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Thèses sur le sujet « Images treatment »

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Auteur : Grafiati
Publié le 27 juillet 2024
Mis à jour le 28 juillet 2024

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1

Tuncer, Ozgur. « Segmentation, Registration And Visualization Of Medical Images For Treatment Planning ». Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1093368/index.pdf.

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Medical imaging has become the key to access inside human body for the purpose of diagnosis and treatment planning. In order to understand the effectiveness of planned treatment following the diagnosis, treated body part may have to be monitored several times during a period of time. Information gained from successive imaging of body part provides guidance to next step of treatment. Comparison of images or datasets taken at different times requires registration of these images or datasets since the same conditions may not be provided at all times. Accurate segmentation of the body part under treatment is needed while comparing medical images to achieve quantitative and qualitative measurements. This segmentation task enables two dimensional and three dimensional visualizations of the region which also aid in directing the planning strategy. In this thesis, several segmentation algorithms are investigated and a hybrid segmentation algorithm is developed in order to segment bone tissue out of head CT slices for orthodontic treatment planning. Using the developed segmentation algorithm, three dimensional visualizations of segmented bone tissue out of head CT slices of two patients are obtained. Visualizations are obtained using the MATLAB Computer software&
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s visualization library. Besides these, methods are developed for automatic registration of twodimensional and three-dimensional CT images taken at different time periods. These methods are applied to real and synthetic data. Algorithms and methods used in this thesis are also implemented in MATLAB computer program.
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2

Bazalova, Magdalena. « The use of computed tomography images in Monte Carlo treatment planning ». Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32513.

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Monte Carlo (MC) dose calculations cannot accurately assess the dose delivered to the patient during radiotherapy unless the patient anatomy is well known. This thesis focuses on the conversion of patient computed tomography (CT) images into MC geometry files. Metal streaking artifacts and their effect on MC dose calculations are first studied. A correction algorithm is applied to artifact-corrupted images and dose errors due to density and tissue mis-assignment are quantified in a phantom and a patient study. The correction algorithm and MC dose calculations for various treatment beams are also investigated using phantoms with real hip prostheses. As a result of this study, we suggest that a metal artifact correction algorithm should be a part of any MC treatment planning. By means of MC simulations, scatter is proven to be a major cause of metal artifacts. The use of dual-energy CT (DECT) for a novel tissue segmentation scheme is thoroughly investigated. First, MC simulations are used to determine the optimal beam filtration for an accurate DECT material extraction. DECT is then tested on a CT scanner with a phantom and a good agreement in the extraction of two material properties, the relative electron density rho_e and the effective atomic number Z is found. Compared to the conventional tissue segmentation based on rho_e-differences, the novel tissue segmentation scheme uses differences in both rho_e and Z. The phantom study demonstrates that the novel method based on rho_e and Z information works well and makes MC dose calculations more accurate. This thesis demonstrates that DECT suppresses streaking artifacts from brachytherapy seeds. Brachytherapy MC dose
Les calculs de dose Monte Carlo (MC) ne peuvent précisément déterminer la dose délivrée au patient, à moins de bien connaître son anatomie. Cette thèse se concentre sur la conversion des images tomographiques du patient en fichier de géométrie Monte Carlo. Les artefacts métalliques et leur effet sur les calculs de dose MC sont étudiés. Un algorithme de correction est appliqué sur les images avec artefacts et les erreurs de dose dues au mauvais assignement des densités et tissus sont quantifiées dans un fantôme et une étude de patient. L'algorithme de correction est aussi testé sur des fantômes avec de réelles prothèses de hanches et l'effet de correction sur les calculs de dose MC est étudié. En tant que résultat de cette étude, nous suggérons qu'un algorithme de correction des artefacts métalliques soit intégré à tout plan de traitement MC. Par le biais de simulations MC, le diffusé est prouvé être une cause majeure des artefacts métalliques. L'utilisation d'un scanner double énergie pour une méthode novatrice de segmentation de tissu est minutieusement étudiée. Tout d'abord, les simulations MC sont utilisées pour déterminer la filtration optimale de faisceau pour une extraction précise du matériau en scanner double énergie. La méthode à double énergie est ensuite testée sur un scanner avec un fantôme et un bon accord dans l'extraction des propriétés des deux matériaux, la densité électronique relative rho_e et le nombre effectif atomique Z est trouvé. Comparé à la segmentation conventionnelle des tissus réalisée sur la base des différents rho_e, la méthode novatrice de segmentation de tissu utilise les diff
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3

Akhtari, Mohammad Mehdi. « Accuracy of inverse treatment planning on computed tomography like images derived from magnetic resonance data ». Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-68721.

