The present invention acquires metal region-specifying data (p1c) by specifying a metal region in measured projection data (p1) from the measured projection data (p1) and a measured reconstructed image (R1) in which the measured projection data (p1) has undergone image reconstruction. It is difficult to correctly specify a metal region (Y1) in the measured projection data (p1) since, in an image produced therefrom, metal regions such as wires or screws have pixel values that do not differ significantly from the pixel values of other regions, however, the present invention is able to specify the metal region (Y1) with higher accuracy. Image reconstruction is performed and a replaced reconstructed image (R2) that does not have the metal region (Y1) is generated by replacing, on the basis of the metal region-specifying data (p1c), the data of the metal region (Y1) in the measured projection data (p1) with data (Z) obtained on the basis of pixels near the metal region (Y1), and acquiring replaced projection data (p2). Because the metal region (Y1) is specified with higher accuracy, the tissue near the metal region (Y1) in the tomographic image (replaced reconstructed image (R2)) can be restored with higher accuracy.
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