In reconstructing a cross-sectional image by successive approximation calculation, the requirements of the operator In order to provide an image reconstruction device that can create an image having a picture quality depending, and calculates the projection data obtained reconstructed image which is reconstructed on the basis of the measured projection data by forward projection calculation, the measured projection data An image reconstructor for a successive approximation calculation based on a difference between an input unit for image quality parameter the operator to emphasize is input, a weight calculator for calculating a weighting factor based on said image quality parameter, the and characterized by comprising a, a successive approximation calculation section performing successive approximation on the basis of the pixel value to the weighted addition value obtained when the pixel value and the previous iteration to determine therefrom with a weighting factor.逐次近似計算により断面画像を再構成する際に、操作者の要求に応じた画質を有する画像を作成できる画像再構成装置を提供するために、計測投影データに基づいて再構成された再構成像を順投影計算して得られた計算投影データと、前記計測投影データとの差分に基づいて逐次近似計算をする画像再構成装置であって、操作者が重視する画質パラメータが入力される入力部と、前記画質パラメータに基づき重み係数を算出する重み算出部と、前記重み係数を用いてこれから求める画素値と前回反復時に求めた画素値とを加重加算した値に基いて逐次近似計算を行う逐次近似計算部と、を備えることを特徴とする。
