Дисертації з теми "Image guide"
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Goodenow, Daniel P. "A reference guide to JPEG compression /." Online version of thesis, 1993. http://hdl.handle.net/1850/11714.
Повний текст джерелаDean, Chad E. Vosters Nathan P. "Update of the Navy Contract Writing Guide /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FDean%5FMBA.pdf.
Повний текст джерела"MBA professional report"--Cover. Thesis advisor(s): E. Marshall Engelbeck, Jeffrey Cuskey. Includes bibliographical references (p. 19-22). Also available online.
Al-Zoubi, Asem S. "Rectangular dielectric resonator antennas fed by dielectric image guide /." Full text available from ProQuest UM Digital Dissertations, 2008. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1799142881&SrchMode=1&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1257878793&clientId=22256.
Повний текст джерелаTypescript. Vita. "December 2008." Dissertation director: Ahmed A. Kishk Includes bibliographical references (leaves 142-148). Also available online via ProQuest to authorized users.
Dobbs, Andrew L. "A program manager's guide for software cost estimating." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FDobbs.pdf.
Повний текст джерелаKo, Eunbyol. "Music and Image a performer's guide to Maurice Ravel's Miroirs /." Cincinnati, Ohio : University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1172781745.
Повний текст джерелаTitle from electronic thesis title page (viewed Apr.3, 2007). Includes abstract. Keywords: Ravel; Miroirs; Performer's Guide; Image; Impressionism; Symbolism; Eunbyol Ko Includes bibliographical references.
Isbel, Joanne. ""The good friend guide" : a group social skills intervention /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18047.pdf.
Повний текст джерелаPaul, Dominique-Lynda. "Contribution à la modélisation des principaux éléments passifs en technologie guide image." Brest, 1990. http://www.theses.fr/1990BRES2002.
Повний текст джерелаKo, Eunbyol. "Music and Image: A Performer’s Guide to Maurice Ravel’s Miroirs." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1172781745.
Повний текст джерелаToutain, Serge. "Contribution à l'étude du guide image mise en évidence d'ondes à fuites." Lille 1, 1986. http://www.theses.fr/1986LIL10157.
Повний текст джерелаToutain, Serge. "Contribution à l'étude du guide image mise en évidence d'ondes à fuites /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37601616n.
Повний текст джерелаReyt, Ida. "Écoulements induits en guide d'onde acoustique fort niveau." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2292/document.
Повний текст джерелаHigh amplitude acoustic propagation in a guide is associated with several non linear phenomena including acoustic streaming, discontinuity effects and transition to turbulence. Those phenomena are studied in this work and are all associated with acoustically induced flows. The present experimental study therefore is based on velocimetry laser techniques: Laser Doppler Velocimetry (LDV) and Particle Image Velocimetry (PIV), wich are fitted to the measurement of the different flow velocity components. Firstly, PIV measurements at the exit of a convergent enable to complement previous LDV measurements. Then, in order to a better understanding of the specificity of transition to turbulence in acoustics, the evolution of the Stokes boundary layer is studied for increasing acoustic velocity amplitudes. Then an experimental study of acoustic streaming in a square channel is reported, and the influence of the geometry is examined. Moreover, the evolution of acoustic streaming vortices in a cylindrical waveguide is analyzed for fast streaming and some parameters that could control such evolution are modified. The harmonicdistribution inside the guide is changed and then the influence of thermal conditions is studied by coupling velocity measurements and mean temperature measurements inside the waveguide and along the wall. Some comparisons between measured streaming velocities and numerical simulation results are presented
Larsson, Mathias. "Machine vision for finding a joint to guide a welding robot." Thesis, University West, Department of Engineering Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-1783.
Повний текст джерелаThis report contains a description on how it is possible to guide a robot along an edge, by using a camera mounted on the robot. If stereo matching is used to calculate 3Dcoordinates of an object or an edge, it requires two images from different known positions and orientations to calculate where it is. In the image analysis in this project, the Canny edge filter has been used. The result from the filter is not useful directly, because it finds too many edges and it misses some pixels. The Canny edge result must be sorted and finally filled up before the final calculations can be started. This additional work with the image decreases unfortunately the accuracy in the calculations. The accuracy is estimated through comparison between measured coordinates of the edge using a coordinate measuring machine and the calculated coordinates. There is a deviation of up to three mm in the calculated edge. The camera calibration has been described in earlier thesis so it is not mentioned in this report, although it is a prerequisite of this project.
