A) Micro-computed tomography data corresponding to a helium-3 magnetic resonance imaging voxel size of 7×7×7 mm and b) the segmented single acinus volume.

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a) Micro-computed tomography data corresponding to a helium-3 magnetic resonance imaging voxel size of 7×7×7 mm and b) the segmented single acinus volume. c) A cross-section of segmented airspace mask and d) a three-dimensional helium-3 diffusivity distribu... a) Micro-computed tomography data corresponding to a helium-3 magnetic resonance imaging voxel size of 7×7×7 mm and b) the segmented single acinus volume. c) A cross-section of segmented airspace mask and d) a three-dimensional helium-3 diffusivity distribution map obtained from the computer simulation. Reproduced from [32] with permission from the authors. Ioannis Vogiatzis et al. ERJ Open Res 2015;1:00002-2015 ©2015 by European Respiratory Society