3D hyperpolarized He-3 MRI of ventilation using a multi-echo projection acquisition

James H. Holmes, Rafael L. O'Halloran, Ethan K. Brodsky, Youngkyoo Jung, Walter F. Block, Sean B. Fain

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

A method is presented for high-resolution 3D imaging of the whole lung using inhaled hyperpolarized (HP) He-3 MR with multiple half-echo radial trajectories that can accelerate imaging through undersampling. A multiple half-echo radial trajectory can be used to reduce the level of artifact for under-sampled 3D projection reconstruction (PR) imaging by increasing the amount of data acquired per unit time for HP He-3 lung imaging. The point spread functions (PSFs) for breath-held He-3 MRI using multiple half-echo trajectories were evaluated using simulations to predict the effects of T2* and gas diffusion on image quality. Results from PSF simulations were consistent with imaging results in volunteer studies showing improved image quality with increasing number of echoes using up to 8 half-echoes. The 8-half-echo acquisition is shown to accommodate lost breath-holds as short as 6 sec using a retrospective reconstruction at reduced resolution and also to allow reduced breath-hold time compared with an equivalent Cartesian trajectory. Furthermore, preliminary results from a 3D dynamic inhalation-exhalation maneuver are demonstrated using the 8-half-echo trajectory. Results demonstrate the first high-resolution 3D PR imaging of ventilation and respiratory dynamics in humans using HP He-3 MR.

Original languageEnglish (US)
Pages (from-to)1062-1071
Number of pages10
JournalMagnetic Resonance in Medicine
Volume59
Issue number5
DOIs
StatePublished - May 1 2008
Externally publishedYes

Keywords

  • Hyperpolarized helium-3
  • Lung
  • Multi-echo
  • Radial projection acquisition
  • Ventilation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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    Holmes, J. H., O'Halloran, R. L., Brodsky, E. K., Jung, Y., Block, W. F., & Fain, S. B. (2008). 3D hyperpolarized He-3 MRI of ventilation using a multi-echo projection acquisition. Magnetic Resonance in Medicine, 59(5), 1062-1071. https://doi.org/10.1002/mrm.21437