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Paul J.C. Hughes, Marta Tibiletti, Matthew J. Heaton, Ho-Fung Chan Guilhem J. Collier, Matthew Austin, Laurie J. Smith, Jim Lithgow, Jo Naish, Jim M. Wild, Geoff J.M. Parker

ISMRM Conference 2020

Abstract

Introduction: Hyperpolarized xenon-129 (¹²⁹Xe) is able to assess both structure and function of the lungs. Oxygen enhanced MRI (OE-MRI) is a low-cost and easier to implement proton MRI acquisition method that may provide alternative functional metrics to ¹²⁹Xe. We studied the repeatability of ¹²⁹Xe and OE-MRI parameters in a population of adult healthy volunteers, and evaluated the degree of correlation between the resulting metrics.

Discussion: All ¹²⁹Xe metrics had bias close to zero, as assessed by Bland-Altman analysis, with the sub-voxel measures of ADC, LmD and RBC:TP being the most repeatable. Furthermore, all ¹²⁹Xe metrics had narrow limits of agreement suggesting these metrics to be suitable for longitudinal assessment of patients. OE-VVF was the most repeatable OE-MRI metric, with the remaining three having reasonable repeatability, strongly influenced by one subject (HV03) who showed large variability between visits. The existence of a correlation between ΔPO₂ and ¹²⁹Xe ventilation heterogeneity measures in healthy volunteers requires further investigation. 

Conclusions: ¹²⁹Xe and OE MRI metrics are reproducible and it is feasible to acquire images using both methods in volunteers.
 

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