gopher://gopher.austin.unimelb.edu.au:70/11/images
This database provides access to representative PET-scan images for various human medical conditions. The images are stored in a JPEG format so you will need a JPEG viewing program to see them. There are two parts to each scan - a description of the patient aetiology and of the scan, and the JPEG file of the images themselves. The two have the same name, but differ in the extension (.txt /.jpg).