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Treatment planning for radiotherapy involves different types of imaging to delineate target volume precisely. The most suitable sources to get 3D information of the patient are the computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography (PET)/CT modalities. CT is a modern medical imaging technique that allows three-dimensional treatment planning and conformal treatment techniques. By combining CT images with efficient dosimetry software, accurate patient positioning methods and verification and quality assurance good results can be achieved. The CT images show how the radiation interacts with the material based on each tissue has a different attenuation coefficient, so the data can be used for dose calculations in treatment planning. Radiation oncology is therapeutic modality, in which irradiating cancer cells as target is the main goal while always try to limit the dose to healthy tissues and organs. CT images have good potentials because they can provide high geometrical accuracy and electron density information. Having said that, however, using CT images alone for planning does not provide enough information in order to delineate the target volume accurately because the attenuation in soft tissue is fairly constant therefore the soft tissue contrast is poor. Here, (MR) imaging can be very useful since it has superior soft tissue contrast especially in conditions such as prostate cancer, brain lesions, and head and neck tumors. It should be noted that MR images cannot provide electron density information that is required for dose calculations. It has been hypothesized that since MRI images have certain benefits in comparison with CT images such as its superior soft tissue contrast which improves contrast resolution between different types of tissues, it would be beneficial to use MRI alone for both target delineation and treatment planning to save time and costs. This was investigated by introducing substitute computed tomography (SCT) which can be interpreted as CT equivalent information obtained by MRI images. We used data from five patients with intracranial tumors, and reviewed their initial dosimetric treatment plans that were based solely on CT images, that data was also used to evaluate the dosimetric accuracy of our research treatment plans. Optimization plans that are based on CT images and substitute CT (SCT) was compared with each other in the first step. On the second step the treatment plan that was based on SCT images was transferred to the CT images without any changes and comparisons between the dose calculations on both data sets were made. The delivered dose to planning target volume (PTV) and risk organs was compared. Gamma index results between SCT and transferred plan showed no difference in the dose distribution map in PTV. The maximum difference was in the outer contour to the skull. The average and median dose delivered to PTV was within 0.35% difference studying in all patients. In conclusion for patients with intracranial tumors the dosimetric accuracy of treatment plans based on SCT and MR images were very accurate, and we demonstrated that it was possible to reach the same dose volume histograms by SCT compared to CT with minimal differences, which were not significant.
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4

FINOTELLO, ALICE. « Vascular remodeling after endovascular treatment : quantitative analysis of medical images with a focus on aorta ». Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/943023.

