Дисертації з теми "Medical and biomedical engineering"
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Stanier, Jeffrey. "Segmentation and editing of 3-dimensional medical images." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/10031.
Повний текст джерелаZhang, Hongbin. "Signal detection in medical imaging." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/290512.
Повний текст джерелаDo, Khoa Tat. "Universal Engineering Programmer - An In-house Development Tool For Developing and Testing Implantable Medical Devices In St. Jude Medical." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/488.
Повний текст джерелаKasrai, Reza. "On the perception of transparency : psychophysics and applications to medical image visualisation." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38493.
Повний текст джерелаLorimer, C. J. "Stimuli responsive polymers as medical implants." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269126.
Повний текст джерелаXiao, Xiao. "Development and control of a multi-dimensional micromanipulation system for bio-medical engineering." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691055.
Повний текст джерелаTang, Selina Vi Yu. "Synthesis of nanomaterials for biomedical applications." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14101/.
Повний текст джерелаKoo, Jahyun. "Accelerating a medical 3D brain MRI analysis algorithm using a high-performance reconfigurable computer." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18480.
Повний текст джерелаPlusieurs algorithmes ont été proposés pour l'analyse des données d'imagerie par résonance magnétique (IRM). Ceux-ci ont permis aux chercheurs cliniques d'analyser leurs données avec précision jusqu'à tout récemment. Mais avec l'augmentation des données quantitatives à analyser dans le domaine de l'imagerie du cerveau, il y a un besoin maintenant pour des méthodes pour accélérer ces algorithmes surtout que leur temps de calcul peut prendre plusieurs heures. Cette thèse présente le résultat d'une étude sur l'implémentation de ces algorithmes sur des ordinateurs reconfigurables à haute performance. L'estimation de volume partiel (PVE), un algorithme de classification du tissu de cerveau a été implémenté sur deux systémes SGI RASC RC100 qui utilisent le langage de haut niveau Mitrion-C. L'algorithme PVE sur processeur a été profilé pour identifier les fonctions intensives en temps de calcul et deux fonctions à virgule flottante estimant les densités de probabilité de tissus et l'information antérieure ont été implémenté sur des accélérateurs FPGA. Plusieurs images de cerveau humain simulées et réelles ont été utilisées pour vérifier la précision et l'amélioration en performance de l'algorithme PVE sur FPGA. Les coefficients de sensitivité et kappa ont été mesurés dans le but de vérifier la précision des images de l'implémentation sur FPGA. L'estimation des densités de probabilité sur FPGA et la fonction d'estimation d'information antérieure ont eu pour résultat des gains de performance de 2.5 et 9.4, respectivement. La performance globale de l'amélioration de l'algorithme PVE sur FPGA comparativement à l'algorithme établie sur processeur a été de 5.1 sur quatre processeurs.
Carey, Jason. "Axial, flexural and torsional rigidities of two-dimensional braided fibre composite medical catheters." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/28979.
Повний текст джерелаLang, Alexandra R. "Medical device design for adolescents." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12501/.
Повний текст джерелаBlack, Fiona E. "The characterisation and interactions of biomedical polymers." Thesis, University of Nottingham, 1999. http://eprints.nottingham.ac.uk/29655/.
Повний текст джерелаSchnabel, Julia Anne. "Multi-scale active shape description in medical imaging." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286180.
Повний текст джерелаUnsworth, Jennifer. "Novel porous scaffolds for tissue engineering cartilage." Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/10187/.
Повний текст джерелаMansouri, Sania. "Immunocamouflage of red blood cells by means of layer- by-layer self-assembly technique for medical transfusion." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97073.
