PROBLEM TO BE SOLVED: To provide a calibrator of X-ray CT system capable of improving the accuracy of estimation of internal shape using an X-ray CT system by carrying out beam hardening treatment by utilizing difference in diameter of ruby spheres on a calibrator which constituted of plural ruby spheres.SOLUTION: A correction method using an X-ray calibrator is for improving an error which is obtained in the following manner that: after calculating a coefficient from a diameter dimension (true value) of a ruby sphere which is obtained by means of three-dimensional measurement and an inverse number of a ratio (%) of average values of diameter dimension of the ruby sphere from a piece of image data of an X-ray CT, and by multiplying the coefficient by the ratio (%) of the diameter with respect to the true value.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】X線CT装置による内部形状評価の精度向上を目的として複数のルビー球からなる校正器に対して、ルビー球の径の違いを利用したビームハードニング対策を行うこと。【解決手段】三次元計測によるルビー球の径寸法(真値)とX線CTの画像データからのルビー球の径寸法の割合(%)平均値の逆数から係数を求め、係数を真値に対する径の割合(%)に掛けることにより求めた誤差を改善し得るX線校正器による補正方法である。【選択図】 図1
