In the x-ray image pickup device, revision function for scattered x-rays revision and revision function for beam hardening revision are decided simply and high accuracy, precision of revision is raised by revising in appropriate order making use of the revision function where the revision precision which is decided is high, the technology which improves picture quality is offered. It revises in order of scattered x-rays revision and beam hardening revision making use of beam hardening revision function and the scattered x-rays revision function which were calculated from the measurement data for revision functional calculation. As for scattered x-rays revision function, transmitted distance, changing the scattered x-rays quantity, the data which it measures it closely resembles to every transmitted distance, it matches the correction value which is obtained to the transmissivity data. On the one hand, at the time of beam hardening revision functional calculation, changing transmitted distance, it converts the data which it measures to the projection data, it obtains the desired value of the beam hardening quantity the straight line by closely resembling.X線撮像装置において、散乱X線補正用の補正関数およびビームハードニング補正用の補正関数を簡易かつ高精度に決定し、決定した補正精度の高い補正関数を用いて適切な順序で補正を行うことにより、補正の精度を高め、画質を向上させる技術を提供する。補正関数算出用の計測データから算出したビームハードニング補正関数および散乱X線補正関数を用い、散乱X線補正、ビームハードニング補正の順に補正を行う。散乱X線補正関数は、透過距離、散乱X線量を変えて計測したデータを透過距離毎に近似し、得られた補正値を透過率データに対応づける。一方、ビームハードニング補正関数算出時は、透過距離を変えて計測したデータを投影データに変換し、直線近似することによりビームハードニング量の理想値を得る。
