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Статті в журналах з теми "Phased array coils"
Ying, Leslie, and Zhi-Pei Liang. "Parallel MRI Using Phased Array Coils." IEEE Signal Processing Magazine 27, no. 4 (July 2010): 90–98. http://dx.doi.org/10.1109/msp.2010.936731.
Повний текст джерелаGareis, Daniel, Tobias Wichmann, Titus Lanz, Gerd Melkus, Michael Horn, and Peter M. Jakob. "Mouse MRI using phased-array coils." NMR in Biomedicine 20, no. 3 (2007): 326–34. http://dx.doi.org/10.1002/nbm.1156.
Повний текст джерелаMonroe, James W., Petra Schmalbrock, and Dimitrios G. Spigos. "Phased Array Coils for Upper Extremity MRA." Magnetic Resonance in Medicine 33, no. 2 (February 1995): 224–29. http://dx.doi.org/10.1002/mrm.1910330212.
Повний текст джерелаDe Marchi, Daniele, Alessandra Flori, Nicola Martini, and Giulio Giovannetti. "Artifacts by Misalignment of Cardiac Magnetic Resonance Phased-array Coil Elements: From Simulation to In vivo Test." Current Medical Imaging Formerly Current Medical Imaging Reviews 15, no. 3 (February 25, 2019): 301–7. http://dx.doi.org/10.2174/1573405613666171024150250.
Повний текст джерелаHricak, H., S. White, D. Vigneron, J. Kurhanewicz, A. Kosco, D. Levin, J. Weiss, P. Narayan, and P. R. Carroll. "Carcinoma of the prostate gland: MR imaging with pelvic phased-array coils versus integrated endorectal--pelvic phased-array coils." Radiology 193, no. 3 (December 1994): 703–9. http://dx.doi.org/10.1148/radiology.193.3.7972810.
Повний текст джерелаHatabu, Hiroto, Warren B. Gefter, John Listerud, Eric A. Hoffman, Leon Axel, Joseph C. McGowan, Harold I. Palevsky, Cecil E. Hayes, Junji Konishi, and Herbert Y. Kressel. "Pulmonary MR Angiography Utilizing Phased-Array Surface Coils." Journal of Computer Assisted Tomography 16, no. 3 (May 1992): 410–17. http://dx.doi.org/10.1097/00004728-199205000-00012.
Повний текст джерелаDamen, Frederick C., and Kejia Cai. "B1− non-uniformity correction of phased-array coils without measuring coil sensitivity." Magnetic Resonance Imaging 51 (September 2018): 20–28. http://dx.doi.org/10.1016/j.mri.2018.04.009.
Повний текст джерелаSun, Qi, Min-jun Dong, Xiao-feng Tao, Meng-da Jiang, and Chi Yang. "Selection and application of coils in temporomandibular joint MRI." Dentomaxillofacial Radiology 49, no. 3 (March 2020): 20190002. http://dx.doi.org/10.1259/dmfr.20190002.
Повний текст джерелаFütterer, Jurgen J., Marc R. Engelbrecht, Gerrit J. Jager, Robert P. Hartman, Bernard F. King, Christina A. Hulsbergen-Van de Kaa, J. Alfred Witjes, and Jelle O. Barentsz. "Prostate cancer: comparison of local staging accuracy of pelvic phased-array coil alone versus integrated endorectal–pelvic phased-array coils." European Radiology 17, no. 4 (October 6, 2006): 1055–65. http://dx.doi.org/10.1007/s00330-006-0418-8.
Повний текст джерелаBeck, Michael J., Dennis L. Parker, and J. Rock Hadley. "Capacitive versus Overlap Decoupling of Adjacent Radio Frequency Phased Array Coil Elements: An Imaging Robustness Comparison When Sample Load Varies for 3 Tesla MRI." Concepts in Magnetic Resonance Part B, Magnetic Resonance Engineering 2020 (December 15, 2020): 1–14. http://dx.doi.org/10.1155/2020/8828047.
Повний текст джерелаДисертації з теми "Phased array coils"
Stark, Joseph C. (Joseph Charles) 1980. "Wireless power transmission utilizing a phased array of Tesla coils." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/18036.
Повний текст джерелаIncludes bibliographical references (p. 245-247).