Paquette, Maxime. "La représentation du guide national en France et en Allemagne les cas de Napoléon Bonaparte et d'Adolf Hitler." Mémoire, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/5702.
Повний текст джерелаIturbe, Ion. "Tomographie acoustique haute résolution dans un guide d'onde océanique." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00521540.
Повний текст джерелаMaj, Tomasz. "Interconnection of a 2D vertical-cavity surface-emitting laser array to a receiver array via a fiber image guide." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0034/MQ64236.pdf.
Повний текст джерелаMaj, Tomasz. "Interconnection of a 2D vertical-cavity surface-emitting laser array to a receiver array via a fiber image guide." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30260.
Повний текст джерелаThis thesis examines the implementation of a two-dimensional parallel optical interconnect consisting of an array of Vertical-Cavity Surface-Emitting Lasers (VCSELs), a 1.35m Fiber Image Guide (FIG) and a Metal-Semiconductor-Metal (MSM) receiver array. Coupling issues associated with image guides are analysed and discussed as well as general image guide properties and transmission characteristics. The design, construction and integration aspects of the data link, including optics, electronics and optomechanics are summarised. Characterization results are presented and a transmission rate of 250 Mbit/s per channel is demonstrated with an optical crosstalk of less than -27 dB and a total optical loss of -3dB.
Jiang, Long yu. "Séparation et détection des trajets dans un guide d'onde en eau peu profonde." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00765238.
Повний текст джерелаNording, Adam. "Choosing the colors for a company : A case study on how the right colors can mediate the right image of a company." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-173267.
Повний текст джерелаCedola, Alessia. "Production de faisceaux de rayons-X submicroniques par guide d'onde en couches minces." Université Joseph Fourier (Grenoble ; 1971-2015), 1999. http://www.theses.fr/1999GRE10040.
Повний текст джерелаAulanier, Florian. "Tomographie acoustique océanique en guide d'onde : de l'utilisation des temps à celle des angles." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00934791.
Повний текст джерелаKarsheimer, Emma, and Madelene Svensson. "Effekten av en stjärna : En undersökning om branschutmärkelsers effekter ur ett kundperspektiv." Thesis, Linnéuniversitetet, Institutionen för marknadsföring (MF), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76307.
Повний текст джерелаPurpose and research questions The purpose of this study is to identify possible effects that industry awards might have on consumer awareness, attitude, loyalty and on consumer’s self-image towards a brand. The following research questions are answered through the study: Which effect do industry awards have on brand awareness, brand attitude and brand loyalty? Which effect do industry awards have on the consumer’s self-image? Method This study largely takes on a deductive approach by formulating hypotheses. A survey was conducted with questions based on the theory. The collected data was analyzed through a quantitative as well as a qualitative perspective. The quantitative analysis identified a survey mean which was evaluated against a threshold value. In the qualitative analysis, the significance of the answers was further interpreted and explained. Conclusion According to the results of this study, industry awards do not lead to an increase of brand awareness, positive brand attitudes or an increased brand loyalty. A few of the separate components within the scopes of survey has shown a vague increase. However, according to the result industry awards have a neutral effect. This means that at the same time as no significant increases have been identified, neither have any significant decreases. Furthermore, the results showed that the consumer’s self-image had the lowest effect of industry awards.
Grandidier, Jonathan. "Guide plasmonique polymère-métal : composants passifs et actifs pour la photonique intégrée." Phd thesis, Université de Bourgogne, 2009. http://tel.archives-ouvertes.fr/tel-00441225.
Повний текст джерелаMoroz, Nataliia. "Patrimoines, patrimonialisation, dépatrimonialisation : quelles images et quelles pratiques touristiques pour l'Ukraine ?" Thesis, Lyon, 2020. http://www.theses.fr/2020LYSE2030.
