This figure shows Electrical Impedance Tomography data for a 10-day old spontaneously breathing neonate lying in the prone position with the head turned to the left. On the left is a functional EIT image and on the right the impedance change against time for six consecutive breaths. Data were published in S. Heinrich, H. Schiffmann, A. Frerichs, A. Klockgether-Radke, I. Frerichs, Body and head position effects on regional lung ventilation in infants: an electrical impedance tomography study. Intensive Care Med., 32:1392-1398, 2006.