The Imatron C-100 Cine-CT TM scanner is a multi-slice high speed Computed Tomography (CT) scanner that produces a pair of anatomically contiguous slices in 50 milliseconds. The scanner operates in several modes. In flow mode, the scanner images up to 8 anatomically contiguous slices in 224 milliseconds without moving the patient. In cine mode, the scanner acquires data at a rate of 34 images/second. In both of these modes, a typical run generates 80 images in just a few seconds. Most patient studies involve one or more cine runs and one or more flow runs. Thus, the C-100 often produces an order of magnitude more images per patient than any other CT scanner. The large amount of data involved in each study requires rapid, easy to use analysis software and efficient data archiving. The C-100 achieves fast scan times by eliminating all moving parts. It generates a moving x-ray fan by scanning a highly focused electron beam along semi-circular tungsten targets that partially surround the patient. The scanner acquires data with a solid-state detector system, converts it to digital form, and sends it via fiber optic cables to a 32 Mbyte dual-ported high speed bulk memory. An array processor and back-projector reconstruct the images, which are stored on a dual-ported 1.37 Gbyte hard disk system. The scanner incorporates two workstations, each containing its own graphic display system. The work-stations communicate with each other through the dual-ported disks. The system stores images for long-term archive on magnetic tape, multi-format film, videotape, or removable optical disks. The C-100 provides interactive image analysis software that includes cine display, func-tional imaging, time-density analysis for flow measurements, off-axis reformatting, cardiac wall motion analysis, and image subtraction. Data management software includes file selection, merging, deletion, archiving, and retrieval.