Wasn't it [GDS|Entropy] who wrote:
>Hello,
>
>I recall that many years ago, back when isosurfaces were part of the
>"isosurface patch", there was a demo image using MRI data I think...
>
>Does anyone remember how to do that, or have that file?
>
>I just had an MRI last night, and I think it would be cool to render my
>brain.

I don't know how that would have worked with the patch, but the official 
isosurface code added the ability to use any pattern in an isosurface 
function, so if you can obtain the raw data and convert it to a DF3 file 
you can write things like

#declare F=function{ pattern{
      density_file df3 "brain.df3"
      interpolate 1 }
}
isosurface {function { 0.05 - F(x,y,z) }

-- 
Mike Williams
Gentleman of Leisure

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