Bibliographies thématiques / Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI)

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Littérature scientifique sur le sujet « Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI) »

Auteur : Grafiati

Publié le 14 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI)"

Bolin Qin and Jia-Hong Gao. "Ultrahigh-Field Magnetic Resonance Imaging: Current Status and Perspectives." Acta Physica Sinica 74, no. 7 (2025): 0. https://doi.org/10.7498/aps.74.20241759.

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Magnetic resonance imaging (MRI) is one of the most important imaging modalities used in clinical radiology research and diagnosis due to its non-invasive nature, absence of ionizing radiation, high soft tissue contrast, and diverse imaging capabilities. However, traditional MRI is limited by a relatively low signal-to-noise ratio (SNR), which can be enhanced by increasing the strength of the main magnetic field. Ultra-high field MRI (UHF-MRI), an emerging technology, typically refers to MRI systems with a main magnetic field strength of 7 T or higher. Compared to conventional MRI, UHF-MRI imp

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Chang, Catie, Erika P. Raven, and Jeff H. Duyn. "Brain–heart interactions: challenges and opportunities with functional magnetic resonance imaging at ultra-high field." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2067 (2016): 20150188. http://dx.doi.org/10.1098/rsta.2015.0188.

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Magnetic resonance imaging (MRI) at ultra-high field (UHF) strengths (7 T and above) offers unique opportunities for studying the human brain with increased spatial resolution, contrast and sensitivity. However, its reliability can be compromised by factors such as head motion, image distortion and non-neural fluctuations of the functional MRI signal. The objective of this review is to provide a critical discussion of the advantages and trade-offs associated with UHF imaging, focusing on the application to studying brain–heart interactions. We describe how UHF MRI may provide contrast and reso

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Roche, D., C. Michel, P. Daudé, et al. "AB1098 STRUCTURAL ELEMENTS OF THE KNEE ENTHESES ASSESSED IN HEALTHY SUBJECTS WITH ULTRA HIGH FIELD MRI (150 MICRONS)." Annals of the Rheumatic Diseases 79, Suppl 1 (2020): 1838. http://dx.doi.org/10.1136/annrheumdis-2020-eular.1191.

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Background:Fibrocartilaginous enthesis is composed of different histological zones which are commonly referred to the tendon distal extremity (a lamellar tissue with a low cell density, collagen and connective tissue), the fibrocartilaginous zone (with chondrocytes), a progressively mineralized zone and the bone. The MRI visualization of the water content of entheses is challenging given the very short relation time so that entheses has been very poorly assessed using MRI (1).Objectives:The main objective of the study was to assess the structural elements of the knee enthesis based on the quan

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Seo, Jeung-Hoon, Yeji Han, and Jun-Young Chung. "A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging." Sensors 22, no. 5 (2022): 1741. http://dx.doi.org/10.3390/s22051741.

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Improvements in transmission and reception sensitivities of radiofrequency (RF) coils used in ultra-high field (UHF) magnetic resonance imaging (MRI) are needed to reduce specific absorption rates (SAR) and RF power deposition, albeit without applying high-power RF. Here, we propose a method to simultaneously improve transmission efficiency and reception sensitivity of a band-pass birdcage RF coil (BP-BC RF coil) by combining a multi-channel wireless RF element (MCWE) with a high permittivity material (HPM) in a 7.0 T MRI. Electromagnetic field (EM-field) simulations, performed using two types

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Isaacs, Bethany R., Max C. Keuken, Anneke Alkemade, Yasin Temel, Pierre-Louis Bazin, and Birte U. Forstmann. "Methodological Considerations for Neuroimaging in Deep Brain Stimulation of the Subthalamic Nucleus in Parkinson’s Disease Patients." Journal of Clinical Medicine 9, no. 10 (2020): 3124. http://dx.doi.org/10.3390/jcm9103124.

