Table 2. Unilateral volume of the human nasal cavity (nostrils to choana) in three patients with nasal airway obstruction (NAO) after mucosal decongestion with Oxmetazoline.
| Unilateral Volume (ml) | ||||
|---|---|---|---|---|
| Patient | Cavity | -800HU | -550HU | -300HU |
| 1 | Left | 12.6 | 14.2 (12.5%) | 15.6 (23.6%) |
| 2 | 12.4 | 15.4 (24.2%) | 17.6 (41.6%) | |
| 3 | 11.0 | 13.5 (22.7%) | 15.5 (41.0%) | |
| 1 | Right | 13.8 | 15.4 (11.7%) | 16.8 (22.0%) |
| 2 | 13.8 | 16.8 (21.3%) | 19.0 (37.4%) | |
| 3 | 11.9 | 14.6 (22.2%) | 16.7 (40.0%) | |
| Average volume (ml) | 12.6 ± 1.1 | 15.0 ± 1.1 | 16.9 ± 1.3 | |
| Average volume increase (%) | 19.1% ± 5.5% | 34.3% ± 9.0% | ||
Nasal cavity volume is strongly dependent on the threshold used for segmentation of the airspace from CT scans (-800 HU, -550 HU, or -300 HU). Numbers in parenthesis represent the percentage increase compared to models created with a threshold of -800HU.