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Dissertations / Theses on the topic 'Array coil de superfície'

Author: Grafiati

Published: 10 September 2021

Last updated: 29 July 2025

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1

Wei, Juan. "Coil array optimization and wireless transceiver design for MRI." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38583021.

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Wei, Juan, and 魏娟. "Coil array optimization and wireless transceiver design for MRI." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38583021.

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Wu, Bing. "Microstrip radio-frequency coil and array design for magnetic resonance imaging." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3704672X.

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Wu, Bing, and 吳冰. "Microstrip radio-frequency coil and array design for magnetic resonance imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B3704672X.

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5

Dominick, Colleen Elizabeth. "An investigation of array elements for enhanced single echo acquisition imaging." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4309.

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Rapid MR imaging has facilitated the development of a variety of medical tools such as MR guided surgeries, drug delivery, stent placement, biopsies, and blood flow imaging. This rapid imaging is largely attributable to the development of parallel imaging techniques. In one such technique, single echo acquisition (SEA) imaging, scan time is reduced by substituting the lengthy phase encoding process with spatial information from an extensive receiver coil array. In order to easily construct and obtain images from this coil array, an ideal set of coil elements would be easily decoupled and tuned

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Kriegl, Roberta. "A flexible coil array for high resolution magnetic resonance imaging at 7 Tesla." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112425/document.

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L’imagerie par résonance magnétique (IRM) est un outil d’investigation majeur donnant accès de manière non invasive à des nombreuses informations quantitatives et fonctionnelles. La qualité des images obtenues (rapport-signal-sur-bruit, RSB) est cependant limitée dans certaines applications nécessitant des résolutions spatiales et/ou temporelles poussées. Afin d’améliorer la sensibilité de détection des équipements d’IRM, diverses orientations peuvent être suivies telles qu’augmenter l’intensité du champ magnétique des imageurs, améliorer les performances des systèmes de détection radiofréquen

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Ravi, Anandh. "Efficacy of a Multi-Channel Array Coil for Pediatric Cardiac Magnetic Resonance Imaging." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226615129.

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8

Consalter, Daniel Martelozo. "Implementação de aquisição paralelas de imagens utilizando bobinas de RF tipo phased array e sampled array." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14092017-154855/.

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Técnicas de aquisição paralelas e hardware dedicados vem sendo desenvolvidos desde a década de 1980 para reduzir o tempo de aquisição de imagens via ressonância magnética (IRM). Uma bobina do tipo phased array é um dispositivo do tipo receptor, que usa múltiplas bobinas (canais) cada qual com seu próprio circuito de detecção para adquirir simultaneamente os sinais que formam uma imagem ou espectro via IRM. Exemplos de técnica de imagem paralela que usa bobinas tipo phased array são Sensitivy Enconding (SENSE) e GeneRalized Autocalibrating Partial Parallel Acquisition (GRAPPA). Sampled array é

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9

Serano, Peter James. "Design of a Multi-Array Radio-Frequency Coil for Interventional MRI of the Female Breast." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/747.

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A new method for the simulation of radio frequency (RF) coils has been developed. This method utilizes the FEM simulation package Ansoft HFSS as a base for the modeling of RF coils with complex biological loading effects. The abilities of this software have been augmented with custom MATLAB code to enable the fast prediction of lumped element values needed to properly tune and match the coil structure as well as to perform the necessary post processing of simulation data in order to quickly generate and evaluate field data of the resonating coil and compare design variations. This method was e

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Spatz, Mark H. "A 64 channel 3T array coil for highly accelerated fetal imaging at 22 weeks of pregnancy." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113108.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (page 65).<br>MRI is an attractive tool for fetal imaging due to its unique ability to provide detailed anatomical and physiological data in an inherently safe manner. In practice, the problem of unpredictable and nonrigid fetal mo

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Gotshal, Shmuel. "High frequency transmit-receive phased array coil for head and neck MR neuroimaging at 3 Tesla." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000688.

