Assessment of liver iron overload by T2-Quantitative magnetic resonance imaging: Correlation of T2-QMRI measurements with serum ferritin concentration and histologic grading of siderosis
| Autor: | Christos Kattamis, Lambros Vlahos, Thomas G. Maris, Athanassios Gouliamos, Olympia Papakonstantinou, Voula Kostaridou, George B. Papavassiliou, Constantinos G. Papavassiliou, Gregoris K. Koutoulas, George Kordas, Angelos Kalovidouris |
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| Rok vydání: | 1995 |
| Předmět: |
Adult
Pathology medicine.medical_specialty Liver Iron Concentration Hemosiderosis Biopsy Biomedical Engineering Biophysics Nuclear magnetic resonance medicine Humans Radiology Nuclear Medicine and imaging Hepatitis medicine.diagnostic_test biology business.industry beta-Thalassemia Transfusion Reaction Magnetic resonance imaging medicine.disease Hepatitis C Magnetic Resonance Imaging Ferritin Liver Case-Control Studies Ferritins Multivariate Analysis Linear Models biology.protein Siderosis business Quantitative analysis (chemistry) |
| Zdroj: | Magnetic Resonance Imaging. 13:967-977 |
| ISSN: | 0730-725X |
| DOI: | 10.1016/0730-725x(95)00041-e |
| Popis: | Purpose: To correlate hepatic 1 T2 values obtained by means of a T2-Quantitative MRI (T2-QMRI) technique with three widely applied methods for the evaluation of hemosiderosis, i.e., (a) liver iron concentration (LFeC) (b) serum ferritin (SF), and (c) histologic grading of siderosis. The impact of coexisting hepatitis was also considered. T2-QMRI measurements were compared with signal intensity (SI) ratio measurements on conventional SE images. Materials and methods: Liver T2 relaxation times were calculated in 40 thalassemic patients, on an 0.5 T magnetic resonance imaging system using a multiple spin-echo sequence with parameters: TR = 2500 ms, TE = 12 ms in 20 symmetrically repeatable echoes. Results: (a) 1 T2 values were well correlated (r = 0.97) with liver iron concentration, which ranged from 2.32 to 18.0 mg/g dry weight (normal 1 T2 values were also correlated with serum ferritin levels (r = 0.84). At various 1 T2 values, serum ferritin levels were higher for the anti-HCV(+) patients than the anti-HCV(−) ones. (c) T2 values corresponding to successive grades of siderosis presented statistically significant differences. (d) SI ratio measurements assigned less statistically significant results, as compared to T2 values. Conclusion: T2-QMRI measurement of T2 relaxation time is more accurate than SI ratios in evaluating liver iron overload. It is particularly useful for hemosiderotic patients with coexisting hepatitis since, in this case, serum ferritin is not considered a reliable index of hemosiderosis. |
| Databáze: | OpenAIRE |
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