In vivo lung morphometry with accelerated hyperpolarized 3He diffusion MRI: A preliminary study. Issue 4 (5th May 2014)

• Record Type: Journal Article
• Authors: Chang, Yulin V.; Quirk, James D.; Yablonskiy, Dmitriy A.
• Is Part Of: Magnetic resonance in medicine. Volume 73:Issue 4(2015:Apr.)
• Page Start: 1609
• Page End: 1614
• Publication Date: 2014-05-05
• Subjects: lung morphometry -- hyperpolarized gas MRI -- parallel imaging -- generalized autocalibrating partially parallel acquisitions -- g‐factor; Nuclear magnetic resonance -- Periodicals; Electron paramagnetic resonance -- Periodicals; 616.07548
• DOI: 10.1002/mrm.25284
• Languages: English
• ISSNs: 0740-3194

Abstract

Abstract : Purpose: Parallel imaging can be used to reduce imaging time and to increase the spatial coverage in hyperpolarized gas magnetic resonance imaging of the lung. In this proof‐of‐concept study, we investigate the effects of parallel imaging on the morphometric measurement of lung microstructure using diffusion magnetic resonance imaging with hyperpolarized 3 He. Methods: Fully sampled and under‐sampled multi‐ b diffusion data were acquired from human subjects using an 8‐channel 3 He receive coil. A parallel imaging reconstruction technique (generalized autocalibrating partially parallel acquisitions [GRAPPA]) was used to reconstruct under‐sampled k‐space data. The morphometric results of the generalized autocalibrating partially parallel acquisitions‐reconstructed data were compared with the results of fully sampled data for three types of subjects: healthy volunteers, mild, and moderate chronic obstructive pulmonary disease patients. Results: Morphometric measurements varied only slightly at mild acceleration factors. The results were largely well preserved compared to fully sampled data for different lung conditions. Conclusion: Parallel imaging, given sufficient signal‐to‐noise ratio, provides a reliable means to accelerate hyperpolarized‐gas magnetic resonance imaging with no significant difference in the measurement of lung morphometry from the fully sampled images. GRAPPA is a promising technique to significantly reduce imaging time and/or to improve the spatial coverage for the morphometric measurement with hyperpolarized gases.Magn Reson Med 73:1609–1614, 2015. © 2014 Wiley Periodicals, Inc.