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. Author manuscript; available in PMC: 2010 Sep 22.
Published in final edited form as: Magn Reson Med. 2007 Sep;58(3):636–642. doi: 10.1002/mrm.21285

Table 1.

Number of Airways in Each Airway Generation of the Airway Tree Cast

Airway generation
0 1 2 3 4 5 6 7 8 9 10
Number of airways in this generation 1 2 4 7 15 20 14 10 6 4 2
Number of airways amenable to CT analysis 1 2 4 7 14 12 4
Number of airways amenable to MRI analysis 1 2a 3 3 4 0 0
a

Due to bending, one first-generation airway was processed as two separate segments.