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Fig. 1B. —Assessment of fractional lung function by quantitative CT versus perfusion scintigraphy. Preoperative forced expiratory volume in 1 sec (FEV₁) in 73-year-old man with chronic dyspnea with recent hemoptysis for 2 months was 1.21 L. FEV₁ after left-sided pneumonectomy was 0.81 L. Loss of FEV₁ was 33%, close to prediction by quantitative CT. Attenuation histogram of quantitative CT integrated from multiple slices encompassing both lungs entirely. Entire lung volume was calculated from area under curve measuring from -1,024 to -200 H. Functional lung volume was fractional volume between -500 and -910 H (two vertical lines). Functional lung volume of left lung was 1,363 mL; functional lung volume of right lung was 2,292 mL. Left/right ratio of functional lung volume was 35% versus 65%. Quantitative CT—predicted forced expiratory volume in 1 sec (FEV₁₎ loss was 35%. R = right lung, L = left lung, R + L = combination.

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