and patients. Six patients who underwent transposition of the pisiform for treatment of lunatomalacia, were assessed pre- and postoperatively with conventional radiographs (including tomography), CT and MRI. Results. Conventional radiographs, conventional tomograms and CT were all useful in demonstrating the location of the transposed pisiform. CT showed the transposed pisiform without superposition. However, neither CT nor conventional techniques provided information regarding viability of the pisiform. In all patients investigated in the first year following surgery, T1-weighted MR images showed high signal intensity in the transposed bones. In all patients investigated after 1 year, the signal intensity decreased to an intermediate level on T1-weighted images. Enhancement following contrast medium administration in the transposed pisiform and the lunate was noted in all patients, indicative of viability. Conclusion. Contrast-enhanced MRI is able to provide important information regarding the viability of the transposed pisiform and the remaining parts of the lunate. Thus, contrast-enhanced MRI provides an improved means of postoperative assessment regarding short-term follow-up following pisiform transposition. In the long-term follow-up conventional radiography and CT may be equal to MRI in showing increasing sclerosis and/or fragmentation.
    Type of Medium: Electronic Resource
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