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In the last years, the convergence of advanced imaging techniques and endovascular procedures has revolutionized the practice of vascular surgery. However, regardless the anatomical district, several complications still occur after endovascular treatment and the impact of endovascular repair on vessel morphology remains unclear. Starting from this background, the aim of this thesis is to ll the gaps in the eld of vessel remodeling after endovascular procedure. Main focus of the work will be the repair of the aorta and, in particular thoracic and thoracoabdominal treatments. Furthermore an investigation of the impact of endovascular repair on femoro-popliteal arterial segment will be reported in the present work. Analyses of medical images will been conducted to extract anatomical geometric features and to compare the changes in morphology before treatment and during follow-up. After illustrating in detail the aims and the outline of the dissertation in Chapter 1, Chapter 2 will concern the anatomy and the physiology of the aorta along with the main aortic pathologies and the related surgical treatments. Subsequently, an overview of the medical image techniques for segmentation and vessel geometric quantication will be provided. Chapter 3 will introduce the concept of remodeling of the aorta after endovascular procedure. In particular, two types of aortic remodeling will be considered. On one side remodeling can be seen as the shrinkage of the aneurysmal sac or false lumen thrombosis. On the other side, aortic remodeling could be seen as the changes in the aortic morphology following endograft placement which could lead to complications. Chapter 4 will illustrate a study regarding the analysis of medical images to measure the geometrical changes in the pathological aorta during follow-up in patients with thoracoabdominal aortic aneurysms treated with endovascular procedure using a novel uncovered device, the Cardiatis Multilayer Flow Modulator. Chapter 5 will focus on the geometrical remodeling of the aortic arch and descending aorta in patients who underwent hybrid arch treatment to treat thoracic aneurysms. The goal of the work is to develop a pipeline for the processing of pre-operative and post-operative Computed Tomography images in order to detect the changes in the aortic arch physiological curvature due to endograft insertion. Chapter 6 will focuse on the use of 3D printing technology as valuable tool to support patient's follow-up. In particular, we report a case of a patient originally treated with endovascular procedure for type B aortic dissection and which experimented several complications during follow-up. 3D printing technology is used to show the remodeling of the aortic vasculature during time. Chapter 7 will concern patient-specic nite element simulations of aortic endovascular procedure. In particular, starting from a clinical case where complication developed during followup, the predictive value of computational simulations will be shown. Chapter 8 will illustrate a study concerning the evaluation of morphological changes of the femoro-popliteal arterial segment due to limb exion in patients undergoing endovascular treatment of popliteal artery aneurysms.
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5

Sperling, Nicholas Niven. « A Novel Algorithm for the Reconstruction of an Entrance Beam Fluence from Treatment Exit Patient Portal Dosimetry Images ». University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1384521982.

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6

McCowan, Peter Michael. « in vivo patient dose verification of volumetric modulated arc therapy including stereotactic body radiation treatment applications using portal dose images ». Medical Physics, 2015. http://hdl.handle.net/1993/31120.

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The complexity of radiation therapy delivery has increased over the years due to advancements in computing and technical innovation. A system of dose delivery verification has the potential to catch treatment errors and therefore improve patient safety. The goal of this thesis was to create a portal image-based in vivo dose reconstruction model for volumetric modulated arc therapy (VMAT) deliveries, specifically for stereotactic body radiation therapy (SBRT). This model-based approach should be robust and feasible within a clinical setting. VMAT involves the modulation of dose rate, gantry speed, and aperture shaping while the treatment gantry (i.e., x-ray beam) rotates about the patient. In this work, portal images were acquired using an amorphous silicon electronic portal imaging device (a-Si EPID). A geometrical characterization of the linear accelerator (linac) during VMAT delivery was performed. An angle adjustment method was determined which improves each EPID’s angular accuracy to within ±1° of the true physical angle. SBRT delivers large doses over fewer fractions than conventional radiotherapy, therefore, any error during an SBRT delivery will have a greater impact on the patient. In this work, a robust, model-based SBRT-VMAT dose reconstruction verification system using EPID images was developed. The model was determined to be clinically feasible. The accuracy of a 3D in vivo dose reconstruction, using all the EPID images acquired during treatment, is sensitive to the chosen frame averaging per EPID image: the greater the frame averaging, the larger the reconstruction error. Optimization of the EPID frame averaging number as a function of average linac gantry speed and dose per fraction were determined. The EPID-based in vivo dose reconstruction model for SBRT-VMAT developed here was determined to be robust, accurate, and clinically feasible as long as adjustments were made in order to correct for EPID image geometrical errors and frame-averaging errors.
May 2016
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7

Abdallah, Zeinab. « Reconstruction 3D de microlentilles à partir d'images au microscope électronique à balayage ». Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALS010.

