Open birdcage coil for head imaging at 7T

2021 ◽  
Author(s):  
Anton V. Nikulin ◽  
Alexandre Vignaud ◽  
Nikolai I. Avdievich ◽  
Djamel Berrahou ◽  
Julien Rosny ◽  
...  
Keyword(s):  
Birdcage Coil

Impacts of RF shimming on MRI induced heating of implantable medical lead in 3T birdcage coil

2017 ◽  
Author(s):  
Qi Zeng ◽  
Qingyan Wang ◽  
Jianfeng Zheng ◽  
Wolfgang Kainz ◽  
Ji Chen
Keyword(s):  
Birdcage Coil ◽  
Rf Shimming

Combined 23 Na and 13 C imaging at 3.0 Tesla using a single‐tuned large FOV birdcage coil

2021 ◽  
Author(s):  
Joshua D. Kaggie ◽  
Titus Lanz ◽  
Mary A. McLean ◽  
Frank Riemer ◽  
Rolf F. Schulte ◽  
...  
Keyword(s):  
Birdcage Coil ◽  
3.0 Tesla

B1field homogeneity and SAR calculations for the birdcage coil

2001 ◽  
Vol 46 (2) ◽  
pp. 609-619 ◽  
Author(s):  
T S Ibrahim ◽  
R Lee ◽  
B A Baertlein ◽  
P-M L Robitaille
Keyword(s):  
Birdcage Coil

Procedural Development of RF Tx/Rx Circularly Polarized Birdcage Coil at 1.5T MR system

2018 ◽  
Author(s):  
Rutuja Patwardhan ◽  
Shrikant Sonawane ◽  
Rajesh Harsh ◽  
Sandeep Gaikwad
Keyword(s):  
Birdcage Coil ◽  
Circularly Polarized

A quadrature lowpass birdcage coil for a vertical low field MRI scanner

2004 ◽  
Vol 22B (1) ◽  
pp. 1-6 ◽  
Author(s):  
Giulio Giovannetti ◽  
Raffaello Francesconi ◽  
Luigi Landini ◽  
Vittorio Viti ◽  
Maria Filomena Santarelli ◽  
...  
Keyword(s):  
Birdcage Coil ◽  
Low Field ◽  
Low Field Mri

scholarly journals Simulations of a birdcage coil B1+ field on a human body model for designing a 3T multichannel TMS/MRI head coil array

2018 ◽  
Author(s):  
Lucia I. Navarro de Lara ◽  
Laleh Golestani Rad ◽  
Sergey N. Makarov ◽  
Jason Stockmann ◽  
Lawrence L. Wald ◽  
...  
Keyword(s):  
Human Body ◽  
Birdcage Coil ◽  
Human Body Model ◽  
Coil Array ◽  
Body Model ◽  
Head Coil

scholarly journals Potential Reduction of Peripheral Local SAR for a Birdcage Body Coil at 3 Tesla Using a Magnetic Shield

2021 ◽  
Vol 9 ◽  
Author(s):  
C.C. van Leeuwen ◽  
B.R. Steensma ◽  
S.B. Glybovski ◽  
M.F.J. Lunenburg ◽  
C. Simovski ◽  
...  
Keyword(s):  
Eddy Currents ◽  
Periodic Structures ◽  
Ring Resonators ◽  
Scale Model ◽  
Birdcage Coil ◽  
Magnetic Shield ◽  
Body Regions ◽  
Body Coil ◽  
Local Sar ◽  
The Right

The birdcage body coil, the standard transmit coil in clinical MRI systems, is typically a shielded coil. The shield avoids interaction with other system components, but Eddy Currents induced in the shield have an opposite direction with respect to the currents in the birdcage coil. Therefore, the fields are partly counteracted by the Eddy currents, and large coil currents are required to reach the desired B1+ level in the subject. These large currents can create SAR hotspots in body regions close to the coil. Complex periodic structures known as metamaterials enable the realization of a magnetic shield with magnetic rather than electric conductivity. A magnetic shield will have Eddy currents in the same direction as the coil currents. It will allow generating the same B1+ with lower current amplitude, which is expected to reduce SAR hotspots and improve homogeneity. This work explores the feasibility of a birdcage body coil at 3 T with a magnetic shield. Initially, we investigate the feasibility by designing a scale model of a birdcage coil with an anisotropic implementation of a magnetic shield at 7 T using flattened split ring resonators. It is shown that the magnetic shield destroys the desired resonance mode because of increased coil loading. To enforce the right mode, a design is investigated where each birdcage rung is driven individually. This design is implemented in a custom built birdcage at 7 T, successfully demonstrating the feasibility of the proposed concept. Finally, we investigate the potential improvements of a 3 T birdcage body coil through simulations using an idealized magnetic shield consisting of a perfect magnetic conductor (PMC). The PMC shield is shown to eliminate the peripheral regions of high local SAR, increasing the B1+ per unit maximum local SAR by 27% in a scenario where tissue is present close to the coil. However, the magnetic shield increases the longitudinal field of view, which reduces the transmit efficiency by 25%.

Design and use of a folded four-ring double-tuned birdcage coil for rat brain sodium imaging at 9.4 T

2018 ◽  
Vol 286 ◽  
pp. 110-114 ◽  
Author(s):  
YongHyun Ha ◽  
Chang-Hoon Choi ◽  
Wieland A. Worthoff ◽  
Aliaksandra Shymanskaya ◽  
Michael Schöneck ◽  
...  
Keyword(s):  
Rat Brain ◽  
Birdcage Coil ◽  
Sodium Imaging

Degenerate mode band-pass birdcage coil for accelerated parallel excitation

2007 ◽  
Vol 57 (6) ◽  
pp. 1148-1158 ◽  
Author(s):  
Vijayanand Alagappan ◽  
Juergen Nistler ◽  
Elfar Adalsteinsson ◽  
Kawin Setsompop ◽  
Ulrich Fontius ◽  
...  
Keyword(s):  
Birdcage Coil ◽  
Parallel Excitation ◽  
Degenerate Mode ◽  
Band Pass

scholarly journals An Asymmetric Birdcage Coil for Small-animal MR Imaging at 7T

2017 ◽  
Vol 16 (3) ◽  
pp. 253-258 ◽  
Author(s):  
Kyoung-Nam Kim ◽  
Sang-Doc Han ◽  
Jeung-Hoon Seo ◽  
Phil Heo ◽  
Dongkyeom Yoo ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Small Animal ◽  
Birdcage Coil
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