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Kızıldağ, Eren C. "Improved magnetic resonance chemical shift imaging at 3 Tesla using a 32-channel integrated RF-shim coil array." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108976.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 87-93).<br>In vivo chemical shift imaging is an imaging modality which uses the so-called chemical-shift phenomenon to quantitate brain metabolites spatially, therefore renders the study of brain metabolism and neurodegenerative diseases possible and eases diagnosis of tumors. However, the method is highly vulnerable to local main magnetic field (Bo) inhomogeneities arising from magnetic susc

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13

Xie, Yuedong. "Modelling techniques and novel configurations for meander-line-coil electromagnetic acoustic transducers (EMATs)." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-techniques-and-novel-configurations-for-meanderlinecoil-electromagnetic-acoustic-transducers-emats(78777548-e2c6-468f-9a4b-12daaa29b53c).html.

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Electromagnetic acoustic transducers (EMATs) are increasingly used in industries due to their attractive features of being non-contact, cost-effective and the fact that a variety of wave modes can be generated, etc. There are two major EMATs coupling mechanisms: the Lorentz force mechanism for conductive materials and the magnetostriction mechanism for ferromagnetic materials; EMATs operated on Lorentz force mechanism are the focus of this study. This work aims to investigate novel efficient modelling techniques for EMATs, in order to gain further knowledge and understanding of EMATs wave patt

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Tan, Yee Mei. "Electromagnetic inspection techniques for glass production." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/electromagnetic-inspection-techniques-for-glass-production(7e0fc64d-0995-4db2-a563-abd4f198b156).html.

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This thesis considers the feasibility of using the electromagnetic techniques to monitor the wear of the refractory base of a glass-making furnace. The research focuses in building a system that is able to provide measurements of the distance to the molten glass in this demanding high temperature application. The main challenge in this project is to eliminate the effect of the refractory supporting steel structure and still be able to detect and exploit a much smaller signal from the molten glass. In order to differentiate between the molten glass and the steel supports, a multi-coil, multi-fr

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Souza, Gustavo Souto de Sá e. "Arranjo linear de dez eletrodos ativos sem fio para eletromiografia de superfície." Universidade Federal de Goiás, 2013. http://repositorio.bc.ufg.br/tede/handle/tede/3895.

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Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-01-16T17:10:19Z No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Dissertação - Gustavo Souto de Sá e Souza - 2013.pdf: 6684567 bytes, checksum: fefcf131a81d9d993c2ef7f8bf77fa9e (MD5)<br>Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-01-16T17:36:13Z (GMT) No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Dissertação - Gustavo Souto de Sá e Souza - 2013.pdf: 6684567 bytes, checksum: fefcf131a81d9d993c2ef7f8

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Li, Zhoujian. "Développement de réseaux d’antennes supraconductrices pour l’imagerie par résonance magnétique haute résolution à champ intermédiaire à champ intermédiaire." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS046/document.

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En microscopie IRM, la sensibilité de détection est critique pour obtenir des images avec un rapport signal sur bruit suffisant car l’intensité du signal RMN devient extrêmement faible. Une stratégie alternative à l’utilisation de champs statiques élevés consiste à améliorer les performances des antennes radiofréquences qui détectent le signal d’IRM. Plus particulièrement, la stratégie dans laquelle s’inscrit ce travail de thèse vise à exploiter la haute sensibilité des antennes miniatures supraconductrices basées sur le principe des résonateurs monolithiques à ligne de transmission avec comme

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17

Shen, Boyang. "Study of second generation high temperature superconductors : electromagnetic characteristics and AC loss analysis." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276688.

