Abstract
To improve the quality of the images, and therewith possibly measurement results of cone-beam CT, a sequence of corrections must be applied. Examples of such corrections are bad-pixel elimination, flat-field (shading) correction, image rectification, deconvolution of the detector’s PSF, scatter elimination, and beam-hardening correction. The latter can be described by a lookup table for the relation of measured grey value and radiographed material thickness. In this work, a test device with a nearly cone-like-shaped attenuator is presented for the measurement of the beam hardening curve in a straightforward way. Its usability is experimentally investigated and compared with ab-initio image simulations. The results show the strong dependence of the beam hardening curves on the detectors structure, that can be used to verify the model assumptions — especially the scintillator’s thickness and composition.
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