Повний текст джерелаLes pénuries dans l'approvisionnement de sang ont des conséquences potentiellement mortelles pour les patients nécessitant une transfusion de sang rapide et urgente. Différentes tentatives de production de sang universel décrites dans la littérature présentent des inconvénients et induisent toujours l'activation du système immunitaire. Dans cette étude, nous rapportons une nouvelle stratégie de production de sang universel via la technique de déposition de couche par couche (CpC) de polymères tel que le chitosane-greffé-phosphorylcholine (CH-PC), la poly-L-lysine-greffé-polyéthylène glycol (PLL-PEG), l'acide hyaluronique (HA) et l'alginate (AL) sur les globules rouges (GR) fonctionnels et non-fixés. Cette idée est basée sur des résultats antérieurs, où les globules rouges ont été utilisés comme matrice pour l'auto-assemblage de multicouches pour la production de capsules creuses. L'objectif de cette thèse, était donc d'enrober des GR fonctionnels et non-fixés avec une multicouche polymérique.Les polyélectrolytes naturels, CH-PC, HA, PLL-PEG et AL ont été assemblés dans un système de multicouches sur les globules rouges non fixés dans un modèle deux-dimensions (2-D) via la technique d'assemblage électrostatique CpC. Une étude systématique des constructions formées par deux paires de polyélectrolytes biocompatibles de charges opposées a été effectuée. Par la modulation de la composition du film et les conditions de construction des CpC, telles que l'incorporation de PLL-PEG qui a la propriété de répulsion des protéines et en ajustant l'épaisseur du film et par conséquent la perméabilité de la multicouche, la reconnaissance par l'anticorps anti-A est empêchée.L'objectif principal de cette thèse était de développer une multicouche polymérique sur des GR non fixés et fonctionnels en suspension. Le design en suspension incluant CH-PC, PLL-PEG et AL qui ont été assemblés avec succès dans une multicouche nano-organisée sur des GR non fixés par la technique d'auto-assemblage électrostatique de CpC. La forme et la morphologie des GR n'ont pas été affectées par les multicouches de polymères. Les multicouches polymériques ont réussi à empêcher les anticorps anti-A, anti-B, anti-lewis y et anti-CD44 d'interagir avec leurs antigènes spécifiques à la surface des GR. De plus, les GR enrobés ont maintenu leur rôle initial de transporter l'oxygène. Cette recherche a démontré que l'assemblage de polyélectrolytes par la technique de CpC peut être utilisé comme un moyen d'induire l'immunocamouflage des antigènes érythrocytaires. Comme une étape préliminaire vers l'application clinique de ces GR universels, une étude in vivo a été réalisée pour évaluer la biocompatibilité et l'intégrité des GR de souris enrobés. Les GR enrobés ont survécu dans le sang et n'ont pas déclenché pas le système immunitaire chez la souris. Ces résultats représentent une étape importante vers l'application de ces GR universels en transfusion sanguine.
Li, Kejia. "Custom biomedical sensors for application in wireless body area networks and medical device integration frameworks." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/14632.
Повний текст джерелаDepartment of Electrical & Computer Engineering
Steve Warren
The U.S. health care system is one of the most advanced and costly systems in the world. The health services supply/demand gap is being enlarged by the aging population coupled with shortages in the traditional health care workforce and new information technology workers. This will not change if the current medical system adheres to the traditional hospital-centered model. One promising solution is to incorporate patient-centered, point-of-care test systems that promote proactive and preventive care by utilizing technology advancements in sensors, devices, communication standards, engineering systems, and information infrastructures. Biomedical devices optimized for home and mobile health care environments will drive this transition. This dissertation documents research and development focused on biomedical device design for this purpose (including a wearable wireless pulse oximeter, motion sensor, and two-thumb electrocardiograph) and, more importantly, their interactions with other medical components, their supporting information infrastructures, and processing tools that illustrate the effectiveness of their data. The GumPack concept and prototype introduced in Chapter 2 addresses these aspects, as it is a sensor-laden device, a host for a local body area network (BAN), a portal to external integration frameworks, and a data processing platform. GumPack sensor-component design (Chapters 3 and 4) is oriented toward surface applications (e.g., touch and measure), an everyday-carry form factor, and reconfigurability. Onboard tagging technology (Chapters 5 and 6) enhances sensor functionality by providing, e.g., a signal quality index and confidence coefficient for itself and/or next-tier medical components (e.g., a hub). Sensor interaction and integration work includes applications based on the GumPack design (Chapters 7 through 9) and the Medical Device Coordination Framework (Chapters 10 through 12). A high-resolution, wireless BAN is presented in Chapter 8, followed by a new physiological use case for pulse wave velocity estimation in Chapter 9. The collaborative MDCF work is transitioned to a web-based Hospital Information Integration System (Chapter 11) by employing database, AJAX, and Java Servlet technology. Given the preceding sensor designs and the availability of information infrastructures like the MDCF, medical platform-oriented devices (Chapter 12) could be an innovative and efficient way to design medical devices for hospital and home health care applications.
