Global ETD Search

1	Software-based gradient nonlinearity distortion correction Lee, Thomas Seward 01 January 2006 (has links) The primary purpose of the thesis is to discuss the use of Magnetic Resonance Imaging (MRI) in functional proton radiosurgery. The methods presented in this thesis were specifically designed to correct gradient nonlinearity distortion, the single greatest hurdle that limits the deployment of MRI-based functional proton radiosurgery systems. The new system central in the thesis fully utilized MRI to provide localization of anatomical targets with submillimeter accuracy. The thesis provides analysis and solutions to the problems related to gradient nonlinearity distortion. The characteristics of proton radiosurgery are introduced, in addition to a discussion of its advantages over other current methods of radiation oncology. A historical background for proton radiosurgery is also presented, along with a description of its implementation at Loma Linda University Medical Center (LLUMC), where a new system for functional proton radiosurgery has been proposed and is currently under development. Magnetic resonance imaging Radiosurgery Proton beams Therapeutic use Three-dimensional imaging in medicine Surgery Data processing Magnetic resonance imaging Proton beams Therapeutic use Radiosurgery Surgery Data processing Three-dimensional imaging in medicine. Software Engineering
2	Conception d'un système d'aide à la chirurgie sur base de la modélisation d'opérations, d'un recalage temporel des données et d'un recalage sémantique de métadonnées Malarme, Pierre 10 October 2011 (has links) Le but principal de cette thèse de doctorat est de concevoir un système de chirurgie assistée par la connaissance. Cette connaissance est extraite de l'information issue des données et du contexte capturés en salle d'opération. Ce contexte est défini à l'aide d'un modèle de processus opératoire (surgical workflow - SWf). L'assistance porte sur la capture des modèles, l'automatisation de tâches ou encore la gestion des erreurs et des imprévus.<p><p>The main goal of this PhD thesis is to design a computer assisted surgery system based on surgical workflow (SWf) modeling, and intra-operative data and metadata acquired during the operation. For the SWf modeling, workflow-mining techniques will be developed based on dynamic learning and incremental inference. An ontology will be used to describe the various steps of the surgery and their attributes. / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished Informatique générale Sciences de l'ingénieur Surgery -- Data processing Computer-assisted surgery Chirurgie -- Informatique Chirurgie assistée par ordinateur informatique chirurgicale chirurgie assistée par la connaissance Surgical workflow
3	Design of a microcomputer-based open heart surgery patient monitor Brinkman, Karen L. January 1985 (has links) A patient monitor device for use during open heart surgery has been designed and constructed. The device uses a VIC 20 microcomputer along with some additional circuitry to monitor 3 separate functions. The first patient variable monitored is the blood flow rate through the extracorporeal blood circuit during surgery. The device also continuously monitors and displays 6 separate temperatures. Finally, 3 individual timers are monitored and displayed with the device. Both the hardware and the software used in the design are fully described. / Master of Science LD5655.V855 1985.B744 Patient monitoring -- Data processing Heart -- Surgery -- Data processing
4	Modélisation d'un système de navigation chirurgicale pour le traitement par radio-fréquences des tumeurs du foie / Development of a Computer Assisted System aimed at RFA Liver Surgery Mundeleer, Laurent 24 September 2009 (has links) Radiofrequency ablation (RFA) is a minimally invasive treatment for either hepatocellular carcinoma or metastasis liver carcinoma. In order to resect large lesions, the surgeon has to perform multiple time-consuming destruction cycles and reposition the RFA needle for each of them. The critical step in handling a successful ablation and preventing local recurrence is the correct positioning of the needle. For small tumors, the surgeon places the middle of the active needle tip in the center of the tumor under intra-operative ultrasound guidance. When one application is not enough to cover the entire tumor, the surgeon needs to repeat the treatment after repositioning of the needle, but US guidance is obstructed by the opacity stemming from the first RFA application. In this case the surgeon can only rely on anatomical knowledge and the repositioning of the RFA needle becomes a subjective task limiting the treatment accuracy. We have developed a computer assisted surgery guidance application for this repositioning procedure. Our software application handles the complete process from preoperative image analysis to tool tracking in the operating room. Our framework is mostly used for this RFA procedure, but is also suitable for any other medical or surgery application. / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished Informatique générale Sciences de l'ingénieur Computer-assisted surgery Diagnostic imaging Three-dimensional imaging in medicine Surgery -- Data processing Chirurgie assistée par ordinateur Imagerie pour le diagnostic Imagerie tridimensionnelle en médecine Chirurgie -- Informatique recalage Computer Assisted Surgery segmentation radio-fréquences Liver tumors chirurgie mini-invasive tumeurs du foie chirurgie assistée par ordinateur surgical tool tracking registration RFA radio frequency ablation

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