WebMD
Medicine Net: Computerized Axial Tomography
This site from MedicineNet.com gives a CAT Scan description, why they're performed, risks, and patient preparation. A thoughrough explanation of the process is provided.
University of Colorado
University of Colorado: Physics 2000: Cat Scans
A CAT Scan is compared to cutting up a fruitcake on this basic, yet interesting site. This description of CAT Scans is intended for a younger audience and also offers links to the visible human project.
Other
Z Dnet: Smart Chips Get Under Our Skin
As much as it may sound like something out of science fiction, developers have begun to experiment with "smart chips" skin implants to monitor the human body. This article is dated 2001.