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Rozprawy doktorskie na temat „Ultrasound”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Boulos, Paul. "Ultrasound imaging of the ultrasound thrombolysis." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1251/document.

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Les techniques de thérapie par ultrasons sont apparues très récemment avec la découverte des ultrasons de haute intensité focalisée. La thrombolyse ultrasonore extracorporelle en fait partie et se base sur la destruction mécanique du thrombus causée par la cavitation acoustique. Cependant, c'est un phénomène mal contrôlé. Ainsi, un meilleur contrôle de l'activité de cavitation et sa localisation pendant la thérapie est essentiel pour considérer le développement d'un dispositif thérapeutique. Un prototype a déjà été conçu et amélioré avec une boucle de rétroaction en temps réel afin de contrôle
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Poggenpoel, Elizabeth J. "Primary obstetric ultrasound : comparing a detail ultrasound only protocol with a booking ultrasound protocol." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4326.

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Mulic-Lutvica, Ajlana. "Postpartum Ultrasound." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7830.

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4

Mercier, Laurence. "Review of ultrasound probe calibration techniques for 3D ultrasound." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81555.

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Three-dimensional (3D) ultrasound is an emerging new technology with numerous clinical applications like measuring the volume of the prostate, monitoring fetal development, or evaluating brain shift during neurosurgery. Ultrasound probe calibration is an obligatory step in order to build 3D volumes from 2D images acquired in a freehand ultrasound system. The role of calibration is to find the transformation that relates the image plane to a sensor attached on the probe. This thesis is a comprehensive review of what has been published in the field of ultrasound probe calibration for 3D u
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Curra, Francesco Pasquale. "Medical ultrasound algorithm for noninvasive high intensity ultrasound applications /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/8006.

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Zhang, Xin. "Etude du vieillissement thermique de revêtements de peinture sur plaque par réflectométrie ultrasonore." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20234.

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La recherche de critères de vieillissement des revêtements de protection sur le long terme est nécessaire dans de nombreuses configurations industrielles. Ce travail présente l'étude de l'évolution de l'élasticité de revêtements de peinture sur plaque métallique par réflectométrie ultrasonore pour détecter de façon non destructive l'endommagement induit lors de tests de vieillissement thermique accéléré. La modélisation du pouvoir réflecteur permet d'identifier, dans une certaine gamme de fréquence, un mode particulier dont la valeur de l'angle critique est préférentiellement sensible à la rig
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Eggebø, Torbjørn Moe. "Ultrasound and labour." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for laboratoriemedisin, barne- og kvinnesykdommer, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11984.

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2.1 Innledning  Alle kvinner ønsker seg en ukomplisert fødsel, men komplikasjoner kan oppstå plutselig og uventet. I følge Verdens Helseorganisasjon trenger 15% av de gravide kyndig hjelp under svangerskap eller fødsel. Før fødselen starter er det viktig å vite hvordan fosteret er orientert i forhold til mor. Leiet vurderes som lengdeleie, tverrleie eller skråleie. Posisjonen beskriver hvordan fosteret er orientert fram, bak, til høyre eller venstre inne i livmoren, og presentasjon beskriver den delen av fosteret som er dypest i fødselskanalen. Nakken til fosteret kan være bøyd (flektert) elle
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8

Mawhinney, Ian Nicholas. "Bone and ultrasound." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335942.

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9

Dhawale, Paritosh Jayant. "Volumetric intracoronary ultrasound." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057677172.

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10

Jeon, Minjee. "Ultrasound—Re:viewing Bodies." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5434.

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A medical evaluation of physical impairment imposes the additional burden of “labeling” the patient with the condition. The binary nature of the normal versus abnormal label emphasizes difference and can lead to trauma. Understanding differences, however, can lead to the generation of new forms and thus, more sensitive differentiation and representation. Tension is created by exploring different bodily forms—a dialectic between form and essence. I am designing a space that visualizes and illuminates difference as a source of trauma and amplifying the tension by comparing figures that represent
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11

Vadalma, Anthony. "Smartphone ultrasound imaging." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/204111/1/Anthony_Vadalma_Thesis.pdf.

