[Quantification of iron level in the liver by MR imaging in patients treated for transfusion siderosis].

Patients with chronic blood transfusion requirements develop progressive iron overload, which is followed by organ damage in severe cases. Chemical determination of the liver iron concentration in liver biopsies is still regarded as the gold-standard for a precise determination of the degree of iron overload, but cannot be performed just for determination of the liver iron concentration alone due to the possible harmful side effects due to percutaneous liver biopsies. We have therefore validated a non-invasive MRI-technique based on the calculation of the ratio between the signal intensity (SIR) of the liver and skeletal muscle. We found a good correlation between the chemically determined liver iron concentration and the corresponding SIR-values (r2 = 0.98, p < 0.0001) low inter-day variation (2.9 +/- 2.7 mumol Fe/g) indicating that our non-invasive method is applicable for the determination of the liver iron concentration and may also be used for monitoring the efficacy of iron chelation by repeated measurements.