Figure 1.

Carbon fiber sheet–resistive heater embedded in a 3D-printed, flat-base multimodal imaging cradle. Proportional–integral–derivative (PID) controller (A); bottom view of the cradle (B); top view of the cradle (C); and thermal image of the cradle surface (D). The cradle contains a heater and (*) a mouthpiece assembly consisting of a base block, a vertical and horizontal adjustable mouth bar, and an anesthetic gas delivery tube, (¦) is a pressure balloon for respiration monitoring, (#) is an optical fiber for temperature monitoring, and (†) is a cover sheet to contain anesthetic gas. The current wires and metal couplings to the carbon-fiber are located beyond the imaging field of view (FOV) so do not present image distortions.