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.
Methods used to calculate the airway tree to lung percentage ratio using CT. The airway tree and each lobe were segmented, and the volumes of tree portions in the right upper, middle, and lower lobes (RUL, RML, and RLL) and the left upper and lower lobes (LUL and LLL) were measured together with the lung volumes of the RUL, RML, RLL, LUL, and LLL. The airway tree to lung volume percentage ratio (AWV%) for each region was then calculated