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Les défis de la métrologie 3D pour les objets microscopiques au sein de l'industrie microélectronique sont abordés, en se concentrant particulièrement sur les nœuds avancés et les dispositifs "more-than-moore". La Microscopie Électronique à Balayage (MEB), utilisant les électrons secondaires émis en surface (SE), est employée dans une stratégie de métrologie 3D rapide et non destructive impliquant la création de structures ressemblant à des microlentilles sur des plaquettes de 300 nm à l'aide de la lithographie en niveaux de gris avec une "i-line lithography". L'outil MEB, doté d'un agencement de détecteurs multiples comprenant un détecteur SE à quatre quadrants, ainsi que des mesures simultanées de Microscopie à Force Atomique (AFM), est utilisé pour le co-enregistrement et l'élimination du bruit de fond des deux ensembles de données. L'exploration approfondie de la métrologie MEB dans cet agencement spécifique de détecteurs comprend des investigations approfondies sur divers modèles analytiques, affinant la compréhension de leur adaptabilité et de leur efficacité. Le modèle analytique de MEB, crucial pour l'étalonnage du détecteur et la reconstruction paramétrique, surmonte les limitations initiales grâce à une pondération d'image orientée par quadrant, mettant en valeur son utilité et sa validité. Des contributions significatives sont apportées à l'avancement de la métrologie des objets microscopiques, répondant aux besoins critiques de l'industrie microélectronique
Challenges in 3D metrology for microscopic objects within the microelectronics industry are addressed, particularly focusing on advanced nodes and "more-than-moore" devices. Scanning Electron Microscopy (SEM), employing surface-emitted Secondary Electrons (SE), is utilized in a rapid and non-destructive 3D metrology strategy involving the creation of microlens-like structures on 300 nm wafers using grayscale i-line lithography. The SEM tool, featuring a multiple-detector arrangement, including a four-quadrant SE detector, along with simultaneous Atomic Force Microscopy (AFM) measurements, is employed for co-registration and background elimination from both datasets. The thorough exploration of SEM metrology within this specific detector arrangement includes in-depth investigations into various analytical models, refining the understanding of their adaptability and efficiency. The analytical SEM model, crucial for detector calibration and parametric reconstruction, overcomes initial limitations through quadrant-oriented image weighting, showcasing its utility and validity. Significant contributions are made to advancing microscopic object metrology, addressing critical needs in the microelectronics industry
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8

Verguet, Amandine. « Développements méthodologiques et informatiques pour la microscopie électronique en transmission appliqués à des échantillons biologiques Alignment of Tilt Series (Chapter 7 of the Book : Cellular Imaging : Electron Tomography and Related Techniques, Hanssen Eric) An ImageJ tool for simplified post-treatment of TEM phase contrast images (SPCI) Comparison of methods based on feature tracking for fiducial-less image alignment in electron tomography ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS487.

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La microscopie électronique en transmission est une technique pertinente pour les études structurales en biologie. Certaines méthodes d’acquisition et d’analyse doivent être améliorées pour permettre l’observation d’échantillons sensibles aux doses d’électrons dans de bonnes conditions de contraste et de rapport signal sur bruit. Au cours de cette thèse, j’ai exploré différentes approches méthodologiques et informatiques dans le but d’améliorer la qualité des images. J’ai ainsi évalué la pertinence de la combinaison de l’imagerie en énergie filtrée avec le mode STEM. Je montre que cette combinaison est prometteuse puisqu’elle permet d’améliorer le rapport signal sur bruit des images. Par ailleurs, j’ai collaboré à des développements algorithmiques et logiciels pour la reconstitution d’images de contraste de phase. Ceci permet l’amélioration du contraste par rapport à une acquisition classique. Je montre aussi qu’à cette fin, la phase plate tout comme les séries focales sont des outils efficaces. En étudiant une approche logicielle pour l’exploitation des séries focales, nous avons déterminé qu’il est possible d’obtenir, en plus de données quantitatives, un résultat qualitatif à partir d’une seule image. J’ai ainsi développé le plugin SPCI pour le logiciel ImageJ, qui permet de traiter de une à trois images focales. Je m’intéresse également à l’optimisation du processus de reconstruction tomographique, tant à l’alignement qu’à la reconstruction proprement dite. L’approche évaluée pour l’alignement utilise des points caractéristiques associés à des descripteurs locaux. Elle s’est montrée performante et permet de traiter des images sans marqueurs fiduciaires. Enfin, je propose une nouvelle méthode unifiée de reconstruction tridimensionnelle de séries tomographiques parcimonieuses. Il en découle une approche innovante mélangeant reconstruction et alignement dont l’ébauche servira de base à des travaux futurs pour le traitement de séries tomographiques parcimonieuses. L’ensemble des méthodes évoquées ici, leur validation, ainsi que les perspectives d’évolution associées sont décrites dans ce manuscrit
Transmission Electron Microscopy is a major tool for performing structural studies in biology. Some methods used for image sampling and analysis need to be improved in order to observe electron dose sensitive samples with good contrast and good signal to noise ratio. During this thesis, various methodological and computational approaches have been studied which aim to improve image quality. First, I evaluated the relevance of combining energy filtered imaging with the STEM mode. I show that this allows an improvement of the signal to noise ratio of images. Then, I devised an algorithm that generates an image from phase data. This approach allows improving the image contrast over direct imaging. The use of a phase plate and focal tilt series are both efficient tools to achieve this goal. While working on the software approach for processing of tilt series, we found that a qualitative result can be obtained from a single image. I developped the SPCI plugin for the ImageJ software. It allows processing between one and three focal images. My work involves optimization of the tomographic reconstruction process, including working with both alignment algorithms and reconstruction algorithms. I expose my studies on image alignment methods used on tilt series. These methods do rely on the use of key points and associated local descriptors. They have proved to be efficient to process images lacking fiducial markers. Finally, I propose a new unified algorithmic approach for 3D reconstruction of tomographic tilt series acquired with sparse sampling. I then derived another novel method that integrates the image alignment step in the process. Studies and developments will continue on both methods in futur work
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Woodward, Rana M. « Treatment of specific phobia in older adults : efficacy and barriers to treatment / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19051.pdf.

