PROBLEM TO BE SOLVED: To provide a radiation imaging device capable of reducing artifact in an acquired reconstruction image by estimating non-uniformity of incidence distribution for a detector, and accurately estimating an amount of incident radiation.SOLUTION: A radiation imaging device includes an X-ray source 120 for irradiating an X-ray, a detection part 150 in which pixels consisting of a plurality of sub-pixels for detecting the X-ray are arrayed two-dimensionally, a signal processing part 152 for generating an output signal according to the intensity of the X-ray based on a detection signal by the sub-pixels, a signal adding part for generating an X-ray count signal for each pixel by adding output signals of sub-pixels belong to the pixel, and an image generation part for generating an image based on the X-ray count signal. The image generation part includes a non-uniformity estimation part for estimating non-uniformity of X-ray incidence distribution for the processing object pixel based on the X-ray count signal of the processing object pixel and the X-ray count signal of the pixel located in the vicinity of the processing object pixel.SELECTED DRAWING: Figure 1【課題】検出器に対する入射分布の非一様性を推定して、入射した放射線量を正確に推定することにより、取得される再構成画像におけるアーチファクトを低減させる放射線撮像装置を提供する。【解決手段】Ｘ線を照射するＸ線源１２０と、Ｘ線を検出する複数のサブピクセルからなるピクセルを二次元配列した検出部１５０と、サブピクセルによる検出信号に基づいてＸ線の強度に応じた出力信号を生成する信号処理部１５２と、ピクセルに属するサブピクセル子の出力信号を加算することによりピクセル毎のＸ線計数信号を生成する信号加算部と、Ｘ線計数信号に基づいて、画像を生成する画像生成部と、を備え、画像生成部が、処理対象ピクセルのＸ線計数信号と、処理対象ピクセルの近傍に位置するピクセルのＸ線計数信号とに基づいて、処理対象ピクセルのＸ線入射分布の非一様性を推定する非一様性推定部を備える放射線撮像装置。【選択図】図１
