Cone-beam computed laminography frequency domain information distribution and missing model

The objective of this study is to analyse and validate the distribution and missing regions in the frequency domain space of the projection information obtained from Cone-beam Computed Laminography (CBCL) scanned samples. Furthermore, the aim is to establish a frequency domain information distribution and missing model for CBCL. This paper employs the Fourier slice theorem to ascertain the spatial region of the frequency domain wherein the CBCL projection information is situated. To this end, the geometrical structure of the CL system and the spatial propagation characteristics of the cone-beam rays are subjected to analysis. Furthermore, the veracity of the model for the missing information in the CBCL frequency domain is validated through an iterative reconstruction process, whereby different regions of the frequency domain space are reconstructed through an iterative reconstruction algorithm that takes only the projection information as a constraint. The CBCL frequency domain missing information model can be employed as a priori information in the frequency domain space to facilitate further optimisation and improvement of image reconstruction.