Systems and methods for characterizing spatial distortion in 3D imaging systems

摘要

Systems and methods (200) for characterizing spatial distortions in location data determined by an imaging system (102), for example as employed in imaged guided therapy A three dimensional phantom (104) is custom formed (204, 206, 210, 212, 214) for a desired imaging space (120) of a given imaging system (102) The phantom (104) includes a large plurality of control points (105) fixed rigidly in space to a high degree of known accuracy The phantom (104) is fixed to a stereotactic frame (108) defining a known calibrated reference or zero and imaged (216) An algorithm (218) customized for the phantom (104) determines the spatial locations of the control points (105). A (comparison 220) is made between the known and the determined spatial locations for at least a subset of the control points (105) The (comparison 220) results in indicia for any determined spatial distortions observed.