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This thesis presents a novel study on Second Generation High Temperature Superconductors, which covers their electromagnetic characteristics and AC loss analysis. Lorentz Force Electrical Impedance Tomography (LFEIT) is one of the most promising hybrid diagnostic scanners with burgeoning potential for biological imaging, particularly in the detection of cancer and internal haemorrhages. The author tried a novel combination of superconducting magnets together with the LFEIT system. The reason is that superconducting magnets can generate a magnetic field with high intensity and homogeneity, whic

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Papoutsis, Konstantinos. "Construction and characterisation of MRI coils for vessel wall imaging at 7 tesla." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:bd44e9b5-7600-4861-ba38-f324d4395165.

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Atherosclerotic plaques in the bifurcation of the carotid artery vessels can pose a significant stroke risk from stenosis, thrombosis and emboli, or plaque rupture. However, the possibility of the latter depends on the structure of the plaque and its stability. So far, the assessment of such depositions, and the evaluation of the risk they pose, is not satisfactory with 3 Tesla black blood imaging. It is expected that the SNR increase at 7 Tesla, together with an appropriate and patient-safe RF coil, will result in higher resolution images that would help in better assessing the composition of

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19

Santos, Ana Carolina de Araújo Evangelista dos. "Influência de parâmetros geométricos no desempenho termo-hidráulico do lado do ar em serpentinas." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-19122005-184847/.

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O objetivo da presente pesquisa é analisar o desempenho termo-hidráulico do lado do ar de trocadores de calor tubo-aletados. Uma pesquisa da literatura foi executada em duas áreas diferentes: desempenho termo-hidráulico e seleção de superfície, feita por comparações de desempenho, para otimizar o projeto de trocadores de calor. O impulso principal da pesquisa esteve na avaliação experimental de dez serpentinas para investigar o efeito dos seguintes parâmetros sobre o desempenho do lado do ar: número de fileiras de tubos, densidade de aletas, superfície interna dos tubos e superfície da aleta (

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20

Souza, Victor Hugo de Oliveira e. "Avaliação dos efeitos da orientação da bobina de estimulação magnética transcraniana nos potenciais evocados motores do músculo abdutor curto do polegar por eletromiografia de alta densidade." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-16042014-142559/.

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A estimulação magnética transcraniana (EMT) aplicada com diferentes orientações da bobina causa variações na amplitude e na latência dos potenciais evocados motores (PEM) dos músculos da mão. No entanto, as propriedades dos PEM são afetadas também pelos sistemas de detecção, e.g. localização e tamanho dos eletrodos de aquisição, e pela anatomia do músculo analisado, e.g. arquitetura dos tecidos muscular e adiposo. Neste estudo, verificamos como variam a distribuição espacial, a amplitude pico a pico, a latência, a velocidade de condução da fibra muscular e a frequência mediana do espectro de p

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21

Khan, Muneeb Ullah. "Contribution to the design and fabrication of an integrated micro-positioning system." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP1671/document.

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L’objectif de la thèse est de développer un dispositif de micro positionnement intégrant à la fois les actionneurs et les capteurs. Un dispositif a été conçu afin de réaliser des déplacements dans les plans sur une course millimétrique. Le dispositif compact ne nécessite pas de système de guidage additionnel et selon le mode d’utilisation de ces moteurs, il est capable de réaliser des translations dans le plan ou des rotations autour d’un axe perpendiculaire au plan. Le dispositif comprend quatre moteurs électromagnétiques linéaires fixés orthogonalement sur une structure en forme de croix. Ch

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22

Ji, Yiyi. "Dual tuned 19F/1H multichannel coil for magnetic resonance imaging of human knee at 7.0 Tesla." Master's thesis, 2013. http://hdl.handle.net/10451/9612.

