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To test the four hypotheses (H1 to H4), different features were extracted from the EIT images and potential outliers with high noise or unstable heart and lung ROIs were removed. Then, the ability to estimate SV with these features via a linear model was evaluated by means of Bland-Altman analysis (absolute SVEIT in H1 and H2) or four-quadrant plot analysis (relative ΔSVEIT in H3 and H4).