Повний текст джерелаUkraine, as an object and a field of study, has a double challenge, both scientific and operational. This country, remaining still unattractive to European customers for its tourist and heritage resources, wishes to embark on a process of improving its positioning on the tourist market by drawing inspiration from French practices and expertise. This doctoral research therefore has two necessarily interlinked components: firstly, the study and analysis of Ukrainian tourism and heritage systems, and secondly, the proposals based on French know-how, intended to participate in Ukrainian research in this field.The current geopolitical context of the Ukrainian territory since November 2013 and its worsening during the 2014–2015 period has influenced the development and the established areas, but even more in the context of the problems initially posed. That development, initially focused on the strategies of the Ukrainian tourism sector starting from the example of 4 territories including Crimea, in fact was reoriented towards the study of cultural heritage as an Ukrainian tourist resource in order to develop a new tourist segment.Two approaches are used in order to identify points of tourism attraction in Ukraine for foreign tourists and the territorial markers necessary for establishing niche tourism. The first one is to find the means to objectively define the "image" of the country and its territories; the second one is to characterize the heritage elements likely to contribute to better Ukrainian visibility. These approaches have required the relevant delimitation and analysis of several corpuses: travel guides, lists of classified cultural heritage, questionnaires among tourists.Geopolitical changes and tensions in Ukraine have significantly disrupted access to data: some of them have completely disappeared. First of all, there are the tourist statistics of certain regions in tension (Donetsk, Luhansk, Crimea regions). In addition, the lists of classified cultural heritage have undergone transformations following the so-called "de-Sovietization" laws, leading to the abolition of heritage lists from the Soviet period. This "de-patrimonialization" also concerns certain monuments and heritage objects considered as "bearing the ideology of the communist regime". Finally, this difficulty of access to sources that are comparable over time on a national scale, such as official depatrimonialisation movement, has led to a partial repositioning of the research issues, with old and new heritages mobilizing the question of memory and Ukrainian identity in a different way.The diachronic approach used in explaining the tourism and institutional heritage evolutions has been put into perspective over a longer period of time. This is how the exploration and analysis of travel guides since the beginning of the XXth century has made it possible to resituate more widely the representations and discourses relating to tourism and therefore to Ukrainian identity through its heritage.Data representation work - graphs, synoptic tables, maps – has been carried out to better visualize the comparative elements, in their diachrony as well as in their spatializations. It has contributed to a diagnosis highlighting the disparities relating to tourist flows, territorial markers as well as classified heritage objects. These analyses lead to some recommendations for the implementation of niche tourism, centered on the articulation of tourist-heritage offers, based on accessible statistical data, but with a concern for vigilance as to their reliability
Nassif, Marcel. "Méthode de fabrication additive endoscopique par photopolymérisation pour la réparation in-situ de systèmes en espace contraint." Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2684.
Повний текст джерелаThis thesis concerns the study and the development of a novel endoscopic 3D printing process based on photo-polymerization. The idea behind endoscopic 3D printing is to print 3D objects or to repair damaged parts in a dense mechanical assembly without disassembling it. The thesis aims, once the state of the art is studied, to propose solutions adapted to the endoscopic problem, then to model, design, realize and experimentally validate the two main subsystems (UV photo-polymerization through an image guide, resin spraying through a tubular pipe) which, once synchronized, provide the additive printing. Inspired by the vat polymerization method, the liquid resin is transmitted endoscopically and sprayed onto the printing surface (spraying system). Then, a UV pattern, structured by a DMD (Digital Micromirror Device), is transmitted through the image guide and focused onto the printing surface to polymerize a layer of liquid resin. These two steps are repeated several times in order to print layers on top of each other to obtain a 3D part. An endoscopic actuation system (non-integrated translation actuator) allows maintaining the probe at a distance from the printing surface equal to the focal length of the objective of the instrument. In this thesis, the endoscopic UV projection system was designed, modeled, implemented and tested. The design and performances of the optical system were presented in two international conferences. Multilayer objects were fabricated with a layer thickness of 50 μm on a circular printing area of 9.54 mm in diameter. An optical analysis method based on the use of the modulation transfer functions (MTF) was used to test the performance of the endoscopic optical system and to characterize the lateral resolution of the printed parts. Using the MTF method experimentally, a drop in optical resolution due to the image guide was estimated as high as 16 μm compared to the value obtained in the experimental setup containing the same optical components except for the image guide. The lateral resolution of the printed parts was finally limited by the resin (50 μm) and not by the resolution of the optical system. An endoscopic atomization system was also studied, implemented and tested. An endoscopic spraying system was implemented to allow a remote deposition of the resin onto the printing surface. The choice of an air atomization method was adopted. The design, control and realization of the atomization system are presented. Finally, the spraying system was combined with the UV pattern projection system. Preliminary results of printing objects were obtained and 3D parts with a thickness of 0.65 mm are printed (nine layers). Due to a phenomenon called "overspray" (during the spraying process, the resin reaches the printing area and is pushed to the sides by the air pressure that sprays it), the thickness of the layers is not constant between them, but gradually decreases, so the adjustment of the spraying parameters becomes critical. The spraying system still needs to be optimized in order to eliminate overspray and to be able to print uniform layers with a specific thickness. In addition, we have been working on a 2D visualization system but the lack of light on the printing surface prevents us from being able to visualize and control the system. In the future, we propose to spray a resin mixed with a fluorescent dye to make it possible to distinguish the polymerized zones from the uncured zones in each layer of the part
BUENO, REGIS C. "Detecção de contornos em imagens de padrões de escoamento bifásico com alta fração de vazio em experimentos de circulação natural com o uso de processamento inteligente." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26817.
