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Fig. 1C. —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. Perfusion scintigram (posterior image) of left/right lung shows functional distribution was 48% versus 52%. Predicted FEV₁ loss was 48%.

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