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• TECHNICAL ARTICLE •
Application of a dedicated surface coil in thyroid MRI provides superior image quality
YANG Qian  ZOU Liyan  LIU Zhou  DENG Wenming  ZHANG Miaoru  SONG Xiaomin  LI Tianran  WANG Yunfei  LUO Dehong 

Cite this article as: Yang Q, Zou LY, Liu Z, et al. Application of a dedicated surface coil in thyroid MRI provides superior image quality[J]. Chin J Magn Reson Imaging, 2021, 12(2): 57-61. DOI:10.12015/issn.1674-8034.2021.02.013.


[Abstract] Objective To evaluate the quality of thyroid gland magnetic resonance images acquired using a surface coil exclusively designed for thyroid gland. Materials andMethods In this prospective study, forty-nine volunteers underwent MR examination using the surface coil exclusively designed for thyroid gland under a thyroid MR protocol including T1WI, T2WI, T2WI-FS (fat-suturation), DWI-STIR (diffusion weighted imaging-STIR) and DWI-FOCUS. For the qualitative evaluation, double-blinded evaluation was performed by two experienced radiologists on the image quality according to the Likert Scale scoring criteria, and then the consistency of the scoring results was analyzed. As for quantitative evaluation, the consistency in signal intensity, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) measured between each lobe of the thyroid gland on the MR images with different sequences was analyzed.Results Based on the subjective scoring criteria, all of the T1WI, T2WI, T2WI-FS images were rated no less than 4 points, while all of DWI-STIR and DWI-FOCUS images were rated no less than 3 points by two radiologists. Two radiologists agreed perfectly in the ratings of T1WI, T2WI, T2WI-FS, DWI-STIR and DWI-FOCUS sequences with consistency of 0.92, 0.94, 0.96, 0.93 and 0.89, respectively. For the objective evaluation in consistencies between two lobes of thyroid gland for the T1WI, T2WI, T2WI-FS, DWI-STIR and DWI-FOCUS sequences, consistency of 0.957, 0.937, 0.924, 0.871 and 0.848 for the mean signal intensities, 0.945, 0.957, 0.885, 0.825 and 0.773 for the signal-to-noise ratio, 0.577, 0.704, 0.740, 0.710 and 0.589 for the contrast-to-noise ration were obtained with mean signal intensities of 1246.39, 1345.03, 860.88, 236.91 and 569.06, SNRs of 17.56, 33.18, 42.82, 27.99 and 19.53, CNRs of 0.20, 5.36, 3.07, 16.01 and 9.91, respectively for each sequence.Conclusions The thyroid MR images acquired using the exclusively designed surface coil have high subjective rating scores, homogeneous signal intensity, high consistency in signal intensity, signal-to-noise ratios and contrast-to-noise ratio, which suggests that they could meet the requirement for clinical diagnosis.
[Keywords] thyroid；magnetic resonance imaging；image quality evaluation；surface coil；signal-to-noise ratio

YANG Qian1   ZOU Liyan1   LIU Zhou1   DENG Wenming1   ZHANG Miaoru1   SONG Xiaomin1   LI Tianran1   WANG Yunfei1   LUO Dehong1, 2*  

1 Department of Radiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen 518116, China

2 Department of Radiology, National Cancer Center/National Clinical Research Center for Cancer, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China

Luo DH, E-mail: cjr.luodehong@vip.163.com

Conflicts of interest   None.

ACKNOWLEDGMENTS This work was part of Cancer Hospital, Chinese Academy of Medical Sciences, Shenzhen Center/ShenZhen Cancer Hospital Research Project (No. SZ2020ZD005).
Received  2020-09-14
Accepted  2021-01-13
DOI: 10.12015/issn.1674-8034.2021.02.013
Cite this article as: Yang Q, Zou LY, Liu Z, et al. Application of a dedicated surface coil in thyroid MRI provides superior image quality[J]. Chin J Magn Reson Imaging, 2021, 12(2): 57-61. DOI:10.12015/issn.1674-8034.2021.02.013.

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