Wireless, Battery-free, and Fully Implantable Micro-Coil System for 7 T Brain MRI
- Authors
- Ullah, Sana; Zada, Muhammad; Basir, Abdul; Yoo, Hyoungsuk
- Issue Date
- Jun-2022
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- 7 T; Biomedical imaging; Blood vessel; Blood vessels; Coils; Magnetic resonance imaging; RF microcoil; Signal to noise ratio; Transmitting antennas; Wireless communication; wireless magnetic resonance imaging; wireless power transfer
- Citation
- IEEE Transactions on Biomedical Circuits and Systems, v.16, no.3, pp.430 - 441
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE Transactions on Biomedical Circuits and Systems
- Volume
- 16
- Number
- 3
- Start Page
- 430
- End Page
- 441
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190539
- DOI
- 10.1109/TBCAS.2022.3179839
- ISSN
- 1932-4545
- Abstract
- An elegant solution for the concurrent transmission of data and power is essential for implantable wireless magnetic resonance imaging (MRI). This paper presents a self-tuned open interior microcoil (MC) antenna with three useful operating bands of 300 (7 T), 400, and 920 MHz, for blood vessel imaging, data telemetry, and efficient wireless transmission of power, respectively. The proposed open interior MC antenna contains two mirrorlike arms with diameters and lengths of 2.4 mm and 9.8 mm, respectively, to avoid blood flow blockage. To wirelessly show LED glow on a saline based phantom, the MC was fabricated on a flexible polyimide material and combined with a miniaturized rectifier and a micro-LED. Using a path gain, the power transfer efficiency (PTE) of the MC rotation was also analyzed. Additionally, the PTE was calculated for a range of distances between 25 and 60 mm, and a -27.1 dB PTE attained at a distance of of 30 mm. Based on the recommendations of the International Commission on Non-Ionizing Radiation Protection for human brain safety when exposed to radio-frequencies from external transmitter, a specific absorption rate analysis was analyzed. Measurements of the s-parameters were noted using a saline solution and blood vessel model to imitate a realistic human head. They were found to correlate reasonably with the simulated results.
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