I agree, PCD's have been available for some time, but this is the first time a 3D reconstruction of a living human has been produced. The image colors do actually represent the energy spectrum of the transmitted photons. However, if we wish to see this information then we must map the X-ray color to the visible spectrum or there would nothing to visualize. In this case using a tissue color scheme that we understand is just convenient.
This tech also does work quite nicely on complex anatomy.
This tech also does work quite nicely on complex anatomy.