Patent ID: 8401143

Claim:
An arrangement for three-dimensional electron beam tomography, comprising: an electron-optical system for generating, focusing and deflecting an electron beam within a vacuum chamber in an electron beam direction; a target arranged within the vacuum chamber for decelerating the electron beam and for generating X-ray radiation, the target including a target base body and an applied conversion layer; an X-ray detector subdivided into a plurality of circular-arc segments and arranged within the vacuum chamber; a receiving opening for an examination object, the target surrounding the receiving opening for the examination object, the target having an inner side; electron beam stops arranged within the vacuum chamber; and a detector collimator arranged within the vacuum chamber; wherein: the target is formed as a cylindrical ring tapering in the electron beam direction; the circular-arc segments of the X-ray detector surround the target, and the plurality of circular-arc segments of the X-ray detector are arranged at a plurality of axial distances; the target is fixed and allows radiation to pass therethrough; the X-ray detector is fixed; the electron beam is forced into a spiral path by the electron-optical system and thereby generates a spatially spiral-shaped focal-spot path on the inner side of the target or the electron beam is successively forced into circular paths with different diameters by the electron-optical system and thereby generates a spatial focal-spot path that consists of a multiplicity of circles with different diameters on the inner side of the target.