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Tese de mestrado integrado em Engenharia Biomédica e Biofísica (Engenharia Clínica e Instrumentação Médica), apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2013<br>Anti-inflamatórios não esteróides (NSAIDs) tópicos foram introduzidos no tratamento da artrite reumatóide, de forma a evitar os efeitos secundários da administração oral destes medicamentos. Embora seja conhecido que os NSAIDs de aplicação tópica são capazes de penetrar na pele humana, não existem estudos com humanos in vivo que mostrem a eficiência de penetração e o percurso do medicamento até ao local de i

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23

Hsu, Ching-Yang, and 徐京暘. "Study of a Smart Contactless Charging Platform with Coil Array." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/wz35xv.

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碩士<br>國立臺北科技大學<br>電子工程系研究所<br>103<br>This thesis proposes a contactless charging platform that allows portable devices or other mobile devices being placed and charged. Using wound-wire structure and electromagnetic induction, contactless power transmission can be achieved between platform and electronic devices. The charging platform adopts a microcontroller to select the appropriate array coils to be actived. The proposed array structure not only retains the original sensing area but also detects the secondary-side coil position to drive the primary-side coil and charge the load. Comparing t

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Chang, Tsung-wen, and 張宗文. "Study of Contactless Charging Platform with Coil Array Structure for Mobile Phone." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/02611814684782017006.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>95<br>This thesis studies a charging method based on contactless power transmission techniques for lithium battery of cell-phone, and proposes a common charging platform. The charging platform is formed with several pot-cores, in order to the charging circuit put on the platform would work in permitting displacement. Because contactless inductive structure exist a large air gap, power transmission efficiency is poor. Phase-locked loop (PLL) is used to let operation frequency of circuit maintain on primary resonant frequency in charging platform. And input power lo

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25

Ramirez, Marc Stephen. "A 20-coil array system for high-throughput dynamic contrast-enhanced mouse MRI." 2011. http://hdl.handle.net/2152/20659.

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MRI is a versatile tool for systematically assessing anatomical and functional changes in small animal models of human disease. Its noninvasive nature makes MRI an ideal candidate for longitudinal evaluation of disease progression in mice; however achieving the desired level of statistical power can be expensive in terms of imaging time. This is particularly true for cancer studies, where dynamic contrast-enhanced (DCE-) MRI, which involves the repeated acquisition of anatomical images before, during, and after the injection of a paramagnetic contrast agent, is used to monitor changes in tum

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26

Lee, Jo, and 李柔. "Multichannel Radio-Frequency Receive Coil Array for Pediatric Brain at 3T Magnetic Resonance Imaging." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/47230892065794424037.

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碩士<br>國立臺灣大學<br>醫學工程學研究所<br>102<br>The aim of this thesis is to develop a multi-channel radio-frequency (RF) receive coil array applicable to pediatric brains on a 3T magnetic resonance imaging (MRI) system. The helmet of the array was designed to fit 7-year-old children’s head and neck in order to improve the signal-to-noise ratio. The array consisted of 32 circular surface coils. All coils had 8 cm diameter and were evenly distributed. By optimally overlapping adjacent coils and using low input-impedance preamplifiers, we reduced the coupling between coils efficiently. The average of S12 fro

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27

Lin, Po-Jung, and 林柏榮. "Magnetic Domain-Array Configured Coil-Less Nano-Electromagnet for Memory and NEMS/MEMS Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/27909516610493725590.

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碩士<br>國立交通大學<br>機械工程系所<br>102<br>In this thesis, a magnetic domain-array configured coil-less nano-electromagnetic actuating technique is reported. We use the semi-conductor processing technology to fabricate the nano-electromagnet consisting of a piezoelectric material (PZT thin film) and magnetostrictive material (Ni nanostructures exhibiting magnetic single-domain). To create diverse applications of the electromagnet and corresponding electromagnetic-actuating for data storage and NEMS/MEMS systems, the nano-electromagnet utilizes a design concept combing the energy provide by an electric f

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Sung, Po-Jung, and 宋柏融. "Magnetic Resonance Imaging of Rat’s Brain and Spine Using Curved Four-channel Phased Array Coil." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/61472278079858390347.

