Basic configuration of our first micro-CT scanner, built in 1993 for scanning specimens. The specimen rotates within a stationary x-ray source/detector array x-ray image system. The x-ray image-to-light conversion is performed by a thin CsI (Tl) crystal layering deposited on a thin, transparent, glass-like window. This light image is projected onto the CCD imaging array via an optical lens. Magnification of the x-ray image is achieved altering the lens position between the CsI and CCD. Because the x-ray source is a relatively long way from the specimen and the specimen is relatively close to the CsI crystal plate, the x-ray focal spot size can be fairly large, thus allowing increased power.