Measurements of Little et al for Bronchial Wall Dimensions in High Resolution Computed Tomography (HRCT) on a Patient with Asthma

 

Measurements from the HRCT:

(1) outside diameter (OD) of the bronchial wall in mm

(2) inside diameter (ID, luminal diameter) of the bronchial wall in mm

 

thickness of the bronchial wall in mm =

= ((OD) - (ID))/ 2

 

ratio of wall thickness to outside diameter =

= (thickness of wall) / (OD)

 

area occupied by the bronchus =

= PI() * (((OD) / 2)^2)

 

area occupied by the lumen =

= PI() * (((ID) / 2)^2)

 

wall area as percent of total bronchial area as a percent =

= ((area occupied by bronchus) - (area occupied by lumen)) / (area occupied by the bronchus) * 100%

 

These parameters showed a positive correlation with asthma severity an inverse association with the gas transfer coefficient.