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Bland-Altman plots of percent ventilated volume (%VV; A) and heterogeneity score (Hscore; B) generated from images acquired with hyperpolarized 3He at all acquisition volumes. Black dots indicate bias, gray dots are the 95% confidence intervals and the black dashed line is 0. RV, residual volume; RV + 1L, residual volume plus 1 liter of gas mixture; FRC, functional residual capacity; FRC + 1L, functional residual capacity volume plus 1 liter of gas mixture; TLC, total lung capacity.
