Abstract
Small geometric misalignments of micro computed tomography (CT) system will cause geometric artefacts in the reconstructed image. A new correction method of geometrical artefacts based on marker and non-linear optimisation model is proposed. In this method, the simple balls marker and the measured objects are scanned simultaneously, and the geometric parameters of the micro-CT system are precisely estimated by solving the non-linear optimisation model which is based on the scanning data. The geometric artefacts caused by geometric parameters are corrected and the authors can reconstruct the image correctly. In addition to estimating geometric parameters for the traditional scanning mode, the proposed method can also be used for the limited angle CT scanning and the half detector CT scanning. Simulated experiments and real experiments verify that the correction method effectively decrease the geometric artefacts of micro-CT images.
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