Fast localization method in cone-beam computed tomography

For the measurement of localization parameters in cone-beam computed tomography (CBCT), a simple standard round bar measurement tool was designed, and a fast localization method based on the bar was proposed. The method should capture four projection images of the round bar tool in four positions of the CBCT imaging region, and then by using the imaging features of the tool in the CBCT system, five localization parameters influencing the image quality of the slice would be found out fastly. The experimental results show that the method can obtain the localization parameters with sub-pixel precision in few minutes, and the image quality of the slice reconstructed by the parameters has been improved obviously.