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Reproducibility of 129Xe CSSR‐derived alveolar septal thickness and surface‐area‐to‐volume ratio values in COPD patients and age‐matched healthy volunteers. (a) and (b): ST and S/V values in healthy volunteers (mean age = 59 ± 8 years). (c) and (d): ST and S/V values in COPD patients (mean age = 67 ± 6 years). Solid lines represent the mean CV and dashed lines denote ± 2 standard deviations from the mean.
