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Hyperpolarised helium-3 magnetic resonance lung imaging in a healthy normal volunteer (A) and in patients with mild (FEV1 of 132% of predicted value, B), moderate (FEV1 of 83% of predicted value, C), and severe (FEV1 of 34% of predicted value, D) asthma. Reproduced from Samee et al. [31] with permission of Elsevier. FEV1, forced expiratory volume in 1 second.
