Figure 3.

A, Sagittal multiplanar volume reformatted image of the right lung from quantitative CT scan imaging using lung density analysis program demonstrating heterogeneous, bullous emphysema, with the emphysematous portions of the lung shaded red. The integrity of the major fissure is demonstrated (arrows). B, Quantitative data for use in the evaluation of the suitability of the patient for bronchoscopic lung volume reduction. In this example, the LDI, or proportion of the lung with < –950 HU, is higher in the upper lung (upper LDI) than in the lower lung (lower LDI), which is a favorable finding when considering suitability for bronchoscopic lung volume reduction. HU = Hounsfield units; LDI = low-density index.