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10

Money, Tyler. « Adolescent girls' perception of change in residential treatment centers : a qualitative study of how treatment works / ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2253.pdf.

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11

Mitchell, Geoffrey Keith. « The effect of case conferences between general practitioners and palliative care specialist teams on the quality of life of dying people / ». [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18557.pdf.

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12

Corcoran, R. J. « Fruit fly (Diptera:Tephritidae) responses to quarantine heat treatment / ». St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16489.pdf.

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13

Nelsen, Tyler. « Performance of concrete bridge deck surface treatments / ». Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd810.pdf.

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Paterson, David L. « Extended-spectrum beta-lactamase producing bacteria : epidemioloyg, characterisation, detection and treatment / ». [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe.pdf.

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Lewis, Amanda Gloria. « Treatment of Hypertriglyceridemia with Omega-3 Fatty Acids : A Systematic Review ». Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd458.pdf.

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Viney, Kerri. « Universal or selective directly observed treatment ? : a clinical audit of directly observed treatment and tuberculosis in a North-East London (United Kingdom) cohort / ». St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17920.pdf.

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Malcarne, Brian K. « Constructive Enabling : Applying a Wilderness Skills Intervention to Support the Therapeutic Change Process of Adolescent Females in Residential Treatment ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2228.pdf.

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Griner, Derek. « Culturally adapted mental health treatments : a meta-analysis / ». Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1796.pdf.

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19

Raylu, Namrata N. « Testing a cognitive behavioural theory and treatment of problem gambling / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18390.pdf.

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Penteado, Marcos Roberto Mendes 1985. « Transporte de grãos por leito móvel em um escoamento turbulento : deslocamento de grãos individuais ». [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265832.

