This invention discloses a geometric parameter calibration method for an X-
ray imaging
system, relating to the field of
medical imaging equipment technology. This invention significantly improves the adaptability of portable X-
ray equipment in scenarios involving rapid switching between pets of various sizes through an
anatomical feature-driven parameter self-calibration mechanism. Utilizing the inherent proportional relationships of mammalian skeletons, such as the ratio of
intervertebral space to rib width, geometric parameter calibration is completed in a
single exposure, eliminating reliance on traditional physical calibration modules and avoiding proportional
distortion of reconstructed images due to size differences. For live
respiratory motion,
respiratory frequency components are separated in the
frequency domain of the projection data, and displacement errors are dynamically corrected through reverse compensation, effectively suppressing
motion artifacts without the need for external
control equipment. For the edge
distortion problem of low-cost detectors, a polynomial
distortion model is constructed based on the symmetry of 180° projection, combined with a robust iterative optimization
algorithm, to automatically complete calibration during initial power-on or periodic scans.