Bladen, John Stuart. "Imaging medical endoscopes in three dimensions using magnetic fields." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364248.
Повний текст джерелаPye, Stephen Dominic. "Medical ultrasonics : adaptive time gain compensation in diagnostic imaging." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/29955.
Повний текст джерелаCheikh, Al Ghanami Racha. "Novel thermoresponsive particle gels for tissue engineering applications." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12318/.
Повний текст джерелаSidney, Laura E. "Tissue engineering in hostile environments : the effects and control of inflammation in bone tissue engineering." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13499/.
Повний текст джерелаSingh, B. "Medical applications of mercuric iodide as a gamma ray detector." Thesis, Cardiff University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356730.
Повний текст джерелаSawkins, Michael John. "Development of three-dimensional patterning strategies for osteochondral tissue engineering." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/12987/.
Повний текст джерелаShi, Bibo. "Regularity-Guaranteed Transformation Estimation in Medical Image Registration." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1312842132.
Повний текст джерелаThomson, Ross John. "The psychosocial impact of home use medical devices." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39768/.
Повний текст джерелаMajani, Ruby. "Gut construction : scaffolds for intestinal tissue engineering." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/29319/.
Повний текст джерелаGinty, Patric J. "The supercritical processing of mammalian cells for applications in tissue engineering." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/11919/.
Повний текст джерелаQuang, Tri T. "Development of Compact Multimodal Optical Imaging and Medical Assessment Systems." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1452533192.
Повний текст джерелаAhmed, Shehnaz. "Self-reporting scaffolds for in situ monitoring for regenerative medicine and tissue engineering applications." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49511/.
Повний текст джерелаIslam, Md Asiful. "Efficient Microwave Imaging Algorithms with On-Body Sensors for Real-Time Biomedical Detection and Monitoring." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502906869993589.
Повний текст джерелаSalem, Aliasger K. "An injectable degradable porous polymer scaffold for tissue engineering and drug delivery." Thesis, University of Nottingham, 2002. http://eprints.nottingham.ac.uk/11918/.
Повний текст джерелаDelorme, Sebastien. "Biomechanical analysis of ankle kinematics and ligament strain in snowboarding." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29096.
Повний текст джерелаZhang, Jing 1961. "System identification of bladder hydrodynamics." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26440.
Повний текст джерелаThe bladders of six minipigs, three normal and three obstructed, were subjected to stochastic volume perturbations about different average volume levels and evoked pressure changes were measured. The hydrodynamic stiffness transfer function relating volume and pressure was calculated and described by a second-order, lumped parametric model having inertial, viscous and elastic terms. Estimates of the elastic constant (K) increased linearly with volume in both normal and obstructed animals. The rate of increase was substantially greater in the obstructed animals than in the normals. Consequently, this approach shows promise for distinguishing normal and obstructed bladder mechanics.
Veerassamy, Shalini. "Revisiting hemodynamic analysis of pulmonary edema after the onset of left ventricular dysfunction using a mathematical model of the cardiovascular system." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31075.
Повний текст джерелаGaliana, Laura. "Identification of ankle stiffness components in stroke patients." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79230.
