Figure 6-17 Diagram of a midsagittal section of the thorax while awake (solid lines) and while anesthetized (red lines) with a 1.2 minimum alveolar concentration (MAC) of halothane. Chest wall configuration was determined using images of the thorax obtained by three-dimensional fast computed tomography. (Adapted from Warner DO, Warner MA, Ritman EL: Atelectasis and chest wall shape during halothane anesthesia. Anesthesiology 85:49, 1996.)