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  • 1
    ISSN: 0942-0940
    Keywords: Astrocytoma ; radiation therapy ; radiation necrosis ; thallium-201
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary SPECT scanning with TI-201 and Tc-99m offers a unique, inexpensive functional imaging modality to combine with CT stereotactic craniotomy for guiding resection of necrosis and/or tumour in patients treated with escalated doses of radiation (〉6000 cGy) by either brachytherapy or radiosurgery. Thirty-two cases were analyzed, with a detailed description of the imaging and operative techniques.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1523-9829
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Technology , Medicine
    Notes: Abstract The goal of the Image Guided Therapy Program, as the name implies, is to develop the use of imaging to guide minimally invasive therapy. The program combines interventional and intraoperative magnetic resonance imaging (MRI) with high-performance computing and novel therapeutic devices. In clinical practice the multidisciplinary program provides for the investigation of a wide range of interventional and surgical procedures. The Signa SP 0.5 T superconducting MRI system (GE Medical Systems, Milwaukee, WI) has a 56-cm-wide vertical gap, allowing access to the patient and permitting the execution of interactive MRI-guided procedures. This system is integrated with an optical tracking system and utilizes flexible surface coils and MRI-compatible displays to facilitate procedures. Images are obtained with routine pulse sequences. Nearly real-time imaging, with fast gradient-recalled echo sequences, may be acquired at a rate of one image every 1.5 s with interactive image plane selection. Since 1994, more than 800 of these procedures, including various percutaneous procedures and open surgeries, have been successfully performed at Brigham and Women's Hospital (Boston, MA).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 10 (1975), S. 177-178 
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La ventriculographie positive au Dimer X a permis de constater un recessus infundibulaire intrahypophysaire chez une femme de 34 ans atteinte d'hydrocéphalie obstructive. Les auteurs admettent la pathogénie malformative.
    Abstract: Zusammenfassung Bei einer 34-jährigen Patientin mit Hydrocephalus bei Liquorpassagestörung durch einen Mittelhirnprozeß kam im Ventrikulogramm mit Dimer X ein abnormer intrasellarer Recessus des 3. Ventrikels zur Darstellung. Nach seiner Lokalisation und nach ontogenetischen sowie phylogenetischen Gesichtspunkten ist er als persistierender intrahypophysärer Recessus infundibuli zu bezeichnen. Eine Fehlbildung infolge einer Entwicklungshemmung wird angenommen.
    Notes: Summary X-ray examination of the intracranial ventricles with Dimer X made it possible to make the diagnosis of obstructive hydrocephalus due to a mass lesion of the midbrain and an abnormal intrasellar recess of the third ventricle in a 34 year old female patient. Considering the location and ontogenetic and phylogenetic facts one can diagnose the second pathological finding as a persisting intrapituitary recessus infundibuli. A malformation due to inhibition during development is to be assumed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2102
    Keywords: Key words Minimally invasive surgery • Magnetic resonance imaging • Minimally invasive therapy • Interventional magnetic resonance imaging ; Schlüsselwörter Magnetresonanztomographie • Interventionelles MRI • Minimal invasive Therapie • Minimal invasive Chirurgie • Lasertherapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Magnetresonanztomographie (MRT) eignet sich als nichtinvasives Verfahren mit hoher Auflösung besonders gut zur Bildgebung für minimal invasive, chirurgische oder interventionelle Eingriffe. Eine wesentliche Voraussetzung ist jedoch die Entwicklung offener MR-Systeme. Das hier beschriebene, offene MR-System mit supraleitendem 0,5-T-Magneten (SIGNA SP,GE) erlaubt den Zugang zum Patienten auch während der Bildaquisition und die interaktive Kontrolle der Bildebene durch den Benutzer. Die kontinuierliche Bildunterstützung ermöglicht neue Techniken zur Führung interventioneller oder chirurgischer Eingriffe, eine genauere Lokalisation von Instrumenten und die unmittelbare Verlaufskontrolle nahezu in Echtzeit. Klinische Anwendungen dieser Technologie werden dargestellt. Durch schnelle Rechentechniken für das Bildmanagement und intraoperative Bildgebung, ermöglicht das offene MR-System die Entwicklung neuer, besonders effizienter interventioneller und minimal invasiv chirurgischer Verfahren.
    Notes: Purpose: To develop a superconducting magnetic resonance (MR) imager that provides direct access to the patient and permits interactive MR-guided interventional procedures. Materials and methods: A 0.5-T superconducting magnet that allows a region of vertical access to the patient was designed and constructed. This magnet was integrated with newly designed shielded gradient coils, flexible surface coils, nonmagnetic displays, position-monitoring probes and device-tracking instrumentation. Results: The magnet homogeneity was 12.3 ppm or better, and the gradient field was linear to within 1 % over an imaging region of 30 cm in diameter. The signal-to-noise ratio was 10 % higher than in a comparable 0.5-T superconducting imager. Images were obtained in several anatomic regions with use of routine pulse sequences. Interactive image plane selection and near real-time imaging, with use of fast gradient-recalled echo sequences were demonstrated at a rate of one image every 1.5 s. More than 240 procedures (including open brain surgery) have been successfully performed within this environment. Conclusions: MR-guided interventional and surgical procedures can be performed with full patient access using an open-configuration, superconducting MR magnet with near real-time imaging and interactive image plane control.
    Type of Medium: Electronic Resource
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