This thesis discusses the theory and design of coupled resonant systems and how they can be linked in a phased array for the wireless transmission of electrical power. A detailed derivation of their operational theory is presented with a strong emphasis on the current and voltage waveforms produced. Formulas are presented relating the features of the waveforms to specific parameters of the system. They provide a theoretical basis for the design of the TeslaE coil systems. Unloaded and loaded operating efficiency is considered from both a power and energy perspective with emphasis on maximizing the two quantities. With these design formulas, a working set of two distinct coupled resonant systems were locked in frequency and controllable in phase to produce a phased array capable of wireless power transmission. The operational details and practical design considerations are presented and explained. The measured output waveforms were found to closely agree with the predicted models.
by Joseph C. Stark, III.
M.Eng.
Papoti, Daniel. "Desenvolvimento de bobinas de RF transmissoras e receptoras do tipo phased arrays para experimentos de imagens por ressonância magnética em ratos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-25052011-162055/.
Повний текст джерелаMagnetic Resonance Imaging (MRI) experiments on small animals, as well as in human, require a specific RF coil set in order to maximize the Radiofrequency (RF) field homogeneity during transmission and Signal-to-Noise Ratio (SNR) during reception. The most common geometries of RF transmitter coil used in human systems are the well known Birdcage resonators. Among the receiver coils geometry the concept of NMR Phased Arrays or multi channel coils is widely employed in applications that need a high SNR in a large region of interest (ROI), further allowing parallel imaging acquisition methodologies. The work reported here describes the development of a transmit-only and receive-only RF coil set actively detuned specifically designed to MRI acquisition of rats brain for purposes of neuroscience studies. The transmitter geometries developed were two Birdcages with 8 and 16 rungs and our proposed geometry named Double Crossed Saddle (DCS). For reception we developed one common surface coil made of two turn loops and a 2-channel Phased Array, both actively detuned during reception. The results have confirmed that the 16 rungs Birdcage are superior among other transmit coils in producing homogeneous RF field inside a ROI of 80% of coil´s inner diameter. However, the simplicity and reduced number of capacitors makes the DCS coil a good choice in experiments with different samples and load conditions. Among the receive coils developed, the surface coil showed a better SNR in comparison with the 2-channel Phased array, which has the advantage of producing a large area with high SNR. The SNR of both surface coil and 2-channel array was compared with a transceiver Saddle Crossed coil, available at our lab, specific designed to obtain rat brain images. These results have corroborated that transmit-only and receive-only RF coils have best performance than transceiver volume coils for obtain MRI images of rats brain, allowing image acquisition with same resolution and reduced scan time.
Ferrand, Guillaume. "Antennes reseaux pour la transmission parallele en irm a ultra haut champ : conception, réalisation et stratégie de pilotage." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00647901.
Повний текст джерелаConsalter, 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/.
Повний текст джерелаParallel techniques and dedicated hardware has been developed since the 1980s to reduce acquisition time on Magnetic Resonance Imaging (MRI) scanners. A phased array is a receiver only mode device concept, which uses multiple channels (coils) with their own detection circuits to simultaneously acquire MRI or localized spectroscopic signals. An example of parallel imaging technique that uses phased array coils is Sensitivy Enconding (SENSE). Sampled array is the name proposed in this work for a method in which each channel of a multichannel coil is responsible to acquire independently the signal from its sample so that each sample signal is addressed to its specific channel. In this work, we describe the development of a four-channel phased array coil for rat head anatomy using flexible printed circuit board (PCB), to operate on a 2T pre-clinical MRI scanner to validate the construction method and usage of flexible PCB as a receiver coil. We also developed a four-channel sample array coil to simultaneously perform the imaging of four seeds at the same scan, to validate the proposed method to improve image quality at the same time accelerating multiple seed imaging for agriculture studies. The results show that phased array PCB coil as compared to a regular wire winding coil provide good signal-to-noise ratio (SNR) imaging with more adequate geometry to the anatomy by being flexible. In addition, the coil manufacturing process is facilitated since the entire coil is constructed as a PCB prototype. The sample array imaging showed as a promising method for multiple sample increasing SNR and time to do experiments.
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.
Повний текст джерелаXie, 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.
