Evaluation of liver fibrosis with a monoexponential model of intravoxel incoherent motion magnetic resonance imaging
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Cuiyun Chen1, Fangfang Fu1, Jing Zhang2, Fangfang Guo3, Meiyun Wang1, Shaocheng Zhu1, Dapeng Shi1 and Yuwei Tian2
1Department of Radiology, Zhengzhou University People’s Hospital, Zhengzhou, Henan 450003, China
2Department of Hepatobiliary Surgery, Zhengzhou University People’s Hospital, Zhengzhou, Henan 450003, China
3Department of Pathology, Zhengzhou University People’s Hospital, Zhengzhou, Henan 450003, China
Yuwei Tian, email: email@example.com
Keywords: liver fibrosis; IVIM-DWI; magnetic resonance imaging; monoexponential model
Received: May 19, 2017 Accepted: February 21, 2018 Published: May 15, 2018
To evaluate hepatic fibrosis with a monoexponential model of intravoxel incoherent motion magnetic resonance imaging, and assess the potential application value of intravoxel incoherent motion (IVIM) in diffusion-weighted imaging (IVIM-DWI) in determining staging of liver fibrosis. 28 patients with hepatic fibrosis and 25 volunteers with healthy livers had IVIM examination and conventional MRI. All standard apparent diffusion coefficient (ADC) values of IVIM raw data were post-processed off-line after completion of data collection. All regions of interest (ROIs) were manually positioned by two experienced radiologists. All values of the different fibrosis stages in the study group were compared using independent sample t tests. Using ROC analysis, both AUC values of ADCtotal and ADC0-400-600-800 from study and control group were found to be between 0.8 and 1 for staging fibrosis. The mean ADCtotal and ADC0-400-600-800 values of the liver in the study group were significantly lower than the values in the control group (P < 0.05). Spearman rho correlation analysis was used to determine the relationship among fibrosis stages and the ADCtotal and ADC0-400-600-800 in the study group. As the stage of the fibrosis increased, the values decreased. Significant differences between the two subgroups of liver fibrosis stages were found (P < 0.05). The monoexponential model of IVIM-DWI adopted multiple b values for quantitative analysis of the water molecules diffused in the tissue. It could be used as a noninvasive and valuable method for assessment of liver fibrosis.
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