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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: Acad Radiol. 2008 Jun;15(6):693–701. doi: 10.1016/j.acra.2007.10.009

Figure 3.

Figure 3

Relationship between the diffusion time and the RMS distance that 3He atoms in air diffuse in an unrestricted environment. The approximate dimensions of several structures in the human lung are indicated for comparison.