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Orientador: Erick de Moraes Franklin
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-26T21:46:41Z (GMT). No. of bitstreams: 1 Penteado_MarcosRobertoMendes_M.pdf: 9443939 bytes, checksum: ee4e74d0df7e1ec320410dcc330c86e3 (MD5) Previous issue date: 2015
Resumo: O transporte de sedimentos por um fluido é frequentemente encontrado em rios, oceanos, escoamentos periglaciais e outros processos naturais. É também encontrado na indústria, tal como em linhas de petróleo que arrastam sedimentos, em sistemas de esgotos e em processos de dragagem, por exemplo. Nessa dissertação, o transporte de grãos em um leito granular cisalhado pelo escoamento de um líquido será investigado experimentalmente. Nos experimentos, um escoamento de água turbulento totalmente desenvolvido foi imposto sobre o leito granular de geometria conhecida. Sob as condições testadas, os grãos foram transportados como leito móvel (\textit{bed load}, em inglês), i.e., sedimentos são transportados rolando ou deslizando sobre o leito. Para diferentes vazões de água, os deslocamentos dos grãos são filmados por uma câmera rápida. Os deslocamentos e campos de velocidade dos grãos foram determinados através do tratamento das imagens. A taxa de transporte dos grãos foi então estimada e correlacionada com o escoamento do fluido
Abstract: Sediment transport by a fluid flow is frequently found in rivers, oceans, periglacial flows and other natural processes. It is also commonly found in industry, such as in petroleum pipelines conveying grains, in sewer systems and in dredging lines, for example. In this thesis, the transport of grains of a granular bed sheared by a liquid flow was experimentally investigated. In the experiments, fully-developed turbulent water flows were imposed over a granular bed of known granulometry. Under the tested conditions, the grains were transported as bed load, i.e., sediment was carried by rolling and sliding over the bed. For different water flow rates, the displacements of grains were filmed by a high-speed camera. The grains displacement and velocity fields were determined by post-processing the images. The bed-load transport rate was estimated and correlated to the water flow conditions
Mestrado
Termica e Fluidos
Mestre em Engenharia Mecânica
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21

Jorgensen, Anna Mae. « Familial predictors of long-term outcome following inpatient treatment for eating disorders / ». Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3086.pdf.

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Maude, Sarah Jane. « Factors affecting the performance of seed treatment suspension concentrates ». Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289562.

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Bercier, Yanic. « Image fusion for radiosurgery treatments of arteriovenous malformations ». Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82830.

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An interactive 3D target localisation and delineation tool has been developed for radiosurgery planning of arteriovenous malformations (AVMs). With this system, magnetic resonance (MR), MR angiography (MRA) and computed tomography (CT) volumes can be fused in stereotactic space. Stereotactic angiography (SA) images can be linked to the MRA volume by recovering the SA acquisition geometry. The MRA and SA images can be correlated (1) by ray-tracing through the MRA volume with the recovered SA acquisition geometry and overlaying the images onto the SA images and (2) by localising the AVM onto a volume rendered representation of the MRA with a 3D cursor and projecting its position onto the SA images. Target contours can then be drawn on the MRA/MR/CT images and simultaneously projected onto the SA images.
The plans of patients who had previously undergone radiosurgery at our institution employing SA images for localisation and MR images for delineation were investigated. MRA datasets were also acquired at the time of MR scanning employing the 3D TOF technique. Some ray-traced MRA images correlated well visually with the SA images, others presented inconsistencies which suggest that MRA should be used only as complement to SA images.
The role of the different modalities (M-RA, MR and SA) in the definition of target volumes is investigated by defining the target contours with different combinations of modalities within the interactive system. The target volumes drawn with different modalities were compared to a reference volume, drawn using MRA, MR and SA images, and presented underestimation and overestimation of target volumes ranging from 20% to 92% and from 3% to 40%.
The dosimetric implications of image fusion for target delineation are investigated by retrospective evaluation of the dose coverage of the reference target volume by the original treatment plan. Target coverage inferior to 60% of the reference target volumes by the original treatment plans was obtained for the patients. Treatment plan optimisation was performed to evaluate the possible dosimetric improvements resulting from image fusion for AVM target delineation. The plans were improved by employing three, eight and four isocentres for the 3 patients, and resulted in target coverage equal or superior to 98% for all three patients.
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Lennox, James. « Multivariate subspaces for fault detection and isolation : with application to the wastewater treatment process / ». [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16704.pdf.

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Annavarjula, Vaishnavi. « Computer-Vision Based Retinal Image Analysis for Diagnosis and Treatment ». Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14979.

