Hmm...
Well apparently my data is in DICOM format.
I used a program called MRIco found here: http://www.sph.sc.edu/comd/rorden/ 
to convert it to Analyze format.
Apparently I will need to use the TGA to DF3 converter in p.b.u to convert 
TGAs to DF3....as there are no other converters that I can locate.

I did find info and code to patch POV to support HDF as isosurface, found 
here: http://www.linuxjournal.com/article/7486

fwiw,
ian

"Mike Williams" <nos### [at] econymdemoncouk> wrote in message 
news:NNq### [at] econymdemoncouk...
> 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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