Homemade computed tomography setup with FDK reconstruction software

X-ray source, detector and rotation stage as the sample holder were used to built the hardware part of the homemade CBCT scanner. The full scale numerical simulation of the CBCT experiment was modified to complete the scanner. This C/C++ software package is capable to process an arbitrary CT experimental or synthesized data for 3D reconstruction using the FDK method. The high degree of the package's flexibility allows different CBCT recording and reconstruction geometries with different source and detector positions and their spatial trajectory. The classical computed tomography arrangement, when the gantry, rotating around the sample, is loaded with the opposed sources and detectors, was replaced by the rotating sample and fixed source and detector. Mismatches between these two schemes in reconstruction procedure such as misplacement of the rotation axis from the expected location and other misalignments are compensated by introducing the corresponding variables in the reconstruction software.