Повний текст джерелаMade available in DSpace on 2016-11-11T13:03:47Z (GMT). No. of bitstreams: 0
Este trabalho desenvolveu um novo método para a detecção de contornos em imagens digitais que apresentam objetos de interesse muito próximos e que contêm complexidades associadas ao fundo da imagem como variação abrupta de intensidade e oscilação de iluminação. O método desenvolvido utiliza lógicafuzzy e desvio padrão da declividade (Desvio padrão da declividade fuzzy - FuzDec) para o processamento de imagens e detecção de contorno. A detecção de contornos é uma tarefa importante para estimar características de escoamento bifásico através da segmentação da imagem das bolhas para obtenção de parâmetros como a fração de vazio e diâmetro de bolhas. FuzDec foi aplicado em imagens de instabilidades de circulação natural adquiridas experimentalmente. A aquisição das imagens foi feita utilizando o Circuito de Circulação Natural (CCN) do Instituto de Pesquisas Energéticas e Nucleares (IPEN). Este circuito é completamente constituído de tubos de vidro, o que permite a visualização e imageamento do escoamento monofásico e bifásico nos ciclos de circulação natural sob baixa pressão.Os resultados mostraram que o detector proposto conseguiu melhorar a identificação do contorno eficientemente em comparação aos detectores de contorno clássicos, sem a necessidade de fazer uso de algoritmos de suavização e sem intervenção humana.
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Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Hristova, Hristina. "Example-guided image editing." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S119/document.
Повний текст джерелаThis thesis addresses three main topics from the domain of image processing, i.e. color transfer, high-dynamic-range (HDR) imaging and guidance-based image filtering. The first part of this thesis is dedicated to color transfer between input and target images. We adopt cluster-based techniques and apply Gaussian mixture models to carry out a more precise color transfer. In addition, we propose four new mapping policies to robustly portray the target style in terms of two key features: color, and light. Furthermore, we exploit the properties of the multivariate generalized Gaussian distributions (MGGD). in order to transfer an ensemble of features between images simultaneously. The multi-feature transfer is carried out using our novel transformation of the MGGD. Despite the efficiency of the proposed MGGD transformation for multi-feature transfer, our experiments have shown that the bounded Beta distribution provides a much more precise model for the color and light distributions of images. To exploit this property of the Beta distribution, we propose a new color transfer method, where we model the color and light distributions by the Beta distribution and introduce a novel transformation of the Beta distribution. The second part of this thesis focuses on HDR imaging. We introduce a method for automatic creation of HDR images from only two images - flash and non-flash images. We mimic the camera response function by a brightness function and we recover details from the flash image using our new chromatic adaptation transform (CAT), called bi-local CAT. That way, we efficiently recover the dynamic range of the real-world scenes without compromising the quality of the HDR image (as our method is robust to misalignment). In the context of the HDR image creation, the bi-local CAT recovers details from the flash image, removes flash shadows and reflections. In the last part of this thesis, we exploit the potential of the bi-local CAT for various image editing applications such as image de-noising, image de-blurring, texture transfer, etc. We propose a novel guidance-based filter in which we embed the bi-local CAT. The proposed filter performs as good as (and for certain applications even better than) state-of-the art methods
Moore, George G. "Guided aerial image analysis." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326332.
