Fig 1.
The figure includes the central axis lines and the main airway names (down to the segmental level). The axial slice of the airway RMI is included on the left to demonstrate its non-circular cross-section.
Table 1.
Patient demographic and lung function parameters (mean±std).
Table 2.
The hydraulic diameter per generation per lobe at MLV and TLC.
Fig 2.
The hydraulic diameter MLV vs TLC.
(a) The proximal airways, with T shown as blue circles ●, R as red triangles ▲, L as green diamonds ◆ and RMI as purple crosses +. (b) The lobar roots except RL, with RU shown as blue circles ●, RM as red triangles ▲, LU as green diamonds ◆ and LL as purple crosses +, (c) RU lobe generation 3, (d) RU lobe generation 4 and (e) RU lobe generation 5, with RB1 bronchi shown as blue circles ●, RB2 as red triangles ▲ and RB3 as green diamonds ◆. Airway naming terminology is explained in the Bronchial Geometry Acquisition section. The identity line (continuous line,––) and the combined data regression line (interrupted line,––) are also shown.
Fig 3.
The hydraulic diameter versus average inner diameter.
(a) The proximal airways, with T shown as blue circles ●, R as red triangles ▲, L as green diamonds ◆ and RMI as purple crosses +. (b) The lobar roots except RL, with RU shown as blue circles ●, RM as red triangles ▲, LU as green diamonds ◆ and LL as purple crosses +, (c) RU lobe generation 3, (d) RU lobe generation 4 and (e) RU lobe generation 5, with RB1 bronchi shown as blue circles ●, RB2 as red triangles ▲ and RB3 as green diamonds ◆. Airway naming terminology is explained in the Bronchial Geometry Acquisition section. The identity line (continuous line,––) and the combined data regression line (interrupted line,––) are also shown.
Table 3.
The measured lumen area (Ai) and inner perimeter (Pi) for specific airways at mean lung volume (MLV) and total lung capacity (TLC).
Fig 4.
The influence of the change in lung volume between MLV and TLC on the lumen area.
Data are shown for generations 3 and 4 for the right upper lobe (a and b), right lower lobe (c and d) and left lower lobe (e and f). (a, b) RB1 blue circle ●, RB2 red triangle ▲, RB3 green diamond ◆. (c, d) RB8 blue circle ●, RB9 red triangle ▲, RB10 green diamond ◆. (e, f) LB8 blue circle ●, LB9 red triangle ▲, LB10 green diamond ◆. The plotted regression lines are the following: RB1, RB8 and LB8 continuous line (blue––). RB2, RB9 and LB9 interrupted line (red––). RB3, RB10 and LB10 dotted line (green….). The identity line (diagonal black continuous line, black––) is also shown.
Table 4.
The distensibility and Pearson correlation coefficient between lung volume change and lumen area change, given per airway and generation.
Fig 5.
The average distensibility of individual region generation 3 and generation 4 airways.
Right lung bronchial regions are plotted as blue circles ● while left lung regions are plotted as red triangles ▲. The outlier LB1 is represented as a green diamond ◆. The identity line (continuous line,––) and the combined data regression line (interrupted line,––) are also shown.