Huang J, Leporq B, Hervieu V, Dumortier J, Beuf O, Ratiney H. Diffusion-Weighted MRI of the Liver in Patients With Chronic Liver Disease: A Comparative Study Between Different Fitting Approaches and Diffusion Models.
J Magn Reson Imaging 2024;
59:894-906. [PMID:
37243428 DOI:
10.1002/jmri.28826]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 05/12/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023] Open
Abstract
BACKGROUND
Diffusion-weighted imaging (DWI) has been considered for chronic liver disease (CLD) characterization. Grading of liver fibrosis is important for disease management.
PURPOSE
To investigate the relationship between DWI's parameters and CLD-related features (particularly regarding fibrosis assessment).
STUDY TYPE
Retrospective.
SUBJECTS
Eighty-five patients with CLD (age: 47.9 ± 15.5, 42.4% females).
FIELD STRENGTH/SEQUENCE
3-T, spin echo-echo planar imaging (SE-EPI) with 12 b-values (0-800 s/mm2 ).
ASSESSMENT
Several models statistical models, stretched exponential model, and intravoxel incoherent motion were simulated. The corresponding parameters (Ds , σ, DDC, α, f, D, D*) were estimated on simulation and in vivo data using the nonlinear least squares (NLS), segmented NLS, and Bayesian methods. The fitting accuracy was analyzed on simulated Rician noised DWI. In vivo, the parameters were averaged from five central slices entire liver to compare correlations with histological features (inflammation, fibrosis, and steatosis). Then, the differences between mild (F0-F2) or severe (F3-F6) groups were compared respecting to statistics and classification. A total of 75.3% of patients used to build various classifiers (stratified split strategy and 10-folders cross-validation) and the remaining for testing.
STATISTICAL TESTS
Mean squared error, mean average percentage error, spearman correlation, Mann-Whitney U-test, receiver operating characteristic (ROC) curve, area under ROC curve (AUC), sensitivity, specificity, accuracy, precision. A P-value <0.05 was considered statistically significant.
RESULTS
In simulation, the Bayesian method provided the most accurate parameters. In vivo, the highest negative significant correlation (Ds , steatosis: r = -0.46, D*, fibrosis: r = -0.24) and significant differences (Ds , σ, D*, f) were observed for Bayesian fitted parameters. Fibrosis classification was performed with an AUC of 0.92 (0.91 sensitivity and 0.70 specificity) with the aforementioned diffusion parameters based on the decision tree method.
DATA CONCLUSION
These results indicate that Bayesian fitted parameters may provide a noninvasive evaluation of fibrosis with decision tree.
EVIDENCE LEVEL
1 TECHNICAL EFFICACY: Stage 1.
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