Inclusion Criteria:  Patients hospitalized at the Department of Pediatrics of the Medical University of Vienna who will get a CT scan of the thorax. Patients aged up to 12 months  Exclusion Criteria:  Unstable cardiovascular, respiratory and/or neurological conditions. Sternotomy during the previous 15 days. Thoracic skin lesions or wounds (including burns) on the thorax, where the EIT-electrode-belt would be placed.