Table 1.

X-ray Velocimetry terminology and metrics.

X-ray Velocimetry terminology and metrics
ΔV/V0	Specific Ventilation	Inspiration (ΔV) divided by end-expiratory volume (V0) in the same region. A within-lung dimensionless value
MSV	Mean Specific Ventilation	The mean specific ventilation throughout the whole lung
VDP	Ventilation Defect Percentage	The proportion of the lung with specific ventilation less than 60% of the MSV for that animal
nVDP	Normalised Ventilation Defect Percentage	The proportion of the lung with specific ventilation less than 60% of the MSV of the control population
VH	Ventilation Heterogeneity	Interquartile range divided by the mean specific ventilation. Quantifies the spread of specific ventilation