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Mean perfusion within specified (ml/min/mil) for normal subjects and patients with ARDS (B). A significantly greater proportion of blood flow was directed toward denser voxels (p<0.05). Proportion of total perfusion delivered to specified water fraction in normal subjects (C) and patients with ARDS (D). The total proportion of perfusion directed to voxels with water fraction of greater than 0.7 was 0.3% in normal subjects and 37% in patients with ARDS (p<0.05).
