Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Impact of Liver Fibrosis and Fatty Liver on T1rho Measurements: A Prospective Study

  • Xie, Shuangshuang (Department of Radiology, Tianjin First Center Hospital) ;
  • Li, Qing (Department of Radiology, Tianjin First Center Hospital) ;
  • Cheng, Yue (Department of Radiology, Tianjin First Center Hospital) ;
  • Zhang, Yu (Clinical Science, Philips Healthcare) ;
  • Zhuo, Zhizheng (Clinical Science, Philips Healthcare) ;
  • Zhao, Guiming (Department of Hepatology, Tianjin Second People's Hospital) ;
  • Shen, Wen (Department of Radiology, Tianjin First Center Hospital)
  • Received : 2016.12.04
  • Accepted : 2017.04.15
  • Published : 2017.12.01
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Abstract

Objective: To investigate the liver T1rho values for detecting fibrosis, and the potential impact of fatty liver on T1rho measurements. Materials and Methods: This study included 18 healthy subjects, 18 patients with fatty liver, and 18 patients with liver fibrosis, who underwent T1rho MRI and mDIXON collections. Liver T1rho, proton density fat fraction (PDFF) and $T2^*$ values were measured and compared among the three groups. Receiver operating characteristic (ROC) curve analysis was performed to evaluate the T1rho values for detecting liver fibrosis. Liver T1rho values were correlated with PDFF, $T2^*$ values and clinical data. Results: Liver T1rho and PDFF values were significantly different (p < 0.001), whereas the $T2^*$ (p = 0.766) values were similar, among the three groups. Mean liver T1rho values in the fibrotic group ($52.6{\pm}6.8ms$) were significantly higher than those of healthy subjects ($44.9{\pm}2.8ms$, p < 0.001) and fatty liver group ($45.0{\pm}3.5ms$, p < 0.001). Mean liver T1rho values were similar between healthy subjects and fatty liver group (p = 0.999). PDFF values in the fatty liver group ($16.07{\pm}10.59%$) were significantly higher than those of healthy subjects ($1.43{\pm}1.36%$, p < 0.001) and fibrosis group ($1.07{\pm}1.06%$, p < 0.001). PDFF values were similar in healthy subjects and fibrosis group (p = 0.984). Mean T1rho values performed well to detect fibrosis at a threshold of 49.5 ms (area under the ROC curve, 0.855), had a moderate correlation with liver stiffness (r = 0.671, p = 0.012), and no correlation with PDFF, $T2^*$ values, subject age, or body mass index (p > 0.05). Conclusion: T1rho MRI is useful for noninvasive detection of liver fibrosis, and may not be affected with the presence of fatty liver.

Keywords

Acknowledgement

Supported by : National Natural Science Fund of China, Science and Technology Fund of Tianjin, Tianjin Clinical Research Center

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