CFTR and cystic fibrosis: Hyperpolarized 129Xenon gas MRI (Xe‐MRI) provides regional pulmonary ventilation defect percent (VDP) measures and has been shown to detect early CF lung disease,6 capture response to antibiotic treatment for a pulmonary exacerbation,7 and track improvements in ventilation following therapy with the triple combination of CFTR modulators: elexacaftor, tezacaftor, and ivacaftor (ETI).8