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Context- Vision is one of the five elementary physiologial senses. Vision is enabled via the eye, a very delicate sense organ which is highly susceptible to damage which results in loss of vision. The damage comes in the form of injuries or diseases such as diabetic retinopathy and glaucoma. While it is not possible to predict accidents, predicting the onset of disease in the earliest stages is highly attainable. Owing to the leaps in imaging technology,it is also possible to provide near instant diagnosis by utilizing computer vision and image processing capabilities. Objectives- In this thesis, an algorithm is proposed and implemented to classify images of the retina into healthy or two classes of unhealthy images, i.e, diabetic retinopathy, and glaucoma thus aiding diagnosis. Additionally the algorithm is studied to investigate which image transformation is more feasible in implementation within the scope of this algorithm and which region of retina helps in accurate diagnosis. Methods- An experiment has been designed to facilitate the development of the algorithm. The algorithm is developed in such a way that it can accept all the values of a dataset concurrently and perform both the domain transforms independent of each other. Results- It is found that blood vessels help best in predicting disease associations, with the classifier giving an accuracy of 0.93 and a Cohen’s kappa score of 0.90. Frequency transformed images also presented a accuracy in prediction with 0.93 on blood vessel images and 0.87 on optic disk images. Conclusions- It is concluded that blood vessels from the fundus images after frequency transformation gives the highest accuracy for the algorithm developed when the algorithm is using a bag of visual words and an image category classifier model. Keywords-Image Processing, Machine Learning, Medical Imaging
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Chan, Arthur Ho-Yin. « Image-guided high intensity focused ultrasound treatment for uterine leiomyomata / ». Thesis, Connect to this title online ; UW restricted, 2003. http://hdl.handle.net/1773/8068.

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Plowman, Suzanne F. « Self-esteem as a predictor of treatment outcome among women with eating disorders / ». Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd1903.pdf.

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Birdsall, Aimee Worthen. « Effect of initial surface treatment timing on chloride concentrations in concrete bridge deck / ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1695.pdf.

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Holmes, Jane M. « A comparion of clinic versus internet administered treatment of childhood anxiety / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18671.pdf.

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Aung-Kyaw-Zaw. « Utilisation and cost of malaria treatment in Shan state, Myanmar, 2000 / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19082.pdf.

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Cozzi, Sarah-Jane. « Molecular targets of anticancer PKC activators in the treatment of melanoma / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19185.pdf.

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Bond, Sarah Louise. « Image analysis for patient management in colorectal cancer ». Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:3f810bd0-2645-420c-9d91-169d7605b0bc.

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Secondly, we incorporate knowledge of the physiology, or how we expect the anatomy to change due to treatment. We can represent these changes using the Jacobian of the deformation, which describes the local size and type of change. This is used to regularise the registration, and can be incorporated simultaneously with the iterations of the registration. The final result is an accurate and robust registration result that is clinically useful for finding corresponding features on pre- and post-treatment datasets.
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Thompson, Dale Leslie 1953. « THE USE OF GUIDED IMAGERY TO REDUCE ACUTE POSTOPERATIVE PAIN (EMOTIVE, RELAXATION) ». Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276726.

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Taylor, Mike. « The performance of vermicompost filtration : an on-site domestic waste treatment system / ». [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17846.pdf.

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Dinca, Elena. « Modelling the effects on milk of high-heat treatment and subsequent storage / ». St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18019.pdf.

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Harris, Ivor E. « The effects of biological waste treatment by acidogenic fermentation on certain pathogens / ». [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18146.pdf.

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Bowyer, Jocelyn Cathryn. « The ecological significance of dissolved organic nitrogen from wastewater treatment plant effluents / ». [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18524.pdf.

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Guo, Huayang. « The development of a gene transfer approach for the treatment of hypertension / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18895.pdf.

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Loch, David Charles. « Novel pharmacological approaches to the treatment of hypertensive heart disease and failure / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19110.pdf.

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Sudarjanto, Gatut. « Integrated chemical and biological treatment process to remove colour compounds from wastewater / ». [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19717.pdf.

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Hunter, Marc W. « CRT anti-glare treatments, image quality, and human performance ». Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52323.

