Quantitative T2 mapping of rats with chronic hepatitis

Area of Science:

• Medical Imaging
• Hepatology
• Experimental Pathology

Background:

• Chronic liver disease diagnosis relies on invasive methods.
• Non-invasive imaging biomarkers are needed for fibrosis staging.
• T2 mapping shows potential for quantitative tissue characterization.

Purpose of the Study:

• To evaluate the diagnostic accuracy of T2 mapping for liver fibrosis.
• To correlate T2 values with histopathological findings in a rat model.
• To establish T2 mapping as a quantitative imaging index for liver fibrosis.

Main Methods:

• Chronic liver disease induced in 88 Sprague-Dawley rats using carbon tetrachloride.
• Control group (n=12) received saline injection.
• T2-weighted/spectral adiabatic inversion recovery and multiple gradient- and spin-echo sequences used for MRI.
• Histopathological analysis (H&E, Masson's trichrome) for fibrosis, necroinflammation, and steatosis staging.

Main Results:

• T2 values significantly correlated with hepatic fibrosis (P<0.05), but not hepatitis or steatosis.
• A strong positive correlation (r=0.820, P<0.05) observed between T2 values and fibrosis stage.
• T2 values demonstrated statistically significant differences across fibrosis stages.
• Area under the curve values for predicting fibrosis stages ranged from 0.942 to 0.958.

Conclusions:

• T2 mapping is a quantitative imaging index that accurately reflects liver fibrosis stages.
• T2 values increase progressively with advancing hepatic fibrosis.
• T2 mapping shows high diagnostic value for staging liver fibrosis in experimental models.