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Deep brain stimulation (DBS) of the subthalamic nucleus is a neurosurgical intervention for Parkinson’s disease patients who no longer appropriately respond to drug treatments. A small fraction of patients will fail to respond to DBS, develop psychiatric and cognitive side-effects, or incur surgery-related complications such as infections and hemorrhagic events. In these cases, DBS may require recalibration, reimplantation, or removal. These negative responses to treatment can partly be attributed to suboptimal pre-operative planning procedures via direct targeting through low-field and low-re

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Wang, Xi, Shao Ying Huang, and Abdulkadir C. Yucel. "Uncertainty Quantification in SAR Induced by Ultra-High-Field MRI RF Coil via High-Dimensional Model Representation." Bioengineering 11, no. 7 (2024): 730. http://dx.doi.org/10.3390/bioengineering11070730.

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As magnetic field strength in Magnetic Resonance Imaging (MRI) technology increases, maintaining the specific absorption rate (SAR) within safe limits across human head tissues becomes challenging due to the formation of standing waves at a shortened wavelength. Compounding this challenge is the uncertainty in the dielectric properties of head tissues, which notably affects the SAR induced by the radiofrequency (RF) coils in an ultra-high-field (UHF) MRI system. To this end, this study introduces a computational framework to quantify the impacts of uncertainties in head tissues’ dielectric pro

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Periyasamy, M., and R. Dhanasekaran. "IMPLEMENTATION OF RADIO FREQUENCY IDENTIFICATION DEVICES IN 0.3 TESLA MAGNETIC RESONANCE IMAGING AND COMPUTED TOMOGRAPHY." Biomedical Engineering: Applications, Basis and Communications 26, no. 06 (2014): 1450069. http://dx.doi.org/10.4015/s1016237214500690.

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The aim of this work was to assess two issues concerning magnetic resonance imaging (MRI) including device functionality and image artifacts for the presence of ultra high frequency (UHF) radio frequency identification (RFID) devices in connection with 0.3 Tesla at 12.7 MHz MRI and computed tomography (CT) scanning. A total of 15 samples of RFID tags with two dissimilar sizes (wristband and ID card types) were tested. The tags were exposed to a several numbers of MR-imaging conditions during MRI examination and X-rays of CT scan. During the test, the tags were oriented in three different direc

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Garcia, Maíra M., Khallil T. Chaim, Maria C. G. Otaduy, et al. "Investigating the influence of dielectric pads in 7T magnetic resonance imaging – simulated and experimental assessment." Current Directions in Biomedical Engineering 6, no. 3 (2020): 24–27. http://dx.doi.org/10.1515/cdbme-2020-3007.

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AbstractDipole radiofrequency (RF) elements have been successfully used to compose multi-channel RF coils for ultrahigh fields (UHF) magnetic resonance imaging (MRI). As magnetic components of RF fields (B1) can be very inhomogeneous at UHF (B0≥7T), dielectric pads with high dielectric constants were proposed to improve the B1 efficiency and homogeneity [1]. Dielectric pads can be used as a passive B1 shimmimg technique thanks to inducing a strong secondary magnetic field in their vicinity. The use of such dielectric pads affect not only the B1 field but also the electric field. This in turn a

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Seo, Jeung-Hoon, Young-Seung Jo, Chang-Hyun Oh, and Jun-Young Chung. "A New Combination of Radio-Frequency Coil Configurations Using High-Permittivity Materials and Inductively Coupled Structures for Ultrahigh-Field Magnetic Resonance Imaging." Sensors 22, no. 22 (2022): 8968. http://dx.doi.org/10.3390/s22228968.

