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17 October 2012 Self-calibration for a multi-segment straight-line trajectory CT using invariant moment
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Multi-segment straight-line trajectory computed tomography (CT) requires accurate movement between each segment trajectories. In industrial applications for large objects, it is difficult and very cost-expensive for the mechanical and control system to ensure the accurate movement during the rotation process between two segment trajectories. Hence, precisely measuring the movement would be an alternative choice to acquire an exact reconstruction. In this work, we proposes a new method to measure the movement by using invariant moment of attenuation distribution images. Its accuracy improves as the number of projection data increases. The method is validated by both numerical and practical experiments. Reasonable CT reconstructions are obtained for a two-segment linear trajectory CT with coarse mechanical movement control modeled in our experiments.
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Xiyun Li, Zhiqiang Chen, Xiaolei Jiang, and Yuxiang Xing "Self-calibration for a multi-segment straight-line trajectory CT using invariant moment", Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85061K (17 October 2012);

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