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This research project titled 'Smartphone Ultrasound Imaging' aimed to develop an affordable, portable and single handed ultrasound-imaging device to be used in hospitals, developing world nations as well as rural and remote Australia. This study examined the feasibility of combining a conventional smartphone with an ultrasound probe into one single device. All necessary ultrasound signal processing components were built and smartphone applications were developed to successfully transmit data either via Bluetooth or Wi-Fi from the ultrasound to the smartphone.
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12

Boissenot, Tanguy. "Nanocapsules théranostiques pour l’imagerie par IRM-19F et la libération contrôlée par ultrasons." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS078.

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Nous avons développé des nanocapsules théranostiques combinant à la fois une fonction diagnostic d’amélioration de la détection tumorale et une fonction thérapeutique pour les traiter. Ces nanocapsules sont composées d'une enveloppe de polymère de PLGA-PEG et d'un noyau de bromure de perfluorooctyle, un liquide perfluoré, permettant la détection par IRM-19F. Nous avons encapsulé à l’intérieur de ces nanocapsules du paclitaxel, un anticancéreux de la classe des taxanes. L’encapsulation permet de s’affranchir de l’utilisation de Cremophor®, un tensioactif utilisé dans la formulation commerciale
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13

Zheng, Hairong. "Ultrasound contrast agents and their applications for novel ultrasound imaging techniques." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3207695.

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14

Al-Mejrad, Ali Saleh Khalid. "Medical ultrasound : a study of real-time three dimensional ultrasound imaging." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/21190.

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Ultrasonic techniques are very widely applied in medicine. Real-time two dimensional imaging is a technology which is extremely well-suited to medical applications since it enables moving structures to be observed and rapid searching through tissue structures to be performed. Three-dimensional (3D) ultrasonic imaging techniques have been developed but to date there has been very limited success in the development of real-time versions. The aim of this thesis is to study the feasibility of real-time 3D ultrasonic imaging to see if ways can be found to overcome the fundamental problem of sparcit
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15

Saavedra, Bazán Ana Cecilia. "Characterization of healthy skin with high-frequency ultrasound using quantitative ultrasound." Master's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/12471.

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The skin is the largest organ of the body that protects it from the external environment. High- frequency ultra sound (HF-US) has been used to visualize the skin in depth and to diagnose some pathologies in dermatological applications. Quantitative ultrasound (QUS) includes several techniques that provide values of particular physical properties. In this thesis work, three QUS parameters are explained and used to characterize healthy skin through HF-US: attenuation coefficient slope (ACS), backscatter coefficient (BSC) and shear wave speed (SWS). They were estimated with the regularized spectr
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16

Lafond, Maxime. "Confocal Ultrasound for the Potentiation of Chemotherapy by Ultrasonic Cavitation without External Nucleation Agents." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1243/document.

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Le cancer est reconnu comme l'un des principaux enjeux de santé actuels. Même si de grands progrès ont été réalisés dans ce domaine, les effets systémiques des chimiothérapies et le caractère invasif des procédures actuelles de potentialisation (agents physiques) sont autant d'éléments limitants. Les ultrasons se démarquent néanmoins par leur faible morbidité. Appliqués de façon extracorporelle, ils peuvent pénétrer en profondeur dans les tissus et y induire effets thermiques et mécaniques, incluant entre autres la cavitation. La cavitation peut se définir comme la formation et l'oscillation d
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17

Cuxac, Pascal. "Propagation et atténuation des ondes ultrasoniques dans des roches fissurées et anisotropes." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_CUXAC_P.pdf.

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Les recherches présentées dans ce mémoire concernent l'application de la propagation d'ondes ultrasoniques à l'étude de roches fissurées et/ou anisotropes. Ce travail peut être décomposé en quatre grandes parties : la première étape est basée sur l'étude des célérités des ondes compressionnelles et cisaillantes. Celles-ci permettent la détermination des anisotropies des roches aboutissant à une classification selon le degré de symétrie. Cette symétrie impose les directions de propagation et de polarisation nécessaires à la détermination des modules élastiques dynamiques. Un montage dans une ce
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18

Thomas, Gilles. "Design, Optimization and Evaluation of an Extracorporeal Piezoelectric Lithotripter." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1021/document.

