Respiratory Disease  Inclusion Criteria:  Physician-diagnosed lung disease - based on a diagnosis made by a treating staff physician and confirmed by the principal investigator. Age 0-99 years. Informed consent by participant, parent, or legal guardian In the opinion of the Investigator, the participant will likely be able to perform maneuvers to obtain technically acceptable pulmonary XeMRI images.  Exclusion Criteria:  Physical findings at screening that, in the opinion of the Investigator, would compromise the safety of the participant or the quality of the research data. Requirement of supplementary oxygen to maintain an oxygen saturation above 95%. Failed MRI screening form. History of claustrophobia. Known current pregnancy or lactation.  Healthy  Inclusion Criteria:  Age 0-99 years Informed consent by participant, parent, or legal guardian In the opinion of the Investigator, the participant will likely be able to perform maneuvers to obtain technically acceptable pulmonary MRI images.  Exclusion Criteria  Physician-diagnosed lung disease. Failed MRI screening form. History of claustrophobia. Physical findings at screening that, in the opinion of the Investigator, would compromise the safety of the participant or the quality of the research data. Known current pregnancy or lactation.