Table 4. Performance of different image reconstruction algorithms during mechanical ventilation with constant tidal volume and variable end-expiratory pressure and O₂ fraction.

Expected finding
V is independent of Peep
V  =  V	0.224	0.268	0.512	0.838	0.024*	0.008*	0.000*	0.225	0.247	0.815	0.018*	0.044*
V  =  V	0.022*	0.027*	0.090	0.247	0.008*	0.014*	0.000*	0.026*	0.030*	0.245	0.010*	0.013*
V is independent of FI o 2
V  =  V	0.010*	0.009*	0.000*	0.010*	0.033*	0.025*	0.000*	0.009*	0.035*	0.030*	0.010*	0.004*
V  =  V	0.002*	0.002*	0.010*	0.005*	0.001*	0.001*	0.000*	0.002*	0.001*	0.042*	0.002*	0.001*
V is reproducible
V  =  V	0.003*	0.003*	0.001*	0.012*	0.002*	0.001*	0.000*	0.002*	0.003*	0.007*	0.001*	0.001*
V  =  V	0.000*	0.000*	0.001*	0.002*	0.001*	0.001*	0.000*	0.000*	0.001*	0.002*	0.001*	0.000*
CoV is Peep dependent
CoV CoV	0.088	0.088	0.136	0.114	0.060	0.037*	0.121	0.085	0.075	0.083	0.043*	0.064
CoV CoV	0.034*	0.033*	0.044*	0.052	0.026*	0.017*	0.053	0.033*	0.035*	0.022*	0.019*	0.023*
CoV is FI o 2 dependent
CoV CoV	0.012*	0.012*	0.020*	0.020*	0.010*	0.010*	0.035*	0.011*	0.016*	0.009*	0.011*	0.010*
CoV CoV	0.659	0.679	0.689	0.713	0.586	0.639	0.751	0.662	0.664	0.735	0.604	0.683
CoV is reproducible
CoV  =  CoV	0.059	0.064	0.238	0.013*	0.061	0.023*	0.009*	0.065	0.107	0.026*	0.032*	0.007*
CoV  =  CoV	0.009*	0.009*	0.010*	0.000*	0.028*	0.016*	0.001*	0.010*	0.042*	0.006*	0.017*	0.002*

The expected physiological findings regarding the magnitude and distribution of ventilation are used as reference states. -values of the Student's -test are reported. For each test, (the number of animals).

E, Measures by EIT; V, tidal volume; Peep (P), positive end-expiratory pressure; ZEEP (Z), zero end-expiratory pressure; F_I o ₂, fraction of O in inspired gas; 21, F_I o ₂ equal to 21%; 100, F_I o ₂ equal to 100%; indices 1 and 2 identify the first and the second measurements at identical ZEEP or Peep levels; CoV, center of ventilation; hypothesis confirmed at .