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Clinical Article
The reproducibility of liver stiffness from magnetic resonance elastography under confounding factors in patients with chronic liver disease
PAN Zhongxian  WEN Wucheng  MENG Fanqi  HAO Liantao  LI Zhujing  YUAN Jing  YANG Xiaoyan  LÜ Hanqing  HU Yuanming  CHEN Yueyao 

Cite this article as: Pan ZX, Wen WC, Meng FQ, et al. The reproducibility of liver stiffness from magnetic resonance elastography under confounding factors in patients with chronic liver disease[J]. Chin J Magn Reson Imaging, 2022, 13(7): 35-41. DOI:10.12015/issn.1674-8034.2022.07.007.

[Abstract] Objective To investigate the reproducibility and stability of liver stiffness (LS) from magnetic resonance elastography (MRE) in the background of chronic liver disease (CLD).Materials and Methods From April 2019 to June 2020, sixty patient cases with CLD had liver MRE twice on the same day at our hospital were enrolled, and LS was measured by two observers. The multi-echo Dixon sequence was applied to detect R2* and proton density fat fraction (PDFF) to assess whether a patient had hepatic iron overload or steatosis. High BMI was defined as a BMI of higher than 25 kg/m2. Patients were divided into groups based on whether or not they had hepatic iron overload, steatosis, or a high BMI. The intraclass correlation coefficient (ICC) and the Bland-Altman method were used to analyze the intra-observer, inter-observer, and short-term re-examination reproducibility and stability of LS in each group.Results The intra-observer, inter-observer and short-term re-examination ICCs for LS values were: 0.987, 0.981 and 0.982 for the hepatic iron overload group; 0.994, 0.990 and 0.987 for the steatosis group; and 0.958, 0.948 and 0.926 for the high BMI group. The Bland-Altman plots show that most of the LS differences between intra-observer, inter-observer, and short-term re-examinations were within the 95% limits of agreement, and the mean values (upper, lower) of the differences were: hepatic iron overload group 0.02 (-0.10, 0.13), 0.00 (-0.14, 0.15), 0.04 (-0.09, 0.16); steatosis group 0.01 (-0.09, 0.11), 0.00 (-0.13, 0.13), 0.04 (-0.10, 0.17); high BMI group 0.00 (-0.10, 0.11), -0.01 (-0.13, 0.11), 0.03 (-0.09, 0.16). After excluding potential confounding factors, the intra-observer, inter-observer and short-term re-examination ICCs for LS values were: 0.978, 0.984 and 0.918 for the hepatic iron overload group; 0.996, 0.996 and 0.990 for the steatosis group; and 0.907, 0.968 and 0.957 for the high BMI group.Conclusions MRE measures of liver stiffness in CLD patients with hepatic iron overload, steatosis, or a high BMI are highly reproducible and stable.
[Keywords] chronic liver disease;iron overload;steatosis;magnetic resonance elastography;reproducibility

PAN Zhongxian   WEN Wucheng   MENG Fanqi   HAO Liantao   LI Zhujing   YUAN Jing   YANG Xiaoyan   LÜ Hanqing   HU Yuanming   CHEN Yueyao*  

Department of Radiology, Shenzhen Traditional Chinese Medicine Hospital, the Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen 518033, China

Chen YY, E-mail:

Conflicts of interest   None.

ACKNOWLEDGMENTS National Natural Science Foundation of China (No. 81903960); National Natural Science Foundation of Guangdong Province (No. 2020A1515010732).
Received  2022-03-22
Accepted  2022-06-27
DOI: 10.12015/issn.1674-8034.2022.07.007
Cite this article as: Pan ZX, Wen WC, Meng FQ, et al. The reproducibility of liver stiffness from magnetic resonance elastography under confounding factors in patients with chronic liver disease[J]. Chin J Magn Reson Imaging, 2022, 13(7): 35-41. DOI:10.12015/issn.1674-8034.2022.07.007.

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