Patent ID: 7672426
Filing Date: 2010-03-02
Classification: G01N,G01V

Abstract:
1. A scanning unit for inspecting cargo conveyances, the scanning unit comprising: a radiation source to emit a beam of radiation; a rotatable platform configured to support a cargo conveyance for inspection by the beam of radiation, the rotatable platform being rotatable about an axis; and a detector positioned to collect at least certain of the radiation transmitted through the cargo conveyance, the detector comprising a plurality of modules separated by at least one gap; wherein: at least one of the platform, the source, or the detector is movable along a direction of the axis; and the plurality of detector modules are positioned with respect to a ray from the source through a center of rotation of the object during rotation by the platform such that a mirror image of first detector modules on one side of the ray, projected onto the other side of the ray, at least coincides with the at least one gap between second detector modules on the other side of the array, to collect a sufficient data set of radiation to reconstruct computed tomographic images.