I recently saw some discussion on povray.text.scene-files (I think!) about
rendering a brain
and someone mentioned the CT and MR scan data at
http://graphics.stanford.edu/data/voldata/.
I got the data and converted them to df3 files (around 7MB each!) and
rendered them as an
emitting medium.  The results are quite pretty (and squashed, I got the
scaling wrong!)
This is the CT scan, the MR scan has much more detail and will require more
careful choice
of colourmap to get a clean image.
The 'mouthful of toothpicks' effect is the result of shadowing from the
subjects fillings since this
is an X-Ray image.

Andy

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