Повний текст джерелаWe studied twelve (12) stroke patients with clinical evidence of ankle spasticity and compared them with nine (9) gender- and age-matched controls. Subjects lay supine with their foot attached to an electro-hydraulic actuator by a custom-fitted boot. Series of pseudo-random binary sequences were used to rotate the ankle. The position, torque, and EMG recorded during these perturbations were used to separate the reflex and intrinsic contributions of ankle stiffness.
The results of this study showed that ankle stiffness was increased in four (4) stroke patients, mostly due to the increased reflex stiffness component. Furthermore, the changes in reflex stiffness varied with position; ankle stiffness increased in these stroke subjects as the ankle was dorsiflexed. The reflex gain parameter explained the increased reflex stiffness.
Hauerstock, David. "Telemetric measurement of compressive loads in the sheep lumbar spine." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30785.
Повний текст джерелаA miniature load cell and radio transmitter were implanted in the L3--L4 space of the spine. A total of four sheep were operated on; one was sacrificed five days after surgery, due to failure of the transmitter, and another was sacrificed after failing to ambulate for two weeks after surgery. The other two animals (average mass 67 kg) were kept for five weeks, during which a range of activities were performed, including standing, lying prone, walking/trotting, and jumping.
Results for a range of activities were as follows: in walking at 1.5 m/s, average maximum and minimum loads were 461 N and 256 N, respectively; in walking at 2m/s, average maximum and minimum loads were 684 N and 303 N, respectively; in standing, loads averaged 161 N; and in lying prone, loads averaged 212 N. The highest loads were recorded in jumping, where the peak load was 1290 N.
The results of this study demonstrate for the first time, to our knowledge, the magnitude of in vivo axial loads in the sheep lumbar spine. These findings have implications for the evaluation of studies which employ the sheep model to test spinal implants. As treatment methods for disc degeneration progress from the spacer and fusion approach to more sophisticated prostheses and tissue engineered disc replacements which preserve segmental mobility, such data will become even more important to the design, animal testing, and evaluation of implants.
Shen, Litao. "Diffusion tensor imaging application." Thesis, Purdue University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1602902.
Повний текст джерелаCentral nervous system (CNS) related conditions and diseases like mild traumatic brain injury (mTBI) and multiple sclerosis (MS) affect people’s life quality, yet there is no single test for the diagnosis of these diseases or conditions. Patients may need to wait for years until they are diagnosed correctly to get the correct treatment, which is often too late. Thus, there is a strong need to develop some techniques to aid the diagnosis of CNS-related conditions and diseases. The conventional MRI can reveal the structure of the brain but cannot detect the difference between the healthy tissue and the anomalies. Diffusion tensor imaging (DTI) has been used for detecting white matter integrity and demyelination for the past decade in experiments and has been proven to have the ability to depict the problem effectively. In the past decade, many techniques were found based on DTI data, and these techniques improved pre-processing, processing, and post-processing.
Though there are many software and APIs that can provide functions for DTI file input/output (IO), visualization and other DTI related topics, there is no general software or API that is dedicated to covering the whole processing procedure of DTI that at the same time can be extended easily by the user. This thesis is dedicated to developing a software that can be used to aid in the diagnosis of CNS-related conditions and diseases while at the same time trying to cover as many topics as possible. Another purpose is to make the software highly extensible.
This thesis work first introduces the background of CNS-related disease and uses MS as an example to introduce the process of demyelination and the white matter integrity problem, which are involved in these CNS-related diseases and conditions. Then the diffusion process and the technique that can detect the diffusion signal (DTI) is presented. After this, concepts and meaning of the secondary metrics are discussed. Then, current existing software and APIs and their advantages and disadvantages are outlined. After these points, the techniques that are discussed in this thesis as well as their advantages are outlined. This part is followed by the charts and code samples which can illustrate the process and structure of this software. Then different modules and their results are explained.
