Buy a stencil box for $12.00
at a craft store. This is a very small box, with a small light placed behind the white cover. If you do this, you will only be able to photograph one view at the time.
SCANNER METHOD
For this you will need a halogen desk lamp. Place your MRI on your scanner. Leave your scanner lid opened. With the halogen desk lamp, follow the scanner light as it moves across the surface. Your light and the the scanner light will be moving together.