Hardware Considerations in Ultra High Field MRI

2007 ◽  
pp. 45-57
Author(s):  
Douglas A. C. Kelley
Keyword(s):  
High Field ◽  
Ultra High Field ◽  
High Field Mri ◽  
Ultra High Field Mri

scholarly journals Effect of radiofrequency shield diameter on signal‐to‐noise ratio at ultra‐high field MRI

2021 ◽  
Vol 85 (6) ◽  
pp. 3522-3530
Author(s):  
Bei Zhang ◽  
Gregor Adriany ◽  
Lance Delabarre ◽  
Jerahmie Radder ◽  
Russell Lagore ◽  
...  
Keyword(s):  
High Field ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Ultra High Field ◽  
High Field Mri ◽  
Ultra High Field Mri ◽  
Noise Ratio

An Electrically Long Ultra-High Field MRI Volume Body Coil Design

2021 ◽  
Author(s):  
Sayim Gokyar ◽  
Henning U. Voss ◽  
Fraser Robb ◽  
Douglas J. Ballon ◽  
Simone Angela Winkler
Keyword(s):  
High Field ◽  
Coil Design ◽  
Ultra High Field ◽  
High Field Mri ◽  
Body Coil ◽  
Ultra High Field Mri

scholarly journals Ultra high field MRI (150 micron) assessment of the structural elements of the knee entheses in healthy subjects

Bone Reports ◽  
2020 ◽  
Vol 13 ◽  
pp. 100525
Author(s):  
Damien Roche ◽  
Constance Michel ◽  
Pierre Daudé ◽  
Arnaud Le Troter ◽  
Christophe Chagnaud ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
High Field ◽  
Structural Elements ◽  
Ultra High Field ◽  
High Field Mri ◽  
Ultra High Field Mri

In vivo manganese tract tracing of frontal eye fields in rhesus macaques with ultra-high field MRI: Comparison with DWI tractography

NeuroImage ◽  
2018 ◽  
Vol 181 ◽  
pp. 211-218 ◽  
Author(s):  
David J. Schaeffer ◽  
Kevin D. Johnston ◽  
Kyle M. Gilbert ◽  
Joseph S. Gati ◽  
Ravi S. Menon ◽  
...  
Keyword(s):  
High Field ◽  
Rhesus Macaques ◽  
Frontal Eye Fields ◽  
Tract Tracing ◽  
Ultra High Field ◽  
High Field Mri ◽  
Ultra High Field Mri

SUITer: An Automated Method for Improving Segmentation of Infratentorial Structures at Ultra‐High‐Field MRI

2019 ◽  
Vol 30 (1) ◽  
pp. 28-39 ◽  
Author(s):  
Mohamed Mounir El Mendili ◽  
Maria Petracca ◽  
Kornelius Podranski ◽  
Lazar Fleysher ◽  
Sirio Cocozza ◽  
...  
Keyword(s):  
High Field ◽  
Ultra High Field ◽  
High Field Mri ◽  
Automated Method ◽  
Ultra High Field Mri

Nanomagnets for ultra-high field MRI: Magnetic properties and transverse relaxivity of silica-coated ε-Fe2O3

2019 ◽  
Vol 480 ◽  
pp. 154-163 ◽  
Author(s):  
Lenka Kubíčková ◽  
Petr Brázda ◽  
Miroslav Veverka ◽  
Ondřej Kaman ◽  
Vít Herynek ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
High Field ◽  
Ultra High Field ◽  
High Field Mri ◽  
Ultra High Field Mri

scholarly journals The “Loopole” Antenna: A Hybrid Coil Combining Loop and Electric Dipole Properties for Ultra-High-Field MRI

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Karthik Lakshmanan ◽  
Martijn Cloos ◽  
Ryan Brown ◽  
Riccardo Lattanzi ◽  
Daniel K. Sodickson ◽  
...  
Keyword(s):  
Current Distribution ◽  
Electric Dipole ◽  
High Field ◽  
High Performance ◽  
Signal To Noise Ratio ◽  
Ultra High Field ◽  
High Field Mri ◽  
Electric Dipoles ◽  
Ultra High Field Mri ◽  
Free Current

Purpose. To revisit the “loopole,” an unusual coil topology whose unbalanced current distribution captures both loop and electric dipole properties, which can be advantageous in ultra-high-field MRI. Methods. Loopole coils were built by deliberately breaking the capacitor symmetry of traditional loop coils. The corresponding current distribution, transmit efficiency, and signal-to-noise ratio (SNR) were evaluated in simulation and experiments in comparison to those of loops and electric dipoles at 7 T (297 MHz). Results. The loopole coil exhibited a hybrid current pattern, comprising features of both loops and electric dipole current patterns. Depending on the orientation relative to B0, the loopole demonstrated significant performance boost in either the transmit efficiency or SNR at the center of a dielectric sample when compared to a traditional loop. Modest improvements were observed when compared to an electric dipole. Conclusion. The loopole can achieve high performance by supporting both divergence-free and curl-free current patterns, which are both significant contributors to the ultimate intrinsic performance at ultra-high field. While electric dipoles exhibit similar hybrid properties, loopoles maintain the engineering advantages of loops, such as geometric decoupling and reduced resonance frequency dependence on sample loading.

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