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Junction lines between left and right lungs in axial CT images. (a) Image showing a thin tissue layer separating the left and right lung in anterior (A) and posterior (B) junction lines. (b) Example of a 2D lung separation approach that operates on 2D slices and results in segmentation inconsistencies at the anterior junction (C), as depicted in axial (left) and coronal (right) CT image cross-sections.
