Circularly polarized RF coil for energy harvesting in clinical MRI

Abstract Radiofrequency (RF) harvesting is a promising technology for the wireless power supply of various in-bore devices used in magnetic resonance imaging. However, current technical solutions in this area are based on the conversion of linearly polarized RF fields, and thus their efficiency is limited, as they interact only with a fraction of circularly polarized RF fields. In the present work, we introduce and experimentally realize a novel harvesting setup allowing for converting circularly polarized RF fields to direct current.

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Beam collimation scheme of laser wireless power supply system for high potential monitoring node of power transmission and transformation

Journal of Physics Conference Series ◽

10.1088/1742-6596/1885/4/042031 ◽

2021 ◽

Vol 1885 (4) ◽

pp. 042031

Author(s):

Huang Feng ◽

Huang Hui ◽

Deng Hui ◽

Tianyi Yang ◽

Xiangyu Zhang

Keyword(s):

Power Supply ◽

Power Supply System ◽

Power Transmission ◽

Supply System ◽

High Potential ◽

Wireless Power ◽

Wireless Power Supply ◽

Beam Collimation ◽

Potential Monitoring

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An 8-Channel RF Coil based on Microstrip Yagi-antenna for 7T Magnetic Resonance Imaging

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting ◽

10.1109/ieeeconf35879.2020.9330174 ◽

2020 ◽

Author(s):

Ke He ◽

Mengxia Yu ◽

E Zhao ◽

Guiping Li ◽

Maoyan Wang ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Rf Coil ◽

Resonance Imaging ◽

Yagi Antenna

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

Measurement Science Review ◽

10.1515/msr-2016-0037 ◽

2016 ◽

Vol 16 (6) ◽

pp. 294-299 ◽

Cited By ~ 1

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.

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