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Fig. 3B. —Lower pulmonary lobe in 31-year-old man with pulmonary nodules. Curved multiplanar reformatted ECG-gated CT images (A and C) with segmental separations (white lines) and corresponding subtraction images (B and D, respectively) of lower pulmonary lobe emphasize difference between pulmonary structures during cardiac R-R intervals with minimal and maximal shift. In both lower lobes, structural shift is most significant in segments 6 and 8 situated alongside major pulmonary fissures, whereas additional significant shift is detected in left segment 10, which is located directly adjacent to thoracic aorta. Black lines delineate pulmonary fissures.