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• Technical Article •
Design and verification of flexible and elastic coil for the head of wearable MRI device
ZHANG Shuang  LI Guihao  WU Lin 

Cite this article as: Zhang S, Li GH, Wu L. Design and verification of flexible and elastic coil for the head of wearable MRI device[J]. Chin J Magn Reson Imaging, 2022, 13(2): 62-68. DOI:10.12015/issn.1674-8034.2022.02.013.


[Abstract] Objective To reduce the influence of the matching degree between the scanning site and the coil size on signal-to-noise ratio (SNR) in high field magnetic resonance imaging due to the difference of patients' body geometry.Materials and Methods To achieve better matching of scanning position and coil, one adult head was selected as the research object, and the flexible coil for the head was made by filling the surface of the coil with common-side regular hexagon. To verify the performance of the self-made coil and the commercial coil, comparative experiments were carried out with water film and true human head respectively.Results The water film experiment proved that with the increase of imaging depth, the SNR of the self-made coil showed a decline trend. The maximum SNR was of the surface layer which was 3 times that of the deep layer; compared with the commercial 8-channel head coil, from the tissue surface to the deep layer (46 mm) of the water film, the SNR of the self-made coil increased by 0-2 times. Compared with the SNR at the 46 mm depth, the SNR at a deeper point was reduced by about 15%. Scanning the coronal surface structure of the human head showed that the SNR value of the coronal surface structure of the human head had the largest SNR value at the surface position and the smallest SNR value at the center. From the surface layer to the deep layer, the SNR of the image gradually decreased. At the same time, due to incomplete coil laying, the imaging results would be worsened to a certain extent. The tests showed that the self-made coil was feasible and stable.Conclusions It fully proves that the combination of flexible material and elastic material can adapt to the geometric deformation caused by the adult's head change, so as to obtain the maximum filling coefficient inside the coil. At the same time, the imaging quality worsening caused by the incomplete laying of the coil also exists, which cannot be compensated by a high filling coefficient, so in the clinical application it cannot be ignored.
[Keywords] wearable；common-side regular hexagon；head coil；flexibility；magnetic resonance imaging

ZHANG Shuang1, 2, 3*   LI Guihao2, 3, 4   WU Lin2, 3  

1 School of Artificial Intelligence, Neijiang Normal University, Neijiang 641112, China

2 School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731, China

3 High Field Magnetic Resonance Brain Imaging Laboratory of Sichuan, University of Electronic Science and Technology of China, Chengdu 611731, China

4 Radiotherapy Center, the First Affiliated Hospital of Xinxiang Medical University, Xinxiang 453100, China

Zhang S, E-mail: zhangshuanghua1@126.com

Conflicts of interest   None.

ACKNOWLEDGMENTS National Natural Science Foundation of China (U19A2082); Sichuan Science and Technology Program (2019YJ0181, 22MZGC0086); China Postdoctoral Science Foundation (2020M683294); Sichuan Applied Psychology Research Center of Chengdu Medical College Funded Projects (CSXL-21103); Innovative Team of Neijiang Normal University Program (17TD03, 2021TD02).
Received  2021-09-01
Accepted  2022-01-24
DOI: 10.12015/issn.1674-8034.2022.02.013
Cite this article as: Zhang S, Li GH, Wu L. Design and verification of flexible and elastic coil for the head of wearable MRI device[J]. Chin J Magn Reson Imaging, 2022, 13(2): 62-68. DOI:10.12015/issn.1674-8034.2022.02.013.

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