European Journal of Radiology Open | 2021
Quantitative T2* imaging of iron overload in a non-dedicated center – Normal variation, repeatability and reader variation
Abstract
Background Patients with transfusion dependent anemia are at risk of complications from iron overload. Quantitative T2* magnetic resonance imaging (MRI) is the best non-invasive method to assess iron deposition in the liver and heart and to guide chelation therapy. Purpose To investigate the image quality and inter-observer variations in T2* measurements of the myocardium and the liver, and to obtain the lower limit of cardiac and hepatic quantitative T2* values in patients without suspicion of iron overload. Material and methods Thirty-eight patients referred for cardiac MRI were prospectively included in the study. Three patients were referred with, and 35 without suspicion of iron overload. Quantitative T2* parametric maps were obtained on a 1.5\u202fT MRI system in the cardiac short axis and liver axial view. Two readers independently assessed the image quality and the representative and the lowest T2* value in the myocardium and the liver. Results The normal range of representative T2* values in the myocardium and liver was 24−45\u202fms and 14−37\u202fms, respectively. None of the 35 participants (0 %, 95 % confidence interval 0–11 %) in the normal reference group demonstrated representative T2* values below previously reported lower limits in the myocardium (20\u202fms) or the liver (8\u202fms). Focal myocardial areas with T2* values near the lower normal range, 19−20\u202fms, were seen in two patients. The readers generally reported good image quality. Conclusion T2* imaging for assessing iron overload can be performed in a non-dedicated center with sufficient image quality.