Fig. 2

Example of transverse and coronal slice CT airway measurements. The patient’s computed tomography scan of the chest is reviewed prior to the procedure to re-confirm proper airway sizes and geometry. The right mainstem bronchial length must be ≥10 mm to ensure an adequate location for electrode placement. The diameters measured on the transverse scan and coronal scan (diameter indicated by white dotted lines on CT images) must be averaged to determine the appropriate catheter size for both mainstem bronchi