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Comparison of 16-channel asymmetric sleeve antenna and dipole antenna transceiver arrays at 10.5 Tesla MRI
2020
IEEE Transactions on Medical Imaging
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Multi-element transmit arrays with low peak 10 g specific absorption rate (SAR) and high SAR efficiency (defined as (B1+/√peakSAR10g) are essential for ultra-high field (UHF) magnetic resonance imaging ...
(MRI) applications. ...
INTRODUCTION agnetic resonance imaging (MRI) at ultra-high fields (UHF, defined as ≥7 tesla (T)) are increasingly pursued for biomedical research due to gains in signal-to-noise [1] [2] [3] [4] and, ...
doi:10.1109/tmi.2020.3047354
pmid:33360987
pmcid:PMC8078892
fatcat:rpt2tqqi7fgtlkwvc3y6pb3kve
Effect of RF coil excitation on field inhomogeneity at ultra high fields: a field optimized TEM resonator
2001
Magnetic Resonance Imaging
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In this work, computational methods were utilized to optimize the field produced by the transverse electromagnetic (TEM) resonator in the presence of the human head at 8 Tesla. ...
Optimization was achieved through the use of the classical finite difference time domain (FDTD) method and a TEM resonator loaded with an anatomically detailed human head model with a resolution of 2 mm ...
Introduction In high field (Ͼ4 Tesla) MRI systems, a major challenge is the design of RF coils that exhibit a good signal to noise ratio, transverse magnetic (B 1 ) field uniformity, and low specific absorption ...
doi:10.1016/s0730-725x(01)00404-0
pmid:11804762
fatcat:xccxpzaknfgqjgesjdvhazakne
Endourethral MRI
2001
Magnetic Resonance in Medicine
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This study introduces an endourethral approach for ultra-high-resolution MRI of the female urethra and the periurethral tissues. ...
To this end, two different radiofrequency (RF) receiver coil designs for an endourethral insertion have been developed: a single-loop coil and a phased array/quadrature coil. ...
., for providing the flexible coil circuits and fabricating the prototype coil used in the in vivo pig experiments. Ergin Atalar is a co-founder and consultant of Surgi-Vision, Inc. ...
doi:10.1002/1522-2594(200101)45:1<138::aid-mrm1018>3.0.co;2-g
pmid:11146495
fatcat:kkykrmca2ffrdhoyngf3cjl3km
Shielded Microstrip Array for 7T Human MR Imaging
2010
IEEE Transactions on Medical Imaging
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The high-frequency transceiver array based on the microstrip transmission line design is a promising technique for ultrahigh field magnetic resonance imaging (MRI) signal excitation and reception. ...
In this paper, we present an approach to improving the performance of microstrip transceiver arrays by introducing RF shielding outside the microstrip array and the feeding coaxial cables. ...
Lu for manuscript editing and proofreading. ...
doi:10.1109/tmi.2009.2033597
pmid:19822470
pmcid:PMC2834268
fatcat:7ldq7tc4rbgyrhgodm6ncwly74
A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
2021
Sensors
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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). ...
, MN, USA) for their help with 3D printing, discussion and feedback. ...
doi:10.3390/s21217250
pmid:34770558
pmcid:PMC8587099
fatcat:rqvu5xn75bfazavu7jd7kgx7ce
Mitigation of B1+ inhomogeneity for ultra-high-field magnetic resonance imaging: hybrid mode shaping with auxiliary EM potential
2020
Scientific Reports
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Here, we show that the same concept provides an opportunity for the seemingly different field of ultra-high-field MRI, addressing transmit RF magnetic field (B1+) inhomogeneity. ...
In this work, treating the human phantom as a resonator, we employ an evanescently coupled high-index cladding layer to study the effects of the auxiliary potential on shaping the B1+ field distribution ...
Here, we show that the same concept provides an opportunity for the seemingly different field of ultra-high-field MRI, addressing transmit RF magnetic field (B 1 + ) inhomogeneity. ...
doi:10.1038/s41598-020-68651-6
pmid:32678182
fatcat:hzgf2iqucjcn5dhsnaplr7worm
Monopole antenna array design for 3 T and 7 T magnetic resonance imaging
2019
PLoS ONE
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Ultra-high field magnetic resonance imaging poses a number of challenges for robust radio frequency coil designs. ...
A monopole antenna array can potentially overcome key limitations of birdcage coil designs and may provide a useful radio frequency coil for brain imaging. ...
Acknowledgments The authors would like to thank the Australian Research Council for linkage project funding (LP130100703). ...
doi:10.1371/journal.pone.0214637
pmid:30933999
pmcid:PMC6443181
fatcat:ce5elkeavff2dfxl5aox3ejytu
2019 Index IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Vol. 3
2019
IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology
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., +, JERM March 2019 33-40
RF Aspects of High-Field Magnetic Resonance Imaging (HF-MRI): Recent
Advances. ...
