An image reconstruction method for improving CT spatial resolution

作者：Fu Jian^*; Tan Ren Bo; Zhao Feng

来源：Journal of Aerospace Power, 2013, 28(5): 971-976.

• Image reconstruction methods
• Industrial computed tomography
• Industrial CT
• Iteration techniques
• Iterative update
• Projection data
• Reconstruction algorithms
• Spatial resolution

In order to improve the spatial resolution of industrial computed tomography (CT) without changing the hardware, the half-pixel offset scanning mode was analyzed and a direct reconstruction algorithm, which was based on the algebraic iteration technique, was proposed. This algorithm adopted area-weight to execute directly the iterative update of the reconstructed value using the acquired projection data. Computer simulation analysis with a star-type spatial resolution phantom was implemented and a modulation of 0.8 was reached at the cut-off frequency. It demonstrates that the proposed method has the potential of improving the spatial resolution. The industrial CT experimental results of a standard spatial resolution phantom validate the feasibility and the effect of the method. The proposed approach is easy to implement and has a promising application future.

• 出版日期2013
• 单位北京大学