PROBLEM TO BE SOLVED: To provide an image reconstructing apparatus and program capable of easily corresponding to imaging embodiments of various projecting images and improving applicability.SOLUTION: The image reconstructing apparatus receives image data related to a plurality of projecting images transmitted through an observation object obtained from mutually different directions to the observation object, and based on a distribution function expressing the presence of a predetermined correlation among the pixels of the images of the observation object and a condition related on the process until the projection image is obtained based on the observation object, forms a calculation equation expressing a probability model for forming the projection image, and using a Bayesian inference, estimates the sectional image of the observation object from the calculation equation expressing the probability model and the image data.COPYRIGHT: (C)2013,JPO&INPIT【課題】種々の投影像の撮像態様に容易に対応でき、応用性を向上した画像再構成装置及びプログラムを提供する。【解決手段】観測対象に対して互いに異なる方向から得た、観測対象を透過した複数の投影像に係る画像データを受け入れ、観測対象の像の画素間に、予め定めた相関があることを表す分布関数と、当該観測対象に基づいて投影像が得られるまでの過程に係る条件とに基づいて、投影像を生成する確率的モデルを表す演算式を生成し、ベイズ推定を用いて、確率的モデルを表す演算式と、画像データとから観測対象の断面像を推定する画像再構成装置である。【選択図】図1