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The ET (nasal and oral) airways are the first route and serve as a filter for the inhaled particles.
The ET airways are the important determinant of doses delivered by inhaled particles to the lung.
Since the structure of the ET airway geometry exhibit significant intersubject variations, it affects both extrathoracic deposition and in further consequence, the fraction of inhaled particles reaching the lung.
The current study is focused on the effect of inter-subject variability of ET airways on particle deposition.