Fast reconstruction method based on C-arm tomosynthesis

As the traditional tomosynthesis is not appropriate for C-arm based slice reconstruction, a modified tomosynthesis method, CTS (C-arm based tomosynthesis), was proposed. CTS method rotates and overlays all the X-ray projections in 3-D space according to the mapping matrices of different angles, which can get from the geometry of the C-arm. This method can be used for the limited-angle cone-beam reconstruction, which is very suitable for isocentric C-arm imaging. The algorithm simulations with projections of a hollow sphere and two hollow-cylinder models show good image quality and demonstrate CTS has high precision. The reconstruction from projections with noise was also conducted. The results show that CTS is noise-insensitive, which validates the feasibility of the method for C-arm 3-D imaging. Finally, the process that makes CTS method adapt to the non-isocentric C-arm was proposed.