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In vivo lung morphometry with hyperpolarized (3) He diffusion MRI: reproducibility and the role of

James D Quirk1, Yulin V Chang, Dmitriy A Yablonskiy

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri, USA.

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Summary

Hyperpolarized helium-3 (3He) lung morphometry MRI is a reproducible technique for measuring lung microstructure. This noninvasive method is independent of diffusion gradient direction, supporting its use in clinical studies.

Keywords:
MRIdiffusionheliumhyperpolarized gaslung morphometryreproducibility

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Area of Science:

  • Pulmonary medicine
  • Medical imaging
  • Biophysics

Background:

  • Lung morphometry provides microstructural details traditionally requiring histology.
  • Hyperpolarized gas diffusion MRI offers a noninvasive alternative for assessing lung microstructure.

Purpose of the Study:

  • To establish the reproducibility of hyperpolarized helium-3 (3He) lung morphometry in healthy volunteers.
  • To determine the dependence of these measurements on the diffusion-sensitizing gradient direction.

Main Methods:

  • Utilized hyperpolarized helium-3 (3He) lung morphometry MRI on five healthy subjects.
  • Assessed short-term and long-term reproducibility with duplicate imaging.
  • Evaluated the effect of different diffusion gradient directions on parameter estimates.

Main Results:

  • Demonstrated high reproducibility of (3He) lung morphometry measurements over short and long terms (e.g., %CV of mean chord length = 2.1% and 2.9%).
  • Showed minimal variation across different diffusion gradient directions (%CV = 2.6%).
  • Confirmed independence from field inhomogeneity effects at 1.5T.

Conclusions:

  • Hyperpolarized helium-3 (3He) lung morphometry is a reproducible and reliable technique for measuring acinar microstructure noninvasively.
  • The technique's independence from diffusion gradient direction enhances its utility for comparative studies.
  • This method provides confidence for its application in comparing patient populations and evaluating treatment efficacy.