Geometric Calibration Using Line Fiducials for Cone-Beam CT with General Non-Circular Source-Detector Trajectories

摘要

PurposeTraditional BB-based geometric calibration methods for cone-beam CT (CBCT) rely strongly on foreknowledge of the scan trajectory shape. This is a hindrance to the implementation of variable trajectory CBCT systems, normally requiring a dedicated calibration phantom or software algorithm for every scan orbit of interest. A more flexible method of calibration is proposed here that accommodates multiple orbit types — including strongly noncircular trajectories — with a single phantom and software routine.