In this software, the results are represented by images and 3D models. There are color images, pseudo color images with different schemes and gray scale images. Images are mainly included to represent the FA and MD data. In this software, streamlines are generated from the eigenvalue and eigenvector. Then a bundled result for the streamline is also realized in this software. The streamline and bundled results are 3D models. For 3D models, there are mainly two ways to display the real 3D model. One is the naked eye 3D which doesn’t require the user to wear glasses but has less stereoscopic characteristics. As the stereoscopic monitors and glasses are more and more popular and easily accessible, this software also provides stereoscopic views for 3D models, and the user can choose red & blue, interlaced techniques with proper glasses.
This thesis work ends with the discussion of the results and limitations of DTI. Finally, there is a discussion about the future work that can improve the performance of this software and topics that need to be covered.
Lakhotia, Kritika. "Visualization and quantification of 3D tumor-host interface architecture reconstructed from digital histopathology slides." Thesis, State University of New York at Buffalo, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10127616.
Повний текст джерелаOral cavity cancer (OCC) is a type of cancer of the lip, tongue, salivary glands and other sites in the mouth (buccal or oral cavity) and is the sixth leading cause of cancer worldwide. Patients with OCC are treated based on a staging system: low-stage patients typically receive less aggressive therapy compared to high-stage patients. Unfortunately, low-stage patients are sometimes at risk for locoregional recurrence. Recently, a semi-quantitative risk scoring system has been developed to assess the locoregional recurrence risk for low-stage patients. This risk scoring system is based on tissue characteristics determined on 2D histopathology images under a microscope. This modality limits the appreciation of the 3D architecture of the tumor and its associated morphological features. This thesis aims to visualize 3D models of the tumor-host interface reconstructed from serially-sectioned histopathology slides and quantify their clinically validated morphological features to predict locoregional recurrence after treatment. The 3D models are developed and quantified for 6 patient cases using readily available tools. This pilot study provides a framework for an automated diagnostic technique for 3D visualization and morphological analysis of tumor biology which is traditionally done using 2D analysis.
Thompson, Carla M. "The Utility of Patient-Specific CT Dose Estimation Maps." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1440534502.
Повний текст джерелаHuang, Jiwei. "Multispectral Imaging of Skin Oxygenation." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356637098.
Повний текст джерелаPerring, Steve. "Clinical applications of the three dimensional (3D) analysis and visualisation of medical slice images." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387074.
Повний текст джерелаHe, Jianyi. "THE COMMERCIAL IMPACT ON BUSINESS MODELS OF MEDICAL IMAGING SOLUTIONS THROUGH DATA-ANALYTICAL METHODOLOGIES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1620233525109266.
Повний текст джерелаWadkins, David Allen. "Nanoparticles: nanoscale systems for medical applications." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/6008.
Повний текст джерелаPaik, Isha. "Development of an in vitro pump : mechanical characterization and surface engineering of elastomeric membranes." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28237/.
Повний текст джерелаHidalgo-Bastida, Lilia Araida. "Development of a novel porous scaffold : assessment of its suitability for cardiac muscle engineering." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/29087/.
Повний текст джерелаKim, Wan. "Study of parallel MR imaging techniques." Thesis, State University of New York at Buffalo, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1594739.
Повний текст джерелаIn MRI, it is more desirable to scan less data as possible because it reduces MRI scanning time. We want to get a clear image by reconstructing the signals we acquire from the MRI machine. Special scanning or sampling techniques are needed to overcome this issue based on various mathematical methods.
We present an improved random sampling pattern for SAKE (simultaneous autocalibrating and k-space estimation) reconstruction and an iterative GRAPPA reconstruction using Wiener filter.
In our iterative method using Wiener filter, in contrast to the conventional GRAPPA where only the auto calibration signals (ACS) are used to find the convolution weights, our proposed method iteratively updates the convolution weights using both the acquired and reconstructed data from previous iterations in the entire k-space. To avoid error propagation, the method applies adaptive Wiener filter on the reconstructed data. Experimental results demonstrate that even with a smaller number of ACS lines the proposed method improves the SNR when compared to GRAPPA.
