The application discloses a high-precision industrial
CT imaging system geometric parameter
correction method and
system, which comprises the following steps: step 1, a phantom is arranged at the center of a rotating table of an actual
cone beam CT, the distance between a jth marker point in the phantom and a selected marker point is D real in a space coordinate
system; step 2, actual projection data (v ij ,w ij ) of the jth marker point at an ith sampling angle in a
detector local coordinate system is determined; step 3, predicted projection data (v i (ζ j ),w i (ζ j )) of the jth marker point at the ith sampling angle in the
detector local coordinate system in a circular trajectory cone beam mode is obtained; step 4, the
mean square error between (v ij ,w ij ) and (v i (ζ j ),w i (ζ j )) is set as a target function, and an optimal geometric parameter vector of the jth marker point is obtained, wherein the geometric parameter vector comprises the distance D rec between the jth marker point and the selected marker point in the space coordinate system and the distance sod between a
ray source and the center of the rotating table; and step 5, the corrected distance sod real between the jth marker point and the selected marker point in the space coordinate system is obtained by using D rec , D real and sod.