To the Investigators knowledge, conventional and ultra-short echo time 1H MRI studies of children with histories of prematurity and BPD have not been performed to quantify microstructural pulmonary abnormalities. The Investigators therefore propose a study to compare pulmonary micro-structural (MRI) and functional (PFT) abnormalities in premature children with and without history of BPD. The investigators hypothesize that pulmonary tissue destruction and/or emphysematous changes will be evident on MRI and will be worse in ex-premature infants with a history of BPD than in those without history of BPD. Further, the investigators hypothesize that MRI will be more sensitive to detect lung changes than PFT, but that MRI changes will correlate with PFT abnormalities. Ultimately, this information will form the basis of future longitudinal studies to evaluate progression of pulmonary disease and assess effects of new treatment strategies in this population.