19F MRI to Evaluate Regional Ventilation in Healthy Subjects and Subjects With Cystic Fibrosis

"* Composition: inhaled PFP, a gaseous contrast agent (79% PFP, 21% O2, pre-mixed, medical grade gas)~* Administration: Full-face disposable ventilation mask and a standard Douglas Bag system.~* Dosage: Two controlled breaths of contrast gas followed by a full breath and a 12-second breath-hold and scan for image acquisition.~* Frequency: Repeated 5 times followed by an identical five cycles with room air to ensure PFP gas wash-out has occurred."