., +, JERM Dec. 2019 247-253 Transmitters RF Aspects of High-Field Magnetic Resonance Imaging (HF-MRI): Recent Advances. ...
doi:10.1109/jerm.2019.2961617
fatcat:dfd7p3illffq3fu5ajeu4w7boa
Hardware of MRI System
[chapter]
2019
Nuclear Magnetic Resonance [Working Title]
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The development of MRI system toward high magnetic field strength will acquire high signal-to-noise ratio (SNR) and resolution, and meanwhile the manufacture difficulty of main magnet, gradient assembly ...
Magnetic resonance imaging (MRI) is comprehensively applied in modern medical diagnosis and scientific research for its superb soft-tissue imaging quality and non-radiating characteristics. ...
Hardware of MRI System DOI: http://dx.doi.org/10.5772/intechopen.89132 ...
doi:10.5772/intechopen.89132
fatcat:ighjupiaxbbbxoa5aaodkpuzla
Fast field-cycling magnetic resonance imaging
2010
Comptes rendus. Physique
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Nevertheless, FFC-MRI has a number of significant applications and advantages over conventional techniques, and is being pursued in a number of laboratories. ...
Different approaches to magnet design for FFC-MRI are also described. ...
As is typical of this type of system, the readout magnet is designed for high homogeneity (as required for MRI), but relatively low field (24 -52 mT). ...
doi:10.1016/j.crhy.2010.06.012
fatcat:rwo7y5z22bdildnpdyujci4aoi
Recent Progress in Birdcage RF Coil Technology for MRI System
2020
Diagnostics
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Among numerous practical designs of RF coils for NMR imaging, the birdcage RF coil is the most popular choice from low field to ultra-high field MRI systems. ...
This article provides a detailed review of the recent progress in the birdcage RF coil technology for the MRI system. ...
However, the design of the birdcage coils for ultra-high field MRI applications is a challenging task. ...
doi:10.3390/diagnostics10121017
pmid:33261167
pmcid:PMC7759766
fatcat:usgcw3nydbcntdxbciii7idtrm
A Self-Decoupled 32 Channel Receive Array for Human Brain Magnetic Resonance Imaging at 10.5T
[article]
2020
arXiv
pre-print
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Methods: A self-decoupled 32-channel receive array for human brain imaging at 10.5T (10.5T-32Rx), consisting of 31 loops and one cloverleaf element, was co-designed and built in tandem with a 16-channel ...
Here, we investigate SNR and parallel imaging gains at 10.5 Tesla (T) compared to 7T using 32-channel receive arrays at both fields. ...
ACKNOWLEDGMENT The authors acknowledge the constructive feedback of Myung Kyun Woo, Lance DelaBarre, Yigitcan Eryaman, and Matt Waks (all with Center for Magnetic Resonance Research, University of Minnesota ...
arXiv:2009.07163v2
fatcat:b6kxnus2ajaklmgipgat25lhfy
Sodium Radiofrequency Coils for Magnetic Resonance: From Design to Applications
2021
Electronics
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With the available magnetic fields for clinical MRI scanners (1.5 T, 3 T, 7 T), and the hardware capabilities such as strong gradient strengths with high slew rates and new dedicated radiofrequency (RF ...
for sodium MRI. ...
Surface and Volume Dual-Tuned Sodium/Hydrogen Coils The simulation and the design of a dual-tuned sodium/hydrogen surface RF coil for knee MR imaging with an Ultra High Field (UHF) 7 T MRI scanner is described ...
doi:10.3390/electronics10151788
fatcat:l3zxu4zbkfho7d4gcmkf2dykvm
Flexible multi-turn multi-gap coaxial RF coils: design concept and implementation for Magnetic Resonance Imaging at 3 and 7 Tesla
2021
IEEE Transactions on Medical Imaging
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It is demonstrated that this enables free choice of the coil diameter, and thus, optimizing it for the application to a certain anatomical site, while operating at the selfresonance frequency. ...
Possible configurations regarding size, number of turns and gaps, and cable types for different B0 field strengths are calculated. ...
The range is almost continuous up to 30 cm in diameter and discontinuities only appear at ultra-high field. ...
doi:10.1109/tmi.2021.3051390
pmid:33439836
fatcat:7juhd5drtjblppo7te7gwngx4q
Microwave and RF Heating for Medical Application under Noninvasive Temperature Measurement Using Magnetic Resonance
2010
Journal of the Korean Institute of Electromagnetic Engineering and Science
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RF for heating inside the sample as artificial dielectrics. ...
The temperature measuring procedure under MR is to measure phase shift of T1, which is the longitudinal relaxation time of proton, for the position inside a sample material with the application of pulsed ...
going straight forward for ultra high frequency EM wave as X-ray is not available [7] . ...
doi:10.5515/jkiees.2010.10.4.244
fatcat:yiv7xiyqbfb2fg7blwvubex6um
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