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In ultrahigh-field (UHF) magnetic resonance imaging (MRI) system, the RF power required to excite the nuclei of the target object increases. As the strength of the main magnetic field (B0 field) increases, the improvement of the RF transmit field (B1+ field) efficiency and receive field (B1− field) sensitivity of radio-frequency (RF) coils is essential to reduce their specific absorption rate and power deposition in UHF MRI. To address these problems, we previously proposed a method to simultaneously improve the B1+ field efficiency and B1− field sensitivity of 16-leg bandpass birdcage RF coil

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Woo, Myung Kyun, Lance DelaBarre, Matt Waks, et al. "A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla." Sensors 21, no. 21 (2021): 7250. http://dx.doi.org/10.3390/s21217250.

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For ultra-high field and frequency (UHF) magnetic resonance imaging (MRI), the associated short wavelengths in biological tissues leads to penetration and homogeneity issues at 10.5 tesla (T) and require antenna transmit arrays for efficiently generated 447 MHz B1+ fields (defined as the transmit radiofrequency (RF) magnetic field generated by RF coils). Previously, we evaluated a 16-channel combined loop + dipole antenna (LD) 10.5 T head array. While the LD array configuration did not achieve the desired B1+ efficiency, it showed an improvement of the specific absorption rate (SAR) efficiency

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Thèses sur le sujet "Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI)"

MAGGIORELLI, FRANCESCA. "Design and Development of Radio Frequency Coils for Sodium Magnetic Resonance Imaging at 7 T." Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1066803.

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The main goal of this Thesis is the design and development of Radio-Frequency (RF) coils for sodium Magnetic Resonance Imaging (MRI) at Ultra High Field (UHF). The advantage of using UHF MR scanners is due to the possibility to achieve improved Signal-to-Noise-Ratio (SNR) and spatial resolution. These characteristics are fundamental in case of imaging with nuclei different from proton, which provide an intrinsically lower signal because of their lower in-vivo concentration and lower gyromagnetic ratio. Moreover, the overlap between sodium and proton images allows the accurate localization of r

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Jones, Alexa. "Radio frequency coils for ultra-high field MRI." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490979.

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The push toward higher magnetic fields in MRI has consistently thrown up new challenges in hardware development. The recent development of a new generation of ultra-high field scanners for human imaging is no exception. The earch presented in this thesis aims to provide solutions to new technical challenges in radio-frequency probe design. All probe designs were developed for use at 7T on a Philips Acheiva full body scanner.

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Liang, Jiachao. "Dynamic Contrast Enhanced Magnetic Resonance Imaging at High and Ultra-high Fields." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228327344.

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Burgess, Richard Ely. "Magnetic resonance imaging at ultra high field implications for human neuroimaging /." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1089949841.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xiv, 222 p. : ill. (some col.). Advisor: Pierre-Marie Luc Robitaille, Dept. of Emergency Medicine. Includes bibliographical references.

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Al, Mohamad Zakriya Ali E. "Quantitative assessment of the biochemical composition of equine cartilage using 7T ultra-high field magnetic resonance imaging (MRI) techniques." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/8227/.

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Equine fetlock region disease is responsible for significant morbidity and mortality. Diagnosis of sesamoidean ligament, cartilage and subchondral bone injury has been obtained by clinical MRI. Low-field MRI provides images helpful in the investigation of MCPJ/MTPJ region pathology in horses in the clinical setting but the greater resolution of high and ultra-field MR images has the potential to aid interpretation through a better understanding of MRI anatomy. Quantitative MRI could provide a non-invasive technique to determine tissue biochemical properties associated with the early onset of a

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Beaujoin, Justine. "Post mortem inference of the human brain microstructure using ultra-high field magnetic resonance imaging with strong gradients." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS448/document.

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L’ambition des très hauts champs magnétiques (≥ 7T) à forts gradients (≥ 300mT/m) est de dépasser la résolution millimétrique imposée à plus bas champ pour atteindre l’échelle mésoscopique en neuroimagerie. Etudier le cerveau à cette échelle est essentiel pour comprendre le lien entre fonction et substrat anatomique. Malgré les progrès réalisés sur les aimants cliniques à 7T, il n’en est pas de même des gradients. Cette thèse vise à cartographier le cerveau humain à l’échelle mésoscopique via l’étude de pièces anatomiques post mortem. Une approche alternative a été choisie, reposant sur l'util

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Comby, Pierre-Antoine. "From Compressed Sensing to deep learning based methods for functional Magnetic Resonance Imaging reconstruction at ultra-high field." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPAST031.

