It is possible to provide a computer tomography device and a program which define an evaluation function E including a projected image calculated from f(x, y) and a measured projected image for a tentative tomogram f(x, y) obtained by a certain method and change f(x, y) so that E is substantially decreased, thereby obtaining a tomogram corresponding to the projected image. The device and the program do not require a back-projection operation which is required in the conventional computer tomography and effectively remove/reduce a metal artifact and an aliasing artifact.
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