Повний текст джерелаBismuth, Vincent. "Algorithmes de traitement d'images pour la visualisation d'outils interventionnels dans des séquence de fluoroscopie par rayons X." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00747682.
Повний текст джерелаHamdan, Iyas. "Multimodal Image Registration in Image-Guided Prostate Brachytherapy." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0002/document.
Повний текст джерелаProstate cancer is the most common cancer in men in France and western countries. It is the third leading cause of death from cancer, being responsible for around 10% of deaths. Brachytherapy, a radiotherapy technique, is associated with a better health-related quality of life after the treatment, compared to other treatment techniques. Prostate brachytherapy involves the implantation of radioactive sources inside the prostate to deliver a localized radiation dose to the tumor while sparing the surrounding healthy tissues. Multi-modal imaging is used in order to improve the overall accuracy of the treatment. The pre-operative Computed Tomography (CT) images can be used to calculate a personalized and accurate dose distribution. During the intervention, the surgeon utilizes a real-time guiding system, Trasnrectal Ultrasound (TRUS), to accurately place the radioactive sources in their desired pre-planned positions. Therefore, if the positions of the sources were determined on CT, they need to be transferred to US. However, a robust and direct US/CT registration is hardly possible since they both provide low soft tissue contrast. Magnetic Resonance Imaging (MRI), on the other hand, has a superior contrast and can potentially improve the treatment planning and delivery by providing a better visualization. Thus, these three modalities (MRI, US and CT) need to be accurately registered. To compensate for prostate deformations, caused by changes in size and form between the different acquisitions, non-rigid registration is essential. Fully automatic registration methodology is necessary in order to facilitate its integration in a clinical workflow. At first, we propose a registration between pre-operative MR and CT images based on the maximization of the mutual information in combination with a deformation field parameterized by cubic B-Splines. We propose to constrain the registration to volumes of interest (VOIs) in order to improve the robustness and the computational efficiency. The proposed approach was validated on clinical patient datasets. Quantitative evaluation indicated that the overall registration error was of 1.15±0.20 mm; which satisfies the desired clinical accuracy. Then, we propose a second intra-operative US/MRI registration, where a multi-resolution approach is implemented to reduce the probability of local minima and improve the computational efficiency. A similarity measure, which correlates intensities of the US image with intensities and gradient magnitude of the MRI, is used to determine the transformation that aligns the two images. The proposed methodology was validated on a prostate phantom at first to assess its feasibility. Subsequently, the method was validated on clinical patient datasets and evaluated using qualitative and quantitative criteria, resulting in a registration error of 1.44±0.06 mm. The approach proposed in this work allows going towards a multimodal protocol for image-guided brachytherapy which can improve the overall accuracy of this procedure. Despite such encouraging results, future work will involve further evaluation on a larger number of datasets in order to assess the reliability and the efficiency of this methodology before integrating it in a clinical workflow
Sdiri, Bilel. "2D/3D Endoscopic image enhancement and analysis for video guided surgery." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCD030.
