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. 2016 Nov 17;122(1):191–197. doi: 10.1152/japplphysiol.00584.2016

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Fig. 1. — Lateral gamma camera image of nasal ^81mKr gas inhalation overlaid on the coronal MRI image of a volunteer during breath holding. A: definition of anterior (Nasal1), posterior (Nasal2), pharyngeal, tracheal, and lung ROIs. B: visualization of ^81mKr gas distribution 500 ms after the application of NHF at a rate of 45 l/min (right) compared with the control (left) shows fast clearance of the tracer gas in the upper airways. The control measurement without cannula flow shows stable ^81mKr gas concentration.