Achieving Electromagnetic Compatibility of WPT Antennas for Medical Imaging in MRI

Ganti, Aasrith; Lin, Jenshan; Wynn, Tracy; Ortiz, Timothy

doi:10.1109/wpt.2018.8639389

2018 IEEE Wireless Power Transfer Conference (WPTC) 2018

DOI: 10.1109/wpt.2018.8639389

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Achieving Electromagnetic Compatibility of WPT Antennas for Medical Imaging in MRI

Aasrith Ganti

Jenshan Lin

Tracy Wynn

et al.

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Maximum Efficiency Tracking of WPT System Based on Frequency Tracking Control

Zheng,

Wang,

Zhu

2024

IEEJ Transactions Elec Engng

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The parameter variations of magnetically coupled resonant wireless power transmission (MCR‐WPT) system cause frequency splitting and resonant frequency shift, which lead to the system detuning and reduce the transmission efficiency. To solve the problems, a frequency tracking control method based on the phase difference between the primary‐side voltage and the secondary‐side current (Frequency Tracking Control‐the primary‐side voltage and the secondary‐side current, FTC‐PS) in this paper. According to the characteristics that the phase difference between the voltage of transmitting side and the current of receiving side is not affected by frequency splitting, the phase difference is controlled at 90°, so that the system can achieve the maximum transmission efficiency under the condition of frequency splitting and resonant frequency shift. The experimental results show that the method can make the system always work at the natural resonant frequency when the parameters change, and the transmission efficiency is not affected by the frequency splitting phenomenon. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Maximum Efficiency Tracking of WPT System Based on Frequency Tracking Control

Zheng,

Wang,

Zhu

2024

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

show abstract

Achieving electromagnetic compatibility of wireless power transfer antennas inside MRI system

et al. 2019

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Radiofrequency surface coils used as receivers in magnetic resonance imaging (MRI) rely on cables for communication and power from the MRI system. Complex surface coil arrays are being designed for improving acquisition speed and signal-to-noise ratio. This, in-turn makes the cables bulky, expensive, and the currents induced on cables by time-varying magnetic fields of the MRI system may cause patient harm. Though wireless power transfer (WPT) can eliminate cables and make surface coils safer, MRI poses a challenging electromagnetic environment for WPT antennas because the antennas made using long conductors interact with the static and dynamic fields of the MRI system. This paper analyses the electromagnetic compatibility of WPT antennas and reveals that commercially available antennas are not compatible with MRI systems, presenting a safety risk for patients. Even when the risk is minimized, the antennas couple with surface coils leading to misdiagnosis. This paper presents an approach to eliminate safety risks and minimize coupling using a filter named “floating filter.” A WPT antenna without a filter has a distortion of 27%, and floating filters reduce the distortion to 2.3%. Secondly, the floating filter does not affect the power transfer efficiency, and the transfer efficiency of 60% is measured with and without filters.

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Achieving Electromagnetic Compatibility of WPT Antennas for Medical Imaging in MRI

Cited by 2 publications

References 3 publications

Maximum Efficiency Tracking of WPT System Based on Frequency Tracking Control

Maximum Efficiency Tracking of WPT System Based on Frequency Tracking Control

Achieving electromagnetic compatibility of wireless power transfer antennas inside MRI system

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