1. A tomography system, comprising: a plurality of lasers of a first group, each laser of the first group for generating light of a distinct wavelength within a first wavelength band; apparatus for simultaneously applying the light from lasers of the first group to mammalian tissue at a plurality of stimulus locations, such that the apparatus is configured to apply light from a first laser of the first group to a first stimulus location but not to a second stimulus location, and configured to apply light from a second laser of the first group to the second stimulus location but not the first stimulus location, the first stimulus location differing from the second stimulus location; a plurality of lasers of a second group, each laser of the second group for generating light of a distinct wavelength within a second wavelength band not overlapping the first wavelength band, the lasers of the second group operable simultaneously with the lasers of the first group; wherein the apparatus for applying light to mammalian tissue is further configured to apply light from a first laser of the second group to the first stimulus location but not to the second stimulus location, and configured to apply light from a second laser of the second group to the second stimulus location but not to the first stimulus location; apparatus for collecting light from the mammalian tissue at a plurality of reception points; apparatus for separating light received from the apparatus for collecting light according to a wavelength of the received light; apparatus for generating path attenuation signals encoding received light amplitude information for each path from a stimulus location to each reception point at each wavelength corresponding to each laser of the plurality of lasers; and image construction apparatus for receiving the path attenuation signals and for reconstructing a tomographic image of the mammalian tissue corresponding to oxygenation of the mammalian tissue.