This archive contains the following files:

   readme.txt      This file
   headtrip.anim7  AGA animation created from actual MRI data
   announcement    Information about MRI data (3dhead) included for legal 
                   reasons

   This animation was created from 109 slices of MRI (Magnetic Resonance 
Imaging) data. For those unfamiliar with MRI, it creates a 2-D cross
section of an organ of interest by exploiting properties of magnetic
fields (which I don't fully understand). The neat thing about MRI is that
you can obtain a cross section at any depth (normally many slices are
obtained through the organ). The slices can then be processed to obtain
3-D images and other neat stuff. I got involved with this in my DSP
(Digital Signals Processing) class at Johns Hopkins. The class project was
to apply DSP to medical imaging. My involvement was the 2-D slices to 3-D
image generation.

   I obtained the MRI data from the University of North Carolina through
the internet (omicron.cs.unc.edu 152.2.128.159). For those interested, the
data can be found in the /pub/softlab/CHVRTD/volI directory. Be warned, the
data is about 14 megs. My first challenge was to covert the 12-bit gray
scale data to 8-bit gray scale. I did this with a Arexx program that I
wrote. After that I converted it to a portable gray map (rawtopgm) and then
to gif format (ppmtogif). Programs rawtopgm and ppmtogif are unix ports and
can be found on the Aminet. After that it was a simple matter to throw the
slice together via Art Dept Pro.


                        Brian Dziki


   I can be reached at the Wishbringer BBS 1-401-956-2911 or 1-401-269-6607
(mail Mr. Zeke) or I can be reached via Internet (bjdziki@clark.net).