Correction techniques for detector systems in 3D-CT

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Abstract
At BAM 3D-computerized tomography (3D-CT) using x-ray cone beam and area detectors is established as a standard method for materials testing and development. Up to now main applications concerned fiber reinformed plastics and ceramics, density distribution in ceramics, powder metallurgical parts and archaeological objects. Spatial and density resolution depends on the object and on the combination x-ray source - detector system. The maximum spatial resolution is 5 micrometers using a transmission target and 12 micrometers using a standard micro focus tube together with an image intensifier as detector. The main problem of image intensifiers applied to 3D-CT is the rather bad contrast ratio of about 20:1. An object dependent correction for the light scattering in the image intensifier in combination with bam hardening correction is performed at BAM. This contribution will point out the advantages and disadvantages of different detector systems and results will be shown on test samples and selected investigation from our ongoing work.

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