Figure 2

The relative error of the procedure performed by the Engstrom Carestation. This is expressed as (EELV_GE – EELV_{CT SCAN})/EELV_{CT SCAN} as a function of the ratio between tidal volume and the end expiratory lung volume (EELV) measured by computed tomography (CT) scan ((EELV_GE – EELV_{CT SCAN})/EELV_{CT SCAN} = 0.05 + 0.43 × (Tidal Volume/EELV_{CT SCAN}, r² = 0.58, p < 0.0001).