The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

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.