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Les lithiases urinaires peuvent affecter le rein, l'uretère ou la vessie, et affectent en moyenne, au moins une fois durant leur vie, 1 personne sur 11 aux Etats-Unis. La lithotritie extracorporelle est une technique largement répandue dans le monde qui consiste à focaliser des ondes de choc acoustiques de haute intensité sur les lithiases afin de les briser. Le travail présenté dans cette thèse porte sur l'optimisation de la lithotritie piézoélectrique, à la fois dans sa conception mais aussi dans son efficacité, tout en réduisant son coût de fabrication. Premièrement, une étude de l'état de
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19

Suomi, Visa. "The feasibility of ultrasound elastography in monitoring high-intensity focused ultrasound therapy." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:1b18e435-43b2-4487-9637-5f8ec79c4aef.

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High-intensity focused ultrasound (HIFU) therapy is a non-invasive therapy method for the treatment of solid tumours. One of the main barriers to wider clinical adoption of HIFU is the lack of reliable and cost-efficient therapy monitoring. One promising technique is acoustic radiation force (ARF) ultrasound elastography, which relies on the temperature dependence of tissue properties to affect displacement amplitudes. An extensive literature review of tissue acoustic, thermal and mechanical properties identified an absence of data on the temperature dependence of the viscoelastic properties.
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20

Londeen, Marika. "Therapeutic Ultrasound: The Effectiveness of Ultrasound and the Importance of Parameter Settings." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/27104.

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Therapeutic ultrasound can be an important modality for clinician's use to heat tissue. Previous research has concluded that therapeutic ultrasound treatments may be ineffective. There are several options for parameters depending on type of treatment and desired goal. The purpose of this study was to determine if specific parameters for a specific desired treatment goal were correct. The parameters included 1.0 and 3.0 megahertz frequencies of continuous ultrasound treatment on 20 subjects. Tissue temperature was measured with thermocouples in the calf. Data analysis consisted of running a one
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21

Griffin, Maura Bernadette. "Ultrasound and cardiovascular risk." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404414.

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22

Schwartz, Benjamin Matthew. "Biometric Navigation with Ultrasound." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10431.

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We have designed and demonstrated a new class of medical navigation methods that use the fingerprint-like biometrically distinct ultrasound echo patterns produced by different locations in tissue. As an example of this new biometric navigation approach, we have constructed and tested a system that uses ultrasound data to achieve prospective motion compensation in MRI, especially for respiratory motion during interventional MRI procedures in moving organs such as the liver. The ultrasound measurements are collated with geometrical information from MRI during a training stage to form a mapping t
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23

Gerold, Bjoern. "Cavitation in focused ultrasound." Thesis, University of Dundee, 2013. https://discovery.dundee.ac.uk/en/studentTheses/f41bf6b9-ae59-4a41-ba29-d5873821418b.

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A novel experimental conguration is developed combining a highintensity focused ultrasound source and a pulsed-laser, for the study of cavitation in a eld typical of those used for therapeutic ultrasound. The sonoptic chamber is specically designed to avoid the formation of acoustic standing waves, known to have a critical in uence on cavitation behaviour. A new technique of laser-nucleated acous- tic cavitation is presented, whereby a laser-pulse of energy below the breakdown threshold for the host medium, acts to nucleate acoustic cavitation in a pre-established eld. This facilitates the inc
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24

Anaya, Demetrio Donald. "Ultrasound-Compatible Cardiac Simulator." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17417571.

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Devices are being developed so that robots can perform cardiac surgery. These robots will steer catheters through a beating heart using image guidance from ultrasound imaging. An appropriate ultrasound-compatible cardiac simulator has been developed in order to test these systems. This simulator mimics the geometry and the complex motion of a beating human heart. The left ventricle phantom is comprised of a soft echogenic material that mimics heart tissue in an ultrasound image. The cardiac simulator will be a useful tool for research and industry applications where testing on an ultrasound co
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Nam, Haewon. "Ultrasound-modulated optical tomography." Texas A&M University, 2002. http://hdl.handle.net/1969/448.

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Bui, Minh Thanh. "Statistical modeling, level-set and ensemble learning for automatic segmentation of 3D high-frequency ultrasound data : towards expedited quantitative ultrasound in lymph nodes from cancer patients." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066146/document.