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L'imagerie par résonance magnétique fonctionnelle (IRMf) est une technique d'imagerie cérébrale largement utilisée, basée sur l'effet BOLD (Blood Oxygenation Level Dependent), un indicateur indirect de l'activité neuronale. L'IRMf est confrontée à un compromis entre la résolution spatiale, la résolution temporelle, le rapport signal sur bruit et la couverture cérébrale. Atteindre une couverture complète du cerveau avec une haute résolution spatiale et temporelle reste un défi. Cette thèse de doctorat vise à améliorer les étapes d'acquisition et de reconstruction du pipeline IRMf afin d'atteind

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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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Poirion, Emilie. "Biological mechanisms driving neurodegeneration in Multiple Sclerosis : an in vivo approach combining positron emission tomography and high field magnetic resonance imaging." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS327.

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La sclérose en plaques (SEP) est une maladie inflammatoire démyélinisante du système nerveux central, qui représente la première cause de handicap non-traumatique du jeune adulte. Il a été démontré que le principal mécanisme impliqué dans la progression du handicap était une atteinte neuronale dégénérative. Les mécanismes à l’origine de la neurodégénérescence sont cependant peu connus in vivo. Des études post-mortem ont mis en évidence le rôle d’une inflammation persistante impliquant le système immunitaire innée, en association avec un échec de la remyélination dans la substance blanche ainsi

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Chapitres de livres sur le sujet "Ultra-High-Field (UHF) Magnetic Resonance Imaging (MRI)"

Tapp, Austin, Rahimeh Rouhi, Jeffrey Tanedo, et al. "Quality Assurance and Hippocampal Segmentation on Low-Field Pediatric Magnetic Resonance Images." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-83008-2_6.

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Abstract Portable ultra-low-field (uLF, i.e., 0.064T) magnetic resonance imaging (MRI) offers a solution to scarce radiological alternatives of resource-limited regions; however, in such regions, MRI system operators and radiologists are novices to the underrepresented modality. Therefore, automatic methods that confirm image acquisition of appropriate quality for diagnosis and segment and measure critical anatomical structures are required to support rural sites. This paper describes our approach to two tasks presented in the LISA 2024 Challenge: (1) quality assurance of pediatric low-field M

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"16 Ultra-high-field magnetic resonance imaging (UHF MRI)On the Horizon: Ultra-High-Field MR." In Brain Tumor Imaging, edited by Rajan Jain and Marco Essig. Georg Thieme Verlag, 2016. http://dx.doi.org/10.1055/b-0035-122307.

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van den Wildenberg, Lieke, Jannie P. Wijnen, and Dennis W. J. Klomp. "Metabolic imaging using ultra-high field MRI." In Advances in Magnetic Resonance Technology and Applications. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-822729-9.00017-5.

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Robson, Matthew. "7 T cardiac imaging." In The EACVI Textbook of Cardiovascular Magnetic Resonance, edited by Massimo Lombardi, Sven Plein, Steffen Petersen, et al. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198779735.003.0062.

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By increasing the field strength of the magnet used for magnetic resonance imaging (MRI), the available signal from the patient is enhanced, and this basic physics principle has driven the clinical MRI market to ever higher field strengths. Seven Tesla (7 T) scanners yield 4-5 times more signal than 1.5 T scanners; this signal-to-noise ratio increase facilitates high-resolution imaging, faster imaging when using accelerated techniques such as SENSE and GRAPPA, and greater sensitivity to low-concentration metabolites. Magnetic resonance spectroscopy acquisitions also benefit, owing to the great

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