An assembly of diagnostic x-ray computed tomography (CT) devices with a gantry large enough to allow imaging of any part of the body. It includes designs with single or multiple fixed annular arrays of x-ray tubes and opposing detectors or those with x-ray tube(s) and opposing detector assemblies that rotate rapidly around a central axis point within the gantry imaging area. It can produce two and/or three-dimensional (3-D) cross-sectional (tomographic) images, including spiral CT or other special imaging applications at multiple specified angles in relation to body position. It may use a variety of digital techniques for information capture, image reconstruction, and display.