TABLE 1.

Formulas used to predict postoperative lung function in the study patient population.

Method	Lung function variable	Formula used to predict postoperative lung function
Ventilation map	Lobar ventilation	$\mathit{\text{Preoperative}}{\mathit{\text{lung function}}}^{*}\times \left(1-\frac{\mathit{\text{lobar ventilation of lobes to}}\mathit{be}\mathit{\text{removed}}}{\mathit{\text{ventilation of}}{\mathit{\text{whole lung}}}^{**}}\right)$
Perfusion map	Lobar perfusion	$\mathit{\text{Preoperative}}{\mathit{\text{lung function}}}^{*}\times \left(1-\frac{\mathit{\text{lobar perfusion of lobes to}}\mathit{be}\mathit{\text{removed}}}{\mathit{\text{perfusion of}}{\mathit{\text{whole lung}}}^{***}}\right)$
Volume analysis	Functional volume	$\mathit{\text{Preoperative}}{\mathit{\text{lung function}}}^{*}\times \left(1-\frac{\mathit{\text{functional volume of lobes to}}\mathit{be}\mathit{\text{removed}}}{\mathit{\text{functional volume of whole lung}}}\right)$
Perfusion scan	Radioactivity	$\mathit{\text{Preoperative}}{\mathit{\text{lung function}}}^{*}\times \left(1-\frac{\mathit{\text{radioactivity of lobes to}}\mathit{be}\mathit{\text{removed}}}{\mathit{\text{radioactivity of whole lung}}}\right)$
Segment counting	The number of segments	$\mathit{\text{Preoperative}}{\mathit{\text{lung function}}}^{*}\times \left(1-\frac{\mathit{\text{the number of segments to}}\mathit{be}\mathit{\text{removed}}}{\mathit{\text{the number of segments of whole lung}}}\right)$

Note: *PFT results (FVC, FEV₁, FEV₁/FVC, DLco).

Note: **The sum of lobar ventilation values for each individual lobe.

Note: ***The sum of lobar perfusion values for each individual lobe.

Abbreviations: DLco, diffusing capacity of the lung for carbon monoxide; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; PFT, pulmonary function test.