Fig. 2
Association and agreement between CT-based DRRS and the different EIT-based methods evaluated in non-dependent and dependent lung regions. A Association between DRRS by CT and DRRS by ΔZAU/EELIAU. B Association between DRRS by CT and DRRS by ΔZml/EELIml. C Association between DRRS by CT and DRRS by ΔZAU (For A–C individual values and linear regression curves with 95% confidence bands for both regions analyzed are shown). D Agreement between CT-based DRRS and the different EIT-based methods. For this analysis, the differences between the individual value of CT-based DRRS and the respective EIT-based DRRS values are shown with mean and standard deviation for each EIT method. E Illustration of changes in EELI induced by PEEP using different references for EIT reconstruction (PEEP 5 cmH2O and PEEP 7 cmH2O). Note that modifying the reference results in arbitrary DRRS values (both in absolute levels and the differences between the PEEP steps), with an increase in reference EELI values which leads to lower DRRS