Evaluation With Scans and Pharyngometry of the Possible Changes in Upper Airway Geometry Induced by Using Different Mouthpieces.

11 MRI scans per subject will be taken, one for each mouthpiece design of an inhaler.

Pharyngometry will be carried out in supine and upright position. 11 different mouthpieces will be evaluated in both positions.

One low dose CT scan of the upper airway will be taken. The scan will be taken at normal inhalation through a mouthpiece with moderate resistance.

One CBCT scan of the upper airway will be taken. The scan will be taken at normal respiration through a mouthpiece with moderate resistance.

Dental impressions will be taken. These will be optically scanned before registration in the 3D imaging modalities.