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Fig. 2. —Shaded surface display image of bronchial tree illustrates scoring system used to compare results of acquisition and postprocessing techniques. 0 = not visualized; 1 = visualized up to right or left main bronchus; 2 = upper lobe, medial lobe, or lower lobe; 3 = lingula or segmental bronchus; 4 = fourth-generation bronchi; and 5 = fifth-generation bronchi.