PROBLEM TO BE SOLVED: To provide an image processing device capable of correcting a ring artifact that occurs in the central part.SOLUTION: An image processing device includes: a superimposed image generation part for acquiring projection data for each angle generated by irradiating radiation to a subject from various angles, and generating a superimposed image by superimposing a plurality of the acquired projection data a correction image generation part for generating a difference image in which a brightness value of each pixel is determined based on a brightness difference between the pixel and surrounding pixels in each pixel of the superimposed image, and generating a correction image in which the code of the difference image is inverted and an image correction part for correcting a reconstructed image generated on the basis of a plurality of projection images, based on the correction image.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】中心部に生じたリングアーチファクトの補正が可能な画像処理装置を提供する。【解決手段】画像処理装置は、さまざまな角度から放射線を被検体に照射して生成した角度ごとの投影データを取得し、取得した複数の投影データを重ね合わせて重合画像を生成する重合画像生成部と、重合画像の各画素において、当該画素と周囲の画素との輝度の差に基づいて各画素の輝度の値を決定した差分画像を生成し、さらに前記差分画像の符号を反転させた補正用画像を生成する補正用画像生成部と、複数の投影画像に基づいて生成する再構成画像を、補正用画像に基づいて補正する画像補正部と、を備える。【選択図】図1