Повний текст джерелаKriegl, Roberta. "A flexible coil array for high resolution magnetic resonance imaging at 7 Tesla." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112425/document.
Повний текст джерелаMagnetic resonance imaging (MRI), among other imaging techniques, has become a major backbone of modern medical diagnostics. MRI enables the non-invasive combined, identification of anatomical structures, functional and chemical properties, especially in soft tissues. Nonetheless, applications requiring very high spatial and/or temporal resolution are often limited by the available signal-to-noise ratio (SNR) in MR experiments. Since first clinical applications, image quality in MRI has been constantly improved by applying one or several of the following strategies: increasing the static magnetic field strength, improvement of the radiofrequency (RF) detection system, development of specialized acquisition sequences and optimization of image reconstruction techniques. This work is concerned with the development of highly sensitive RF detection systems for biomedical ultra-high field MRI. In particular, auto-resonant RF coils based on transmission line technology are investigated. These resonators may be fabricated on flexible substrate which enables form-fitting of the RF detector to the target anatomy, leading to a significant SNR gain. The main objective of this work is the development of a flexible RF coil array for high-resolution MRI on a human whole-body 7 T MR scanner. With coil arrays, the intrinsically high SNR of small surface coils may be exploited for an extended field of view. Further, parallel imaging techniques are accessible with RF array technology, allowing acceleration of the image acquisition. Secondly, in this PhD project a novel design for transmission line resonators is developed, that brings an additional degree of freedom in geometric design and enables the fabrication of large multi-turn resonators for high field MR applications. This thesis describes the development, successful implementation and evaluation of novel, mechanically flexible RF devices by analytical and 3D electromagnetic simulations, in bench measurements and in MRI experiments
Sewonu, Anou. "Développements méthodologiques et techniques pour le contrôle qualité en imagerie par résonance magnétique." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0002/document.
Повний текст джерелаMagnetic Resonance Imaging (MRI) is increasingly being used in clinical routine and is frequently associated with different imaging modalities in multisite studies. Besides, MRI is becoming more complex with a growing use of phased-array coils. Hence there is a rising eagerness for quality assurance and quality control (QC). Indeed, monitoring MR systems is required in order to prevent from diagnostic errors which may be induced by drifts in the instrumentation. The ever first studies about MRI QC issue established the basis for designing test-objects and metrics which are required for monitoring the scanners. These works also resulted in two approaches for performing the testings : the first one is multi-object oriented and the second one is single-object oriented. The research conducted for this thesis are motivated by two objectives : the first one holds about designing a methodology for performing periodic monitoring of MR scanners. The procedure is required to be practical, shortly-timed, statistically robust, and system-independent. It was designed following the single-object approach promoted by the American College of Radiology. In order to fit the procedure with its specifications, all of its aspects were assessed. The resulting 10-minute weekly QC procedure was successfully tested on several MR facilities. The second goal of these works is about specifically assessing the performance of phased-array coils. Using these coils, two parameters were considered as being essential for image quality considerations, namely the sensitivity profiles and the noise covariance matrix. For monitoring these parameters, two metrics were designed in a way that they could be integrated within the weekly QC procedure. Besides, an alternative method was proposed for computing noise covariance matrices. As a matter of prospects, these doctoral works sought clinical applications which may take advantage of the techniques and methodology elaborated for QC purposes. There are interesting insights about using QC techniques in support of targeted clinical MR applications
Bhatia, Sahil. "Geometrically Decoupled Phased Array Coils for Mouse Imaging." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-797.
Повний текст джерелаHsu, Cheng-yun, and 許正昀. "Investigation on Absolute Quantification of in Vivo Proton MR Spectroscopy with Phased Array Coils." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74cm44.
