Relationship between hepatic iron concentration and the SIR of liver to muscle with T1-weighted images derived from GE pulse sequences for patients with SIR greater than 0.2 for patients with no fibrosis (A) or with fibrosis (B). For comparison, the relationship between hepatic iron concentration and the serum ferritin concentration is shown for the same groups of patients without fibrosis (C) and with fibrosis (D).