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Afin d'accélérer et automatiser l'analyse par ultrasons quantitatifs de ganglions lymphatiques de patients atteints d'un cancer, plusieurs segmentations automatiques des trois milieux rencontrés (le parenchyme du ganglion, la graisse périnodale et le sérum physiologique) sont étudiées. Une analyse statistique du signal d'enveloppe a permis d'identifier la distribution gamma comme le meilleur compromis en termes de qualité de la modélisation, simplicité du modèle et rapidité de l'estimation des paramètres. Deux nouvelles méthodes de segmentation basées sur l'approche par ensemble de niveaux et
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Sandoval, Niño Zulma. "Planning and guidance of ultrasound guided High Intensity Focused Ultrasound cardiac arrhythmia therapy." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S044/document.

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L'objectif des travaux présentés dans ce document est de développer de nouvelles méthodes de traitement d'images pour améliorer la planification et le guidage d'une thérapie par voie transœsophagienne de la fibrillation auriculaire à l'aide d'Ultrason Focalisé Haute Intensité. Le document est divisé en deux parties : la planification du traitement et le guidage de la thérapie. Pour la planification de la thérapie, l'idée est d'exploiter l'information acquise au stade préopératoire par un scanner X ou IRM afin de retrouver l'anatomie spécifique du patient et à y définir le futur geste thérapeut
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Lafond, Maxime. "Confocal Ultrasound for the Potentiation of Chemotherapy by Ultrasonic Cavitation without External Nucleation Agents." Electronic Thesis or Diss., Lyon, 2016. http://www.theses.fr/2016LYSE1243.

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Le cancer est reconnu comme l'un des principaux enjeux de santé actuels. Même si de grands progrès ont été réalisés dans ce domaine, les effets systémiques des chimiothérapies et le caractère invasif des procédures actuelles de potentialisation (agents physiques) sont autant d'éléments limitants. Les ultrasons se démarquent néanmoins par leur faible morbidité. Appliqués de façon extracorporelle, ils peuvent pénétrer en profondeur dans les tissus et y induire effets thermiques et mécaniques, incluant entre autres la cavitation. La cavitation peut se définir comme la formation et l'oscillation d
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29

Schöne, Martin. "Possibilities of Articular Cartilage Quantification Based on High-Frequency Ultrasound Scans and Ultrasound Palpation." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21781.

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In der Diagnostik und Reparatur von hyalinem Gelenkknorpel sind neue Methoden zur Quantifizierung von Struktur und mechanischer Belastbarkeit gefragt, um die Behandlung von Knorpelschäden an Millionen von Patienten weltweit zu verbessern. Mittels hochfrequentem, fokussierten Ultraschall werden Oberflächenparameter für Reflektivität und Rauheit an Gelenkknorpel bestimmt. Es wird gezeigt wie die Oberflächenneigung kontrolliert werden kann. Die Ergebnisse vermitteln ein besseres Verständnis über die Zusammensetzung der Ultraschallsignale aus reflektierten und gestreuten Komponenten. 3D Ultrasch
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30

Helbert, Alexandre. "L'imagerie moléculaire de contraste ultrasonore en oncologie : Utilisation des microbulles BR55 ciblant le VEGFR2 dans la détection de l’angiogenèse tumorale, le guidage thérapeutique et l'évaluation de l'efficacité de traitements antiangiogéniques et cytotoxiques." Electronic Thesis or Diss., Lyon, 2022. http://www.theses.fr/2022LYSE1076.

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L’imagerie de contraste ultrasonore a connu un essor considérable ces dernières décennies. Plusieurs agents de contraste ultrasonores, des microbulles de gaz encapsulées, ont été mis sur le marché pour des applications telles que l’imagerie cardio-vasculaire et la radiologie. À la suite de la démonstration de leur efficacité, de nouvelles recherches ont été menées. Une nouvelle génération de microbulles a été développée : les microbulles ciblées. Leur particularité est de contenir, au sein de la membrane, un ligand pouvant se fixer sur des marqueurs vasculaires spécifiques d’une pathologie ; c
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Kabbani, Dania. "Ultrasound-assisted liquefaction of honey." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/144664.

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Crystallization of honey is a common process of the honey industry. Liquid honey is preferred by most of the consumers and by food companies for ease of handling. Honey is commonly heated during pasteurization in order to liquefy it and inhibit any microbial growth. However, heating can degrade the main quality parameters of honey. A better method compared to expensive and time-consuming heating is desirable to pasteurize, accelerate the liquefaction and retard the crystallization process in honey. The present thesis documents the work done at investigating the effect of the ultrasounds (U
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32

Driveklepp, Anders. "Ultrasound Examination of Steel Pipes." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9575.

