EIT minute images before and after start of mechanical ventilation using a high belt position. Two representative EIT images of a single patient: the blue silhouette shows the intra-thoracic gas content. The magnitude of impedance changes is color coded and ranges from dark blue, which indicates low changes to high white, which indicates high impedance changes. Panel A: prior to intubation (“Pre-Intubation”) the maximum impedance change occurs in the middle of the thorax. Panel B: after intubation and start of mechanical ventilation (“Intubation”) impedance changes are highest in ventral lung regions.