Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Measurements of vortex index (a) and notch index (b). The vortex index is defined as the ratio of vortex length (D) and nasal cavity length (L). The notch index is defined as the ratio of notch depth (h) and nasal cavity length (L). In plot (b), point A indicates the deepest point of the nasal notch. The line BC is the extension line along the tangential direction of the anterior dorsal curve. The notch depth (h) is defined as the perpendicular distance from point A to line BC.