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碩士<br>國立臺灣大學<br>生醫電子與資訊學研究所<br>104<br>Magnetic resonance imaging (MRI) techniques such as anatomical and diffusion tensor imaging (DTI) have been widely applied to investigate the central nervous system (CNS). However, commercial MRI coils could not provide sufficient signal-to-noise ratio (SNR) at the neck due to cervical lordosis (inward curvature), therefore hampering the applications from brain to the spine. The aim of this work was to design and implement a 4-channel curved array coil that provides uniform sensitivity along the CNS, improving studies of the head and spinal column. The 4-c

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29

(7419416), Xianglun Mao. "PARALLEL TRANSMISSION (PTX) TECHNIQUES AND APPLICATIONS ON A TRANSCEIVER COIL ARRAY IN HIGH-FIELD MRI." Thesis, 2019.

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<div>Magnetic resonance imaging (MRI) has become an invaluable tool in health care. Despite its popularity, there is still an ever-increasing need for faster scans and better image quality. Multi-coil MRI, which uses multiple transmit and/or receive coils, holds the potential to address many of these MRI challenges. Multi-coil MRI systems can utilize parallel transmission (pTx) technology using multi-dimensional radio-frequency (RF) pulses for parallel excitation. The pTx platform is shown to be superior in high-field MRI. Therefore, this dissertation is focused on the RF pulse design and opti

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Nguyen, Vu Huy. "A Multi-axis Compact Positioner with a 6-coil Platen Moving Over a Superimposed Halbach Magnet Matrix." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9068.

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A multi-axis compact positioner is designed and implemented in this thesis. The single-moving-part positioner is designed to move in the magnetic field generated by a superimposed concentrated-field permanent magnet matrix. The compact positioner is primarily for the stepping and scanning applications that require 3-DOF planar motions. In which, the travel ranges in two orthogonal directions are on the order of 100 mm. The moving platen, which has the size of 185.4 mm x 157.9 mm and weighs 0.64 kg, mainly comprises of a plastic frame and six copper coils. It is actuated in the horizontal plane

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Lin, Fa-Hsuan, and 林發暄. "Optimization of head phased array coil design in magnetic resonance imaging using method of moment its principles and applications." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/09025167341333010350.

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碩士<br>國立臺灣大學<br>電機工程研究所<br>84<br>Brain research has utilized lots of the most advanced radiological medicine technologies, such as functional magnetic resonance imaging (fMRI), magnetic resonance angiography (MRA), in-vivo magnetic reso- nance spectroscopy(InVivo MRS) and radiosurgery. While these techno- logies are usually implemented with high SNR, high resolution magnetic resonance imaging (MRI) for optimal performance. Nowadays, clinica

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Κοντομίχος, Φώτιος. "Μέθοδοι και διατάξεις απευθείας ηλεκτροακουστικής μετατροπής για ψηφιακό ήχο". Thesis, 2011. http://nemertes.lis.upatras.gr/jspui/handle/10889/4711.

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Η παρούσα διδακτορική διατριβή εστιάστηκε στη μελέτη συστημάτων ακουστικής εκπομπής για απευθείας αναπαραγωγή ψηφιακού ήχου. Η ερευνητική διαδικασία βασίστηκε στον προσδιορισμό και βελτίωση των δυνατοτήτων δύο διαφορετικών υλοποιήσεων ακουστικής μετατροπής: i. Ένα υβριδικό πρωτότυπο θερμοακουστικό στοιχείο και ii. Μια συστοιχία 32 ηλεκτροδυναμικών μεγαφώνων σχεδιασμένη, ώστε να αναπαράγει ψηφιακά ηχητικά σήματα. Η θερμοακουστική μετατροπή προσφέρει μια εναλλακτική τεχνική για υλοποιήσεις ακουστικών στοιχείων. Είναι βασισμένη στο μετασχηματισμό των διακυμάνσεων της θερμικής ενέργειας σε ακουστ

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