Figure 6-1 High-resolution computed tomography scans from one dog: control (upper left), during 0.5% halothane (upper right), during 1.0% halothane (lower left), and during 1.5% halothane (lower right). Notice the progressive dilation of the airways as indicated by the arrow. (Adapted from Brown RH, Mitzner W, Zerhouni E, et al: Direct in vivo visualization of bronchodilation induced by inhalational anesthesia using high-resolution computed tomography. Anesthesiology 78:295, 1993.)