Повний текст джерелаMinimally invasive surgery has made remarkable progress in the last decades and became a very popular diagnosis and treatment tool, especially with the rapid medical and technological advances leading to innovative new tools such as robotic surgical systems and wireless capsule endoscopy. Due to the intrinsic characteristics of the endoscopic environment including dynamic illumination conditions and moist tissues with high reflectance, endoscopic images suffer often from several degradations such as large dark regions,with low contrast and sharpness, and many artifacts such as specular reflections and blur. These challenges together with the introduction of three dimensional(3D) imaging surgical systems have prompted the question of endoscopic images quality, which needs to be enhanced. The latter process aims either to provide the surgeons/doctors with a better visual feedback or improve the outcomes of some subsequent tasks such as features extraction for 3D organ reconstruction and registration. This thesis addresses the problem of endoscopic image quality enhancement by proposing novel enhancement techniques for both two-dimensional (2D) and stereo (i.e. 3D)endoscopic images.In the context of automatic tissue abnormality detection and classification for gastro-intestinal tract disease diagnosis, we proposed a pre-processing enhancement method for 2D endoscopic images and wireless capsule endoscopy improving both local and global contrast. The proposed method expose inner subtle structures and tissues details, which improves the features detection process and the automatic classification rate of neoplastic,non-neoplastic and inflammatory tissues. Inspired by binocular vision attention features of the human visual system, we proposed in another workan adaptive enhancement technique for stereo endoscopic images combining depth and edginess information. The adaptability of the proposed method consists in adjusting the enhancement to both local image activity and depth level within the scene while controlling the interview difference using abinocular perception model. A subjective experiment was conducted to evaluate the performance of the proposed algorithm in terms of visual qualityby both expert and non-expert observers whose scores demonstrated the efficiency of our 3D contrast enhancement technique. In the same scope, we resort in another recent stereo endoscopic image enhancement work to the wavelet domain to target the enhancement towards specific image components using the multiscale representation and the efficient space-frequency localization property. The proposed joint enhancement methods rely on cross-view processing and depth information, for both the wavelet decomposition and the enhancement steps, to exploit the inter-view redundancies together with perceptual human visual system properties related to contrast sensitivity and binocular combination and rivalry. The visual qualityof the processed images and objective assessment metrics demonstrate the efficiency of our joint stereo enhancement in adjusting the image illuminationin both dark and saturated regions and emphasizing local image details such as fine veins and micro vessels, compared to other endoscopic enhancement techniques for 2D and 3D images
Penney, Graeme. "Registration of tomographic images to X-ray projections for use in image guided interventions." Thesis, King's College London (University of London), 2000. https://kclpure.kcl.ac.uk/portal/en/theses/registration-of-tomographic-images-to-xray-projections-for-use-in-image-guided-interventions(79e28525-ae06-4843-bd75-e1fab126e434).html.
Повний текст джерелаDjordjevic, Milos. "Evaluation of Geometric Accuracy and Image Quality of an On-Board Imager (OBI)." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6967.
Повний текст джерелаIn this project several tests were performed to evaluate the performance of an On-Board Imager® (OBI) mounted on a clinical linear accelerator. The measurements were divided into three parts; geometric accuracy, image registration and couch shift accuracy, and image quality. A cube phantom containing a radiation opaque marker was used to study the agreement with treatment isocenter for both kV-images and cone-beam CT (CBCT) images. The long term stability was investigated by acquiring frontal and lateral kV images twice a week over a 3 month period. Stability in vertical and longitudinal robotic arm motion as well as the stability of the center-of-rotation was evaluated. Further, the agreement of kV image and CBCT center with MV image center was examined.
A marker seed phantom was used to evaluate and compare the three applications in image registration; 2D/2D, 2D/3D and 3D/3D. Image registration using kV-kV image sets were compared with MV MV and MV-kV image sets. Further, the accuracy in 2D/2D matches with images acquired at non-orthogonal gantry angles was evaluated. The image quality in CBCT images was evaluated using a Catphan® phantom. Hounsfield unit (HU) uniformity and linearity was compared with planning CT. HU accuracy is crucial for dose verification using CBCT data.
The geometric measurements showed good long term stability and accurate position reproducibility after robotic arm motions. A systematic error of about 1 mm in lateral direction of the kV-image center was detected. A small difference between kV and CBCT center was observed and related to a lateral kV detector offset. The vector disagreement between kV- and MV-image centers was 2 mm at some gantry angles. Image registration with the different match applications worked sufficiently. 2D/3D match was seen to correct more accurately than 2D/2D match for large translational and rotational shifts. CBCT images acquired with full-fan mode showed good HU uniformity but half fan images were less uniform. In the soft tissue region the HU agreement with planning CT was reasonable while a larger disagreement was observed at higher densities. This work shows that the OBI is robust and stable in its performance. With regular QC and calibrations the geometric precision of the OBI can be maintained within 1 mm of treatment isocenter.
Pace, Aaron J. "Guided Interactive Machine Learning." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1355.pdf.
Повний текст джерелаLindskog, Maria. "Clinical Investigations of Image Guided Radiation Therapy for Prostate Cancer with an On-Board Imager." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8320.
