A Novel Geometric Parameter Self-Calibration Method for Portable CBCT Systems

In outdoor environments or with space restrictions, it is difficult to transport and use conventional computed tomography (CT) systems. Therefore, there an urgent need for rapid reconstruction of portable cone-beam CT (CBCT) However, owing its portability the characteristics temporary construction environments, high precision spatial location achieve CBCT To overcome these limitations, we propose iterative self-calibration improvement method a self-calculated initial value based on projection relationship image features. The open field was used as weight data in subsequent experiments reduce nonlinear attenuation intensity. Subsequently, obtained invariance rotation axis. Finally, realized iteratively using reconstructed image. This overcomes main problem axis calibration algorithm—high similarity between adjacent positions symmetrical homogeneous materials. proposed not only improves relationship, but also reduces performance cost solution time algorithm Thus, satisfies requirements