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<p>Non-intrusive testing of pipelines has become a growing industry, and is expected to keep growing as the demands on quality control and safety keep increasing. In order to meet the oil industry’s demands for pipe monitoring of sub sea pipelines, the SmartPipe project was initiated by SINTEF in Trondheim, Norway. One of the primary objectives of the SmartPipe project is develop a system for in-service monitoring of the pipelines that are placed on the seabed by the offshore oil industry. This thesis presents a very early step in the research required for the development of such a system. T
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Walker, Andrew. "Testing of Doppler Ultrasound Systems." Doctoral thesis, Linköpings universitet, Fysiologisk mätteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51213.

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Blood and tissue velocities are measured and analyzed in cardiac, vascular, and other applications of diagnostic ultrasound. Errors in system performance might give invalid measurements. We developed two moving string test targets and a rotating cylinder phantom (Doppler phantoms) to characterize Doppler ultrasound systems. These phantoms were initially used to measure such variables as sample volume dimensions, location of the sample volume, and the performance of the spectral analysis. Later, specific tests were designed and performed to detect errors in signal processing, causing time delay
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Hergum, Torbjørn. "3D Ultrasound for Quantitative Echocardiography." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for sirkulasjon og bildediagnostikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5937.

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Medical ultrasound imaging is widely used to diagnose cardiacdiseases. The recent availability of real time 3D ultrasound posesseveral interesting challenges and opportunities, and the work of thisthesis is devoted to both challenges and opportunities. One of the key benefits of ultrasound imaging is that its images arereal time. This has been challenged with the recent introduction of 3Dimages, where the number of ultrasound beams is squared compared totraditional 2D images. One common way to alleviate this is byreceiving several closely spaced ultrasound beams from each pulsetransmission, wh
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35

Carlson, Johan. "Multiphase flow measurements using ultrasound." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17175.

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In process industries such as for example the oil and gas industry, the paper pulp industry, and the mining industry, multiphase flows are common. It is often of interest to measure the mass fractions of the different phases. In for example the mining industry, iron ore powder is transported using water, and there is a need of measurement techniques to monitor the particle mass fraction. Most existing techniques are either invasive, inaccurate, or too slow to be used in an on-line manner. The long-term goal of this research project is to develop a method for measuring mass fractions and mass f
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36

Abeysekera, Jeffrey Michael. "Three dimensional ultrasound elasticity imaging." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57462.

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Changes in tissue elasticity are correlated with certain pathological changes, such as localized stiffening of malignant tumours or diffuse stiffening of liver fibrosis or placenta dysfunction. Elastography is a field of medical imaging that characterizes the mechanical properties of tissue, such as elasticity and viscosity. The elastography process involves deforming the tissue, measuring the tissue motion using an imaging technique such as ultrasound or magnetic resonance imaging (MRI), and solving the equations of motion. Ultrasound is well suited for elastography, however, it presents chal
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37

Pong, Mona Wrenn Steven Parker. "Ultrasound and model membrane interaction /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/2520.

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Abeysekera, Jeffrey Michael. "Dual-transducer ultrasound for elastography." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27812.

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Medical imaging techniques provide valuable information about the internal anatomy of the body. Commonly used techniques can render many properties of the anatomy and its function, but they are limited in their ability to measure tissue mechanical properties such as elasticity. Over the past two decades there has been growing interest in developing methods of noninvasively characterizing mechanical properties of tissues; a field commonly referred to as elastography. Tissues are known to exhibit changes in mechanical properties in response to pathology. As a result, elastography has the particu
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Ashab, Hussam Al-Deen. "Ultrasound guidance for epidural anesthesia." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44306.

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We propose an augmented reality system to automatically identify lumbar vertebral levels and the lamina region in ultrasound-guided epidural anesthesia. Spinal needle insertion procedures require careful placement of a needle, both to ensure effective therapy delivery and to avoid damaging sensitive tissue such as the spinal cord. An important step in such procedures is the accurate identification of the vertebral levels, which is currently performed using manual palpation with a reported success rate of only 30%. In this thesis, we propose a system using a trinocular camera which tracks an ul
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Beadle, Brad Michael. "Fiber optic sensor for ultrasound." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17869.