Повний текст джерелаThe daily uncertainty concerning tumor localization is one of the major problems during the course of radiation therapy. Image guided-radiation therapy (IGRT) can be used to improve the localization and adjustment of the planning target volume. The aim of this work was to evaluate both the IGRT technique used for prostate cancer patients at the department of the Karolinska University Hospital and an alternative on-line adaptive radiation therapy (ART) method with an On-Board Imager (OBI).
In the first part of the thesis 2D and 3D image registration with an OBI were compared. Ten prostate cancer patients were involved in the analyses. Two different statistical tests were used to determine significant systematic deviations between the two methods. The second part concerns daily dose verifications and dose plan reoptimization of one intensity modulated radiation therapy (IMRT) prostate cancer patient treated with IGRT. The study was based on cone-beam computed tomography (CBCT) images acquired at 6 different treatment fractions. The risk of developing late rectal and bladder toxicity was quantified using normal tissue complication probability (NTCP) calculations. Additional measurements on an Alderson phantom were performed to verify the accuracy of using the CBCT images for dose calculations.
A statistically significant difference between the 2D-2D and the 3D-3D match applications could be observed in lateral and longitudinal direction. However, the effect differed among the patients. The phantom measurements showed small dose deviations between the CT and CBCT image, with a mean dose increase to the prostate and seminal vesicles (SV) of 2.5 %. The daily dose to the prostate and SV of the IMRT patient showed to be satisfactory. The daily dose to the rectum did not exceed the prescribed rectal dose except at one treatment fraction and the highest risk of developing late rectal toxicity was about 10.4 %. Large daily bladder dose variations were observed and at two treatment fractions the bladder dose restrictions were exceeded. With a reoptimization process of the dose plan, the dose to the bladder could be reduced while conserving the dose to the target.
This work shows that for these specific patient cases appropriate doses to the prostate and SV can be delivered with IGRT. However, introducing a suitable ART method could lead to a reduction of inter-fractional rectal and bladder dose variations.
Barley, Maya. "Bioelectrical strategies for image-guided therapies." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39571.
Повний текст джерелаIncludes bibliographical references (leaves 152-157).
There is a pressing need in minimally-invasive surgery for novel imaging methods that can rapidly and accurately localize the surgical instrument and its target. We have developed two novel localization methods for the guidance of cardiac ablation and other minimally-invasive therapies. The first method, the Inverse Solution Guidance Algorithm (ISGA), is for the non-invasive and rapid localization of the site of origin of an arrhythmia and an ablation catheter tip from body-surface ECG signals. We have substantially developed ISGA to provide accurate catheter guidance even in the presence of significant electrical inhomogeneities, and we have evaluated the method in numerical simulations and phantom studies. Due to the rapidity of arrhythmic origin localization, ISGA may prove a highly effective means of guiding the ablative therapy of hemodynamically-unstable VT. The second method, the Bioelectrical Image Guidance (BIG) Method, is a novel algorithm for the accurate and inexpensive guidance of a wide-range of minimally-invasive surgeries, from cardiac ablation to breast cancer biopsy.
(cont.) The surgical instrument is localized within a detailed 3-D MRI or CT image by applying currents to the body surface and comparing the potentials measured at the instrument tip with potential distributions simulated prior to the surgery. We have developed and evaluated this method in numerical simulations. We have also built an experimental guidance system and tested it in a phantom model. Our results indicate that the BIG Method may one day provide an accurate and convenient means by which to guide minimally-invasive surgery within a highly detailed anatomical image.
by Maya E. Barley.
Ph.D.
Chang, Ping-Lin. "Dense vision in image-guided surgery." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24808.
Повний текст джерелаKochan, Martin. "Enhancing registration for image-guided neurosurgery." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10045247/.
Повний текст джерелаDandekar, Omkar. "High-performance 3D image processing architectures for image-guided interventions." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8096.
Повний текст джерелаThesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Langø, Thomas. "Ultrasound Guided Surgery: Image Processing and Navigation." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-491.
Повний текст джерелаThe need for spectrally efficient transmission on mobile and wireless channels is prevalent. A promising scheme for such transmission is adaptive coded modulation. In this thesis, techniques for assessing the performance of such systems are presented. One of the vulnerable points of such systems is the need for a reliable feedback channel. Channel prediction is proposed as a technique to combat the harmful effects of feedback delay.
