Spatially resolved measurements of hyperpolarized gas properties in the lung in vivo. Part I: diffusion coefficient.

Published

Journal Article

In imaging of hyperpolarized noble gases, a knowledge of the diffusion coefficient (D) is important both as a contrast mechanism and in the design of pulse sequences. We have made diffusion coefficient maps of both hyperpolarized (3)He and (129)Xe in guinea pig lungs. Along the length of the trachea, (3)He D values were on average 2.4 cm(2)/sec, closely reproducing calculated values for free gas (2.05 cm(2)/sec). The (3)He D values measured perpendicular to the length of the trachea were approximately a factor of two less, indicating restriction to diffusion. Further evidence of restricted diffusion was seen in the distal pulmonary airspaces as the average (3)He D was 0.16 cm(2)/sec. An additional cause for the smaller (3)He D in the lung was due to the presence of air, which is composed of heavier and larger gases. The (129)Xe results show similar trends, with the trachea D averaging 0.068 cm(2)/sec and the lung D averaging 0.021 cm(2)/sec. Magn Reson Med 42:721-728, 1999.

Full Text

Duke Authors

Cited Authors

  • Chen, XJ; Möller, HE; Chawla, MS; Cofer, GP; Driehuys, B; Hedlund, LW; Johnson, GA

Published Date

  • October 1999

Published In

Volume / Issue

  • 42 / 4

Start / End Page

  • 721 - 728

PubMed ID

  • 10502761

Pubmed Central ID

  • 10502761

International Standard Serial Number (ISSN)

  • 0740-3194

Language

  • eng

Conference Location

  • United States