In clinical practice we can visualize the shape nasal cavity of patients by CT, but we cannot fully evaluate their nasal function physiologically. In future computational fluid dynamics will be necessary to analyze the physiology of nose. Now, the helical CT Scan makes it possible to visualize the morphological change in human body from various viewpoints. The following images are made by the helical CT Scan. Untreated image is ordinary one, and treated image is one after treatment of epinephrine spray.
Untreated view is assumed as a nasal cavity at rest.
Oxygen demand is low, and respiratory flow is slow. In coronal view, the nasal cavity is divided by turbinates and the depth of flow is short. The shape of turbinate is gradientlly changed from anterior to posterior. These structure decrease Reynold share stress. Heat and vapor exchange work effectively.