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Beadle, Brad Michael. "Fiber optic sensor for ultrasound." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19173.

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Mercier, Laurence. "Ultrasound-guided brain tumor resection." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107629.

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Malignant gliomas are the most common type of primary brain tumors in adults. Contrarily to brain metastases that have clear borders, malignant gliomas are poorly circumscribed lesions because they diffusely infiltrate the brain parenchyma. When possible, standard treatment of gliomas includes surgical resection, though surgeons unintentionally leave behind some of the tumor more than 50% of the time. Two factors are mainly responsible for this situation. First, most current neuronavigation systems are based on preoperative images; these systems become less accurate as the surgery progresses
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Zayat, Ahmed Salem. "Confounding factors in musculoskeletal ultrasound." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574628.

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Musculoskeletal ultrasound (US) is an imaging modality with the potential to revolutionise the way we practise rheumatology. Ultrasound has been shown to be more sensitive and valid when compared to conventional imaging methods and clinical examination in the assessment of inflammatory arthropathies (lA). However, major limitations to its widespread use have been its perceived poor reliability and unknown diagnostic discriminative ability. Image acquisition is a key point for improving reliability. A systematic literature review was performed and a survey of experts was obtained in order to un
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Dance, C. R. "Computing models from 3D ultrasound." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598263.

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The computation of geometric models is a central task in imaging science, but it has only been attempted recently for 3D ultrasound. This thesis considers the case of 3D <I>free-hand</I> ultrasound in which a position sensor is attached to a conventional 2D probe. This is an inexpensive, safe and portable technique. However, ultrasound images typically have lower resolutions than images obtained by other clinical modalities and they contain spatially correlated <I>speckle </I>noise. Furthermore, the position and orientation information available is non-ideal and image planes may be irregularly
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Housden, R. J. "Clinically practical freehand 3D ultrasound." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604263.

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In this thesis, various alternatives to standard sensor systems are developed, with particular emphasis on improving the practicality of freehand 3D ultrasound in a clinical environment. The novel algorithms presented here are able to position a sequence of image frames qualitatively correctly even when the direction of out-of-plane motion is allowed to vary, which was not previously possible. Existing work on the subject of six-degree-of-freedom sensorless reconstruction found that it is possible to take unbiased measurements from a sensorless reconstruction, provided it is constrained to hav
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Hsu, P. W. "Freehand three- dimensional ultrasound calibration." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604687.

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In this thesis, we investigate how to achieve an accurate reliable and rapid probe calibration. Our first step is to improve the reliability of an accurate calibration technique from the literature. The Cambridge phantom, a variant of plane-based calibration, has been shown to be one of the most accurate calibration techniques. Unfortunately, calibrations performed using plane-based techniques are often unreliable. We show how it is possible to provide feedback on the reliability of the calibration. This allows the user to rectify an unreliable calibration. Having achieved an accurate and reli
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Choi, Doowon. "Ultrasound propagation in various gases." Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250087.

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Silva-Martinez, Susana. "Applications of ultrasound in electrochemistry." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242670.

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Gilbertson, Matthew Wright. "Handheld force-controlled ultrasound probe." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/63232.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 129-131).<br>An hand-held force controlled ultrasound probe has been developed. The controller maintains a prescribed contact force between the probe and a patient's body. The device will enhance the diagnostic capability of free-hand elastography, swept-force compound imaging, and make it easier for a technician to acquire repeatable (i.e. directly comparable) images over time. The mechanical system consists of an ultr
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Koegelenberg, Coenraad Frederik Nicolaas. "Ultrasound-assisted transthoracic diagnostic techniques." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/18054.

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Thesis (PhD)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Although transthoracic ultrasonography is a well established modality, it is still underutilised by chest physicians. The aim of this research project was to investigate the feasibility, diagnostic yield and safety of ultrasound(US)-assisted transthoracic biopsies performed by clinicians in various settings relevant to daily practice of respiratory medicine. We conducted four clinical trials which are summarised below: 1. In a prospective study on the feasibility of US-assisted transthoracic fine needle aspiration (TTFN
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