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Hepatic iron overload: diagnosis and quantification with MR imaging
O Ernst1, G Sergent, P Bonvarlet
1Department of Radiology, Centre Hospitalier Universitaire de Lille, France.
AJR. American Journal of Roentgenology
|May 1, 1997
Summary
Magnetic Resonance (MR) imaging effectively diagnoses liver hemochromatosis and quantifies hepatic iron concentration (HIC). T2*-weighted MR sequences demonstrate high sensitivity and specificity for detecting iron overload.
Area of Science:
- Radiology
- Medical Imaging
- Hepatology
Background:
- Liver hemochromatosis is a condition of excess iron storage.
- Accurate quantification of hepatic iron concentration (HIC) is crucial for diagnosis and management.
- Non-invasive methods for assessing HIC are highly desirable.
Purpose of the Study:
- To evaluate the diagnostic sensitivity of MR imaging for liver hemochromatosis.
- To assess the capability of MR imaging in quantifying HIC.
- To compare MR imaging findings with biopsy-confirmed HIC values.
Main Methods:
- Prospective MR imaging in 58 patients with suspected hemochromatosis.
- Utilized a 0.5-T magnet with gradient-echo T1-weighted and T2*-weighted sequences.
- Compared liver-to-muscle signal-intensity ratios with biopsy-measured HIC.
Main Results:
- Both MR sequences showed strong correlation between decreased signal-intensity ratios and increased HIC.
- T2*-weighted sequences achieved 91% sensitivity and 88% specificity for iron overload detection.
- MR imaging demonstrated significant correlation with biopsy HIC, particularly for values < 300 mumol/g.
Conclusions:
- MR imaging is a promising tool for differentiating normal from elevated HIC.
- MR imaging can effectively provide gross quantification of moderate hepatic iron overload.
- Non-invasive MR assessment of HIC shows potential for clinical application.