Fig. 3.

An example of end-tidal ${\mathrm{pCO}}_2$, ${\mathrm{pO}}_2$, and breast ${\mathrm{StO}}_2$ of a normal subject during (a) unregulated inhalation of medical air and (b) regulated inhalation of gas with a step change in values at 4 and 10 min. Breast ${\mathrm{StO}}_2$ is determined from image data acquired by our dynamic near-infrared spectral (NIRS) tomography system.