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Performance study of high dielectric constant materials to improve the effectiveness of 7.0 T MRI cerebellar imaging
ZHEN Zhiming  YI Xiaoqi  ZHANG Xiaotong  CHEN Wei  WANG Jian  LIU Chen 

Cite this article as: ZHEN Z M, YI X Q, ZHANG X T, et al. Performance study of high dielectric constant materials to improve the effectiveness of 7.0 T MRI cerebellar imaging[J]. Chin J Magn Reson Imaging, 2024, 15(12): 60-64, 86. DOI:10.12015/issn.1674-8034.2024.12.009.


[Abstract] Objective To evaluate the efficacy of high dielectric constant (HDC) materials in improving the quality of 7.0 T MRI in cerebellar.Materials and Methods Ten subjects were scanned using 7.0 T MRI, and firstly the HDC pad was placed on the occiput of each subject for B1 map, T2WI-turbo spin echo (T2WI-TSE), T1-mprage, and diffusion weighted imaging (DWI) sequence scanning. Then, the HDC pad was removed, and the above sequence scanning protocols were repeated. Comparisons were made between the results of using and not using HDC pad. To assess the quality of brain and cerebellar images of the same individual in two experiments, the Likert 5-point scale method was analyzed subjectively and changes in image signal-to-noise ratio (SNR) was quantified objectively.Results Ten subjects [five males, 27-34 (30.60±2.58) years oid; five females, 26-32 (29.20±2.99) years old] were recruited in the present study. In cerebellar regions, the Likert 5 scores of T2WI-TSE and DWI sequences of the HDC pad group were better than the control group (P<0.05). In the objective assessment, the SNR of images acquired with B1 map and T2WI-TSE sequences were better than the control group (P<0.05). In brain regions, there were no statistical differences in the subjective and objective assessments of B1 map, T2WI-TSE, T1-mprage and DWI sequences (P>0.05).Conclusions Applying the HDC pad in 7.0 T MRI can enhance the imaging quality of cerebellar regions without affecting the original image quality of the brain. It provides new opportunities for ultra-high field cerebellar diagnosis and research, as well as providing optimized strategies for ultra-high field imaging of other anatomical regions.
[Keywords] high dielectric constant；cerebellum；ultrahigh magnetic field strengths；signal-to-noise ratio；dielectric artifact；magnetic resonance imaging；image quality

ZHEN Zhiming1, 2   YI Xiaoqi1, 2   ZHANG Xiaotong3   CHEN Wei4   WANG Jian1, 2   LIU Chen1, 2*  

1 7 T Magnetic Resonance Imaging Translational Medical Center, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing400038, China

2 Department of Radiology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing400038, China

3 College of Electrical Engineering, Zhejiang University, Hangzhou310027, China

4 Siemens Digital Medical Technology (Shanghai) Co., Ltd. Guangzhou Branch, Guangzhou510000, China

Corresponding author: LIU C, E-mail: liuchen@aifmri.com

Conflicts of interest   None.

Received  2023-06-27
Accepted  2023-11-27
DOI: 10.12015/issn.1674-8034.2024.12.009
Cite this article as: ZHEN Z M, YI X Q, ZHANG X T, et al. Performance study of high dielectric constant materials to improve the effectiveness of 7.0 T MRI cerebellar imaging[J]. Chin J Magn Reson Imaging, 2024, 15(12): 60-64, 86. DOI:10.12015/issn.1674-8034.2024.12.009.

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