Problem to be solved: to provide an image reconstruction apparatus for automatically selecting and executing an appropriate all purpose processing method for changing the apparatus configuration.An image reconstruction apparatus is composed ofHaving multiple arithmetic unitsIt has a data processing unit which reconstructs a three-dimensional image of an object based on multiple two-dimensional radiation projected image dataData processing equipmentTo divide the numerical data of a three-dimensional image into a plurality of arithmetic devicesA forward projection calculation means for performing forward projection calculation for each of a plurality of computing devices for assigned numerical data andA plurality of contracting and dispersing means for compressing numerical data held by a plurality of arithmetic devices and distributing them to a plurality of computing devices are performed by different processing methodsIt has a decision means for determining one contracting dispersion means based on the processing result of the reduced variance meansFor two-dimensional data of two-dimensional images obtained by forward projection calculationThe reconfiguration processing is carried out using the determined reduction variance means.Diagram【課題】装置構成の変更に対して適切なオールレデュース処理法を自動的に選択して実行する画像再構成装置を提供する。【解決手段】画像再構成装置は、複数の演算装置を有し、複数の２次元放射線投影像データを基に被写体の３次元画像を再構成するデータ処理装置を有し、データ処理装置は、３次元画像の数値データを分割し複数の演算装置に割り当て、割り当てられた数値データに対して複数の演算装置の各々に順投影計算を行わせる順投影計算手段と、複数の演算装置が保持する数値データを縮約し複数の演算装置に分散する処理を互いに異なる処理法で行う複数の縮約分散手段と、縮約分散手段の処理結果を基に１つの縮約分散手段を決定する決定手段とを有し、順投影計算により得られた２次元画像の数値データに対し、決定された縮約分散手段を用いて再構成処理を行う。【選択図】図３
