Related Experiment Video
Updated: May 11, 2026
Measurement of Tumor T2* Relaxation Times after Iron Oxide Nanoparticle Administration
Published on: May 19, 2023
Liver iron quantification by 3 tesla MRI: calibration on a rabbit model
Peng Peng1, Zhongkui Huang, Liling Long
1Department of Radiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China.
Purpose:
To determine the feasibility of liver iron quantification by 3 Tesla (T) MRI using a novel iron overload rabbit model.
Materials And Methods:
Forty-two rabbits underwent iron dextran loading from 1 to 15 weeks. MRI signal intensity ratio (SIR) was measured using a gradient-echo sequence, and R2(1/T2) measured using an eight-echo spin-echo sequence at 3T. Ex vivo hepatic pathology was obtained for all rabbits studied. Postmortem assessments of liver iron concentration (LIC) were conducted in an atomic absorption spectrophotometer. MRI measures were fitted against LIC using linear regression for 30 of the iron-loaded rabbits. The remaining 12 iron-loaded rabbits were used to test the prediction accuracy of the derived models.
Results:
LIC was linearly correlated to both liver-to-muscle SIR (r = -0.845) and R2 (r = 0.965) in a range achieved in this study (LIC < 10 mg/g dry tissue) at 3T. By regression, the linear equations were determined as: Y1 = 10.581-5.924X1 (Y1 : LIC, X1 :SIR); Y2 = -1.273+0.103X2 (Y2 :LIC, X2 :R2). In the 12 test rabbits, the predicted LICs using the derived equations agreed well with the results obtained using the spectrophotometer.
Conclusion:
Both SIR and R2 are highly correlated with LIC in a novel rabbit model. MRI quantification of liver iron overload is feasible at 3T.
Insights
Magnetic Resonance Imaging (MRI) can accurately quantify liver iron overload at 3 Tesla using signal intensity ratio and R2 measurements in a novel rabbit model. This method is feasible for assessing iron levels in the liver.
Area of Science:
- Biomedical Imaging
- Magnetic Resonance Imaging
- Medical Diagnostics
Background:
- Liver iron overload is a condition requiring accurate quantification for effective management.
- Traditional methods for liver iron concentration (LIC) assessment can be invasive or limited.
- Developing non-invasive imaging techniques for LIC is crucial.
Purpose of the Study:
- To assess the feasibility of quantifying liver iron overload using 3 Tesla (3T) MRI.
- To validate MRI-based iron quantification against ex vivo measurements in a rabbit model.
Main Methods:
- A novel rabbit model with induced iron overload was developed over 15 weeks.
- MRI measurements included signal intensity ratio (SIR) and R2 (1/T2) at 3T.
- Ex vivo liver pathology and atomic absorption spectrophotometry were used for gold-standard LIC assessment.
Main Results:
- A strong linear correlation was found between LIC and both SIR (r = -0.845) and R2 (r = 0.965) at 3T.
- Regression models were established to predict LIC from MRI parameters.
- Predicted LIC values closely matched spectrophotometer results in test rabbits.
Conclusions:
- Both SIR and R2 measurements at 3T MRI show high correlation with liver iron concentration.
- MRI-based quantification of liver iron overload is feasible and accurate in this rabbit model.
- This technique holds promise for non-invasive assessment of iron overload.
