Fig. 5From: Thermodiluted relative tidal volume estimation using a thermal camera in operating room under spinal anesthesiaModel concept: this picture illustrates the approach of the proposed model. For the case of inspiration, cold room air acts as the injectate and warm lung air acts as the environment. For the case of expiration, warm lung air acts as the injectate and cold room air acts as the environment. The thermal energy of the injectate and environment are exchanged in the nasal cavityBack to article page