Dräger PulmoVista 500 Manual page 50

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FrC = functional residual capacity:
FRC is a physiological parameter that describes the residual volume of lung
capacity at the end of passive expiration (against ambient pressure). EELV (or
FRC) describes the volume of air that can contribute to gas exchange between
breaths.
negative impedance change:
Negative impedance changes are displayed in black or purple. They represent
inverted waveforms and are often caused by fluid accumulations inside the
thorax.
rOI = region of Interest:
Arrangement of regions for quantitative analysis of EIT images.
Tidal image:
The Tidal Image represents the tidal volume distribution of one entire breath
from the end of expiration to the end of inspiration.
Tv = Tidal variation:
Increase in impedance during inspiration, correlates to the tidal volume VT.
TV global represents the tidal variation between the minimum value and the
maximum value in the global impedance curve for each breath. Regardless of
the tidal volume, this value is always 100 %, it merely serves as a reference for
the tidal variations of the ROI.
Tv rOI:
Regional tidal variations indicate the percentage of the ventilation-related
impedance change that occur in the corresponding ROI.