Dynamic MRI of Grid-Tagged Hyperpolarized Helium-3 for the Assessment of Lung Motion During Breathing

Jing Cai, Ke Sheng, Stanley H Benedict, Paul W. Read, James M. Larner, John P. Mugler, Eduard E. de Lange, Gordon D. Cates, G. Wilson Miller

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Purpose: To develop a dynamic magnetic resonance imaging (MRI) tagging technique using hyperpolarized helium-3 (HP He-3) to track lung motion. Methods and Materials: An accelerated non-Cartesian k-space trajectory was used to gain acquisition speed, at the cost of introducing image artifacts, providing a viable strategy for obtaining whole-lung coverage with adequate temporal resolution. Multiple-slice two-dimensional dynamic images of the lung were obtained in three healthy subjects after inhaling He-3 gas polarized to 35%-40%. Displacement, strain, and ventilation maps were computed from the observed motion of the grid peaks. Results: Both temporal and spatial variations of pulmonary mechanics were observed in normal subjects, including shear motion between different lobes of the same lung. Conclusion: These initial results suggest that dynamic imaging of grid-tagged hyperpolarized magnetization may potentially be a powerful tool for observing and quantifying pulmonary biomechanics on a regional basis and for assessing, validating, and improving lung deformable image registration algorithms.

Original languageEnglish (US)
Pages (from-to)276-284
Number of pages9
JournalInternational Journal of Radiation Oncology Biology Physics
Volume75
Issue number1
DOIs
StatePublished - Sep 1 2009
Externally publishedYes

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Keywords

  • Deformable image registration
  • Dynamic MRI
  • Hyperpolarized gas
  • Lung motion

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation
  • Cancer Research

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