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An illustration of branch addition (case 24). a Fused system view in the vicinity of a missing airway. b, c Close-up views in the vicinity of the missing branch, both with (b) and without (c) the airway tree segmentation. The arrow in (b) highlights the airway missed by automatic 3D airway tree definition and Tf. d Branch Addition adds a small child airway bj ∉ B (red) to Tf