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This dissertation was a two-phase effort. Phase I investigated the physical image quality of 16 mesh, etched, and quarterwave antireflection filters for varying levels of filter transmissivity. Three levels of ambient lighting and two levels of monochrome CRT resolution were combined factorially with the filters. In addition, user measures of readability, legibility, and perceived image quality were obtained for these same filter and environmental conditions. Quantitative models were developed to predict the performance and subjective data based on signal and noise measures derived from the physical measurements. Phase II examined the effects of a wide range of filter transmissions and diffuse illuminance on measured image quality and the same user measures as in Phase I. Phase I showed that while none of the glare filters yielded improved readability or legibility over a baseline condition, the etched and low transmission filters were notable for their degradation of human performance. Mesh and quarterwave filters were found to improve perceived image quality when a specular glare source was present. Modeling was minimally successful for the reading and legibility tasks, but yielded good fit models for perceived image quality. Phase II showed that when even extreme losses in display contrast occurred, users were capable of good reading and legibility performance. Perceived image quality was inversely related to illuminance level. Prediction of performance by image quality metrics was generally not too successful. It was concluded that in office-type environments, mesh or quarterwave filters can be used to improve perceived image quality when specular glare sources are present, but that no anti-glare filters yielded enhanced short-term readability or legibility over a baseline. Etched filters were not recommended. Measures of physical image quality proved to be good predictors of perceived image quality, but not of timed measures of readability or legibility. Under moderate lighting conditions, monochrome CRTs should be fitted with fairly high transmission filters as it was found the contrast enhancement offered by low transmission filters had negligible effects on performance. Finally, consistent and repeatable findings of degraded legibility for high luminance contrast levels (low illuminance) generated questions as to the existing standards regarding maximum contrast requirements for CRT use.
Ph. D.
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Ploeger, Lennert Simon. « Image-based verification of patient setup and treatment geometry in radiotherapy ». [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/86839.

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Hjalmarsson, Elina, et Anna Gustafsson. « Kvinnors kroppsbild vid bröstcancerbehandling : Women's body image at breast cancer treatment ». Thesis, Karlstads universitet, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-35897.

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Idag drabbas ca 9000 svenska kvinnor varje år utav bröstcancer, till detta medföljer olika typer av behandlingar i syfte att bota eller lindra. Både cancern och behandlingarna medför symtom och biverkningar som kan påverka kvinnans kropp. Syftet med litteraturstudien var att beskriva vilka faktorer som påverkade kroppsbilden kvinnor med bröstcancerbehandling. Metoden som användes i litteraturstudien var Polit & Becks (2012) niostegsmodell. Databaserna CINAHL och PubMed användes för att söka efter artiklar som svarade på litteraturstudiens syfte. Artiklarna granskades kritiskt och de som inkluderades kvalitetsgranskades och det kvarstod då 17 artiklar som utgjorde litteraturstudiens resultat. Data bearbetades till åtta grupper som i resultatdelen gav tre huvudkategorier. Resultatdelen består av: Fysiska faktorer som gav underkategorierna: Kirurgiska effekter samt biverkningar. Psykiska faktorer. Sociala faktorer som gav undergrupperna: Undvika socialt stöd, ta emot socialt stöd och den kvinnliga rollen. Slutsatsen: Förlusten av bröst, håravfall eller att få en förändrad kroppsvikt gör att många kvinnor känner att kroppen blivit missformad. En minskad attraktion och minskad kvinnlighet upplevdes och oro för vad andra skulle tycka om den förändrade kroppen uppstod. Känslan av rädsla skapades i samband med att kroppen förändrades.
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Marlowe, Eric-Jon Keawe. « Treatment of religious expression and belief in Utah public schools : perspectives of the religious minority / ». Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd776.pdf.

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Nolan, Curtis Daniel. « Effect of Initial Scarification and Overlay Treatment Timing on Chloride Concentrations in Concrete Bridge Decks ». Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2662.pdf.

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Nutter, Jasmine Aileen. « Contribution of Family Leisure to Family Functioning Among Families with Adolescents in Mental Health Treatment ». Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2683.pdf.

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Brannock, Matthew William Darcey. « Computational fluid dynamics tools for the design of mixed anoxic wastewater treatment vessels / ». [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17353.pdf.

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Paungmali, Aatit. « An investigation of a neuro-biological mechanism of a mobilisation-with-movement treatment / ». St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18040.pdf.

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Kollaras, Arthur E. « The autoclaving of municipal greenwastes as pre-treatment for use in soil enhancement / ». [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19320.pdf.

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Almajane, Antonio Francisco. « Outcome of tuberculosis treatment in Queensland (Australia) and Mozambique from 1995 to 2000 / ». [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16736.pdf.

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