The Nakagami distribution is often employed in a model for the fading envelope of a wireless channel; this leads to a gamma-distributed signaltonoise ratio. Nakagami (1960) provides expressions for the probability density function (PDF) of the product, sum, and ratio of two correlated gamma-distributed random variables (RVs). However, such an expression for the difference between two such RVs has not been provided by Nakagami.
A new expression for this PDF is provided in this dissertation, and it is shown that it is closely related to a distribution first described by McKay (1932). Applications of the new PDF include outage probability calculation in an environment with self-interference and assessment of the quality of certain channel estimation techniques.
Langari, Bahareh. "Multi-scale edge-guided image gap restoration." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13406.
Повний текст джерелаClonda, Diego. "Automatic thalamic labeling for image-guided neurosurgery." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/MQ44150.pdf.
Повний текст джерелаMunger, Patrice. "Accuracy considerations in MR image-guided neurosurgery." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22780.
Повний текст джерелаThe means of registering the patient to its image data is then studied, starting with the definition of registration error. Computer simulations of registration by homologous point matching are described along with a clinical study comparing homologous point matching and surface matching registration methods.
A 3-D MR geometrical distortion experiment performed on a stereotactic frame is presented. These measurements demonstrate the discrepancy that can be observed in the geometry of the frame when imaged with differing read-out gradient directions, and quantitatively evaluate the geometrical distortion associated with the image of the frame of known geometry.
Since geometrical distortion of MR images can adversely affect the accuracy of IGNS, the three-point-Dixon MR pulse sequence is evaluated as a means of estimating the magnetic field inhomogeneity, and hence potential geometrical errors in images.
Finally, an experimental comparison of mechanical and optical localizing devices is described, resulting in a quantitative estimate of the precision and accuracy of both systems.
Payne, Janet Susan. "Perceptually guided textural methods for image retrieval." Thesis, Brunel University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422416.
Повний текст джерелаCheng, Chi-yuen Harry, and 鄭致遠. "Image-guided adaptive radiotherapy for nasopharyngeal carcinoma." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47164116.
Повний текст джерелаpublished_or_final_version
Clinical Oncology
Doctoral
Doctor of Philosophy
Williams, Tamara S. (Tamara Shanese) 1976. "Multi-modal registration for image-guided therapy." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86626.
Повний текст джерелаSwanepoel, Petrus Johannes. "Omnidirectional image sensing for automated guided vehicle." Thesis, Bloemfontein : Central University of Technology, Free State, 2009. http://hdl.handle.net/11462/39.
Повний текст джерелаAutomated Guided Vehicles (AGVs) have many different design specifications, although they all have certain design features in common, for instance they are designed to follow predetermined paths, and they need to be aware of their surroundings and changes to their surroundings. They are designed to house sensors for navigation and obstacle avoidance. In this study an AGV platform was developed by modifying an electric wheelchair. A serial port interface was developed between a computer and the control unit of the electric wheelchair, which enables the computer to control the movements of the platform. Different sensors were investigated to determine which would be best suited and most effective to avoid collisions. The sensors chosen were mounted on the AGV and a programme was developed to enable the sensors to assist in avoiding obstacles. An imaging device as an additional sensor system for the AGV was investigated. The image produced by a camera and dome mirror was processed into a panoramic image representing an entire 360o view of the AGV‟s surroundings. The reason for this part of the research was to enable the user to make corrections to the AGV‟s path if it became stuck along the track it was following. The entire system was also made completely wireless to improve the flexibility of the AGV‟s applications.
Volpi, Davide. "New technologies for fluorescence image-guided surgery." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:33c1c1cd-af55-46be-acbe-1181848a799b.
Повний текст джерелаSCHIAPPACASSE, ANDREA. "Intraoperative Navigation Systems for Image-Guided Surgery." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929148.
Повний текст джерелаRungta, Neha S. "Improving error discovery using guided model checking /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1555.pdf.
Повний текст джерелаKruse, Rachel A. "An analysis of Common Missile and TOW 2B using the Janus combat simulation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FKruse%5FRachel.pdf.
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