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Analogic has developed an x-ray system made up of a dual-energy high-voltage power supply, an x-ray tube, and a detector array that increases accuracy when the system is used to assess the contents of luggage and cargo. Mounted on a gantry that rotates around a baggage conveyor, the system produces a group of projections taken at many angles around the bags. The data are then reconstructed via helical-cone beam-computed-tomography (CT) algorithms to generate sequential axial images, which are stacked to build a 3D image of the contents of each piece of luggage. Advanced automatic detection algorithms search the bag image data for weapons and explosives, and 3D images are displayed on the screener's workstation. If a suspect item is detected, it is highlighted for the operator, and the image of the object is extracted into its own, smaller viewing window. A combination of x-ray positioning, focal-spot size, collimating optics, and detector-array geometry establishes the imaging characteristics of the scanner to define the available image resolution. To limit artifacts, x-ray attenuating material is positioned in the beamline and refocused to the x-ray source focal spot. The 3D technology described can be used to detect a camouflaged object, and the volume or distance of an object can also be measured.
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Information Sources, Inc.
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