Повний текст джерела國立中山大學
資訊工程學系研究所
96
LCModel has been widely used for MR spectroscopy analysis. LCMgui, which is the built-in user interface of LCModel, based on Linux system, provides the functionality to convert MRS data of various formats to match the format of LCModel raw file, except for GE MRSI data which can be analyzed by LCModel only with GE Sage/IDL software. Hence, the first part of this work was to develop a multi-platform tool with LCModel to support all GE data, including GE MRSI data and phased array data. With this tool, users can analyze MRS data with LCModel on their familiar environment such as Windows, and Linux. The MR spectroscopy experiments with phased array coils provide optimized SNR which lead to more accurate absolute quantification by some sophisticate combination algorithms of phased array coils. Thus, the second part of this work was to propose an algorithm of combining data obtained from phased array coils by doing phase correction and calculation of weighting factor. In addition, the comparison of the accuracy between using quadrature coil and phased array coils with different combination algorithms was investigated in order to demonstrate the efficiency of using phased array coils and the combination program.
Частини книг з теми "Phased array coils"
Giovannetti, G., V. Viti, V. Hartwig, F. Frijia, and L. Landini. "Simulations of Magnetic Resonance Phased Array Coils Using FDTD Algorithm." In IFMBE Proceedings, 888–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03882-2_237.
Повний текст джерелаVemuri, Prashanthi, Eugene G. Kholmovski, Dennis L. Parker, and Brian E. Chapman. "Coil Sensitivity Estimation for Optimal SNR Reconstruction and Intensity Inhomogeneity Correction in Phased Array MR Imaging." In Lecture Notes in Computer Science, 603–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11505730_50.
Повний текст джерелаТези доповідей конференцій з теми "Phased array coils"
Morey, Abhay M., Sheetal Bhujade, Tapas Bhuiya, Samruddha Thakur, and Twisha Pandey. "Design and development of phased-array coils for 1.5T MRI scanner." In 2015 International Conference on Technological Advancements in Power and Energy (TAP Energy). IEEE, 2015. http://dx.doi.org/10.1109/tapenergy.2015.7229611.
Повний текст джерелаBasari, Eko Tjipto Rahardjo, and Fitri Yuli Zulkifli. "Eight-channel phased array RF coils design for 3T parallel MRI system." In 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2015. http://dx.doi.org/10.1109/apcap.2015.7374269.
Повний текст джерелаMarrufo, O., and A. O. Rodriguez. "Study of optimal separation of two circular phased-array coils via an equivalent circuit." In 2005 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2005. http://dx.doi.org/10.1109/iembs.2005.1615411.
Повний текст джерелаLiang, Dandan, Hon Tat Hui, and Tat Soon Yeo. "Design of phased array coils for increasing the signal-to-noise ratio of magnetic resonance imaging." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6349160.
Повний текст джерелаChen, Zhenmao, Yongbin Zuo, Dongli Zhang, Ying Mao, and Taihui Huang. "Proposal and Demonstration of Strategies for NDT of Conduit Tube of Cable in Conduit Conductors Used in ITER PF Coils." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29901.
Повний текст джерелаYu Li, Hua Wang, Feng Liu, Bing Keong Li, Guofa Shou, Ewald Weber, and Stuart Crozier. "A comparison study of regularization techniques on the theoretical design of phased array RF coils in MRI." In 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2008. http://dx.doi.org/10.1109/iembs.2008.4649184.
Повний текст джерелаMartini, N., M. F. Santarelli, M. Milanesi, G. Giovannetti, V. Positano, N. Vanello, and L. Landini. "Signal-to-noise ratio improvement of cardiac magnetic resonance spectroscopy signals acquired by phased array coils: a simulation based approach." In 4th IET International Conference on Advances in Medical, Signal and Information Processing (MEDSIP 2008). IEE, 2008. http://dx.doi.org/10.1049/cp:20080445.
Повний текст джерелаNguyen, Vu Huy, and Won-jong Kim. "A Two-Phase Framework for Linear Permanent-Magnet Machines and Multi-Axis Stages With Magnetic Levitation." In ASME 2014 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/dscc2014-5936.
Повний текст джерелаBurat, Olivier, Marc Piriou, Yann Kernin, Mikael Debroise, Christophe Moreau, Samuel W. Glass, and Olivier Casula. "Inspection of Bottom Mounted Instrumentation (BMI) J-Weld." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-26173.
Повний текст джерелаOmar, Abbas. "RF Coils of Magnetic-Resonance Imaging as Phased Arrays." In 2018 IEEE Conference on Antenna Measurements & Applications (CAMA). IEEE, 2018. http://dx.doi.org/10.1109/cama.2018.8530674.
Повний текст джерела