In compressed sensing MRI, it is very important to design sampling pattern for random sampling. For example, SAKE (simultaneous auto-calibrating and k-space estimation) is a parallel MRI reconstruction method using random undersampling. It formulates image reconstruction as a structured low-rank matrix completion problem. Variable density (VD) Poisson discs are typically adopted for 2D random sampling. The basic concept of Poisson disc generation is to guarantee samples are neither too close to nor too far away from each other. However, it is difficult to meet such a condition especially in the high density region. Therefore the sampling becomes inefficient. In this paper, we present an improved random sampling pattern for SAKE reconstruction. The pattern is generated based on a conflict cost with a probability model. The conflict cost measures how many dense samples already assigned are around a target location, while the probability model adopts the generalized Gaussian distribution which includes uniform and Gaussian-like distributions as special cases. Our method preferentially assigns a sample to a k-space location with the least conflict cost on the circle of the highest probability. To evaluate the effectiveness of the proposed random pattern, we compare the performance of SAKEs using both VD Poisson discs and the proposed pattern. Experimental results for brain data show that the proposed pattern yields lower normalized mean square error (NMSE) than VD Poisson discs.
Haemer, Gillian. "Optimizing Radio Frequency Coil Performance for Parallel Magnetic Resonance Imaging at Ultra High Field| Evaluation and Optimization of Integrated High Permittivity Materials." Thesis, New York University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10751718.
Повний текст джерелаIn the time since magnetic resonance imaging (MRI) was introduced, scientific progress has allowed for a factor-of-ten increase in static magnetic (B 0) field strength, and has developed MR into a clinical workhorse. This increase in B0 field strength has the potential to provide significant gains to the inherent signal-to-noise ratio of resulting images. However, this progress has been limited by degradations in the spatial homogeneity of the radiofrequency magnetic fields used for nuclear excitation (B 1), which have wavelengths comparable to the dimensions of the human body in modern high-field MRI. Techniques to improve homogeneity, including B1-shimming and parallel transmission, require multi-element radiofrequency (RF) transmit arrays. Increasing B0 field strength is also associated with an increase in the deposition of RF energy into the subject, clinically measured and regulated as Specific energy Absorption Rate (SAR), deposited in tissue during image acquisition. High permittivity materials (HPMs) have the potential to augment RF coil performance outside of B1-shimming or parallel transmission methods. The use of HPM pads placed in existing RF coils has also been shown to provide a potential reduction of array SAR in nuclear excitation, as well as potential performance benefits in signal reception. However, the question of how best to strategically use these materials in the space between the coil and the sample in order to maximize benefit and alleviate any potential problems has not yet been thoroughly addressed.
The contributions presented in this dissertation demonstrate the potential utility of the integration of HPMs into transmit-receive RF coils, as an integral component of the hardware design. A framework to quickly choose the relative permittivities of integrated materials, optimized relative to an absolute standard (rather than relative to a different design) is introduced, and used to demonstrate that readily available material properties can provide significant improvements in multi-element transmit performance. A subsequent analysis of practical effects and limitations of these materials on the RF coil resonance properties is performed, including the description of a unique adverse resonance splitting phenomenon and how to avoid it. A transmit/receive RF coil design is built and evaluated, first on its own experimentally, and then in simulation with a helmet-shaped high permittivity material former to examine the benefits and challenges associated with HPM integration into RF coils.
Gordon, Kerry. "Modelling and monitoring of medical time series." Thesis, University of Nottingham, 1986. http://eprints.nottingham.ac.uk/12369/.
Повний текст джерелаYoung, Melissa Denton. "Arterial Calcification and the Clinical Implications on Stent Function." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1364999090.
Повний текст джерелаLewandowski, Mark E. "The Design, Fabrication, and Evaluation of Mobile Point-of-Care Systems for Cellular Imaging in Microfluidic Channels." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1512576064493513.
Повний текст джерелаLee, Zhi Hou. "Improved multiple input multiple output blind equalization algorithms for medical implant communication." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28726/.
Повний текст джерелаWarrick, Philip A. "A VRML-based anatomical visualization tool for medical education." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29635.pdf.
Повний текст джерела