scholarly journals Magnetic resonance imaging with a multi-tunable metamaterial-inspired radiofrequency coil

2021 ◽  
Vol 2015 (1) ◽  
pp. 012171
Author(s):  
V Puchnin ◽  
V Ivanov ◽  
M Gulyaev ◽  
M Zubkov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Wide Frequency Range ◽  
Small Animals ◽  
Coil Design ◽  
Rf Coil ◽  
Resonance Imaging ◽  
Frequency Range ◽  
Radiofrequency Coil ◽  
Tunable Metamaterial

Abstract We present the initial experimental results obtained using a two-part receive/transmit (Rx/Tx) radiofrequency (RF) coil design for small animals magnetic resonance imaging at 7 T. The assembly uses a butterfly-type coil tuned to 300 MHz for scanning the 1H nuclei and a non-resonant antenna with a metamaterial-inspired resonator tunable over wide frequency range for X-nuclei. 1H, 31P, 23Na and 13C are selected as test nuclei in this work. Coil simulations show the two parts of the RF-assembly to be efficiently operating at the required frequencies. Simulations and phantom imaging show sufficiently homogeneous transverse transmit RF fields and tuning capabilities for the pilot heteronuclear experiments.

Radiofrequency Coil Design for in vivo Sodium Magnetic Resonance Imaging of Mouse Kidney at 9.4T

2018 ◽  
Vol 22 (1) ◽  
pp. 65
Author(s):  
Song-I Lim ◽  
Chul-Woong Woo ◽  
Sang-Tae Kim ◽  
Bo-Young Choe ◽  
Dong-Cheol Woo
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mouse Kidney ◽  
Coil Design ◽  
Resonance Imaging ◽  
Radiofrequency Coil

scholarly journals Experimental and numerical investigations of a small animal coil for ultra-high field magnetic resonance imaging (7T)

2019 ◽  
Vol 5 (1) ◽  
pp. 525-528 ◽  
Author(s):  
Maíra M. Garcia ◽  
Tiago R. Oliveira ◽  
Daniel Papoti ◽  
Khallil T. Chaim ◽  
Maria C. G. Otaduy ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Small Animal ◽  
Small Animals ◽  
Rf Coil ◽  
Resonance Imaging ◽  
Ultra High Field ◽  
Good Image Quality ◽  
Magnetic Resonance Imaging Mri ◽  
The University

AbstractThe purpose of this work was to develop and investigate a radiofrequency (RF) coil to perform image studies on small animals using the 7T magnetic resonance imaging (MRI) system, installed in the imaging platform in the autopsy room (Portuguese acronym PISA), at the University of Sao Paulo, Brazil, which is the unique 7T MRI scanner installed in South America. Due to a high demand to create new specific coils for this 7T system, it is necessary to carefully assess the distribution of electromagnetic (EM) fields generated by the coils and evaluate the patient/object safety during MRI procedures. To achieve this goal 3D numerical methods were used to design and analyse a 8-rungs transmit/receive linearly driven birdcage coil for small animals. Calculated magnetic field (B1) distributions generated by the coil were crosschecked with measured results, indicating good confidence in the simulated results. Electric field results were post-processed and predictions of local specific absorption rate (SAR) values were achieved for a spherical phantom filled with muscle-like tissue, indicating that the sample would not suffer any unsafe deposition of energy. Post mortem abdomen images obtained from a rat presented good image quality and no artifacts related to field non-homogeneity were observed.

scholarly journals Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T

2016 ◽  
Vol 16 (6) ◽  
pp. 294-299 ◽  
Author(s):  
S. Solis-Najera ◽  
F. Vazquez ◽  
R. Hernandez ◽  
O. Marrufo ◽  
A.O. Rodriguez
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Imaging System ◽  
Ex Vivo ◽  
Small Animal ◽  
Magnetic Resonance Imaging System ◽  
External Diameter ◽  
Rf Coil ◽  
Resonance Imaging ◽  
Clinical Magnetic Resonance Imaging

Abstract A surface radio frequency coil was developed for small animal image acquisition in a pre-clinical magnetic resonance imaging system at 7 T. A flexible coil composed of two circular loops was developed to closely cover the object to be imaged. Electromagnetic numerical simulations were performed to evaluate its performance before the coil construction. An analytical expression of the mutual inductance for the two circular loops as a function of the separation between them was derived and used to validate the simulations. The RF coil is composed of two circular loops with a 5 cm external diameter and was tuned to 300 MHz and 50 Ohms matched. The angle between the loops was varied and the Q factor was obtained from the S11 simulations for each angle. B1 homogeneity was also evaluated using the electromagnetic simulations. The coil prototype was designed and built considering the numerical simulation results. To show the feasibility of the coil and its performance, saline-solution phantom images were acquired. A correlation of the simulations and imaging experimental results was conducted showing a concordance of 0.88 for the B1 field. The best coil performance was obtained at the 90° aperture angle. A more realistic phantom was also built using a formaldehyde-fixed rat phantom for ex vivo imaging experiments. All images showed a good image quality revealing clearly defined anatomical details of an ex vivo rat.

Radial magnetic resonance imaging (MRI) using a rotating radiofrequency (RF) coil at 9.4 T

2017 ◽  
Vol 31 (2) ◽  
pp. e3860 ◽  
Author(s):  
Mingyan Li ◽  
Ewald Weber ◽  
Jin Jin ◽  
Thimo Hugger ◽  
Yasvir Tesiram ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Rf Coil ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri

Physiological monitoring of small animals during magnetic resonance imaging

2005 ◽  
Vol 144 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Seyed M. Mirsattari ◽  
Frank Bihari ◽  
L. Stan Leung ◽  
Ravi S. Menon ◽  
Zheng Wang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Physiological Monitoring ◽  
Small Animals ◽  
Resonance Imaging
Sign in / Sign up

Export Citation Format

Share Document