Free trajectory cone-beam computed tomography with synchronous scanning of geometric calibration phantom and imaging object Imaging method

In order to suppress the geometric artifacts caused by the random jitter of the ray source during scanning, and realize the flexible scanning trajectory of the ray source, and meet the requirements of task-driven scanning imaging, this paper proposes a free trajectory cone beam computed tomography (CBCT) imaging method. This method proposes a two-dimensional plane geometric calibration method. Based on this method, the geometric calibration phantom and the imaging object can be imaged at the same time, and then the geometric parameters are obtained through the online calibration method, and then combined with the geometric parameters to be applied to the alternating direction multiplier method (ADMM) Perform image iterative reconstruction. Experiments show that this method can obtain higher quality reconstructed images, with higher image contrast and clear feature edges. The root mean square error (RMSE) of the simulation experiment results is small, and the structural similarity (SSIM) values ​​are all above