Laboratory tests were performed using blood samples collected within 1 week before or after the MRI examination. All 90 patients underwent serum ferritin, fasting blood glucose (FBG), and fasting insulin tests. According to the American Diabetes Association criteria (26), patients were classified with normal glucose function if they had FBG <5.6 mmol/L; impaired fasting glucose (IFG) if FBG was between 5.6–6.9 mmol/L, and DM if FBG >7.0 mmol/L. The homeostasis model assessment (HOMA) indexes were also calculated according to the following formulae: HOMA-β (beta cell function) (normal range: 130–400%) = insulin ×20/glucose-3.5 and HOMA-IR (insulin resistance) (normal range: 0.8–1.6) =insulin × glucose/22.5 (2).

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