| 摘要 |
Cone-like radiation is irradiated from each of different directions of projection to an object, and projection image signals of different energy bands are acquired with respect to the object and each of the different directions of projection. Energy subtraction processing is performed on the projection image signals of the different energy bands, which projection image signals have been acquired with respect to the same direction of projection, and an energy subtraction-processed projection image signal is thus formed with respect to each direction of projection. A three-dimensional image or a tomographic image of the object is formed from the energy subtraction-processed projection image signals, which have been formed with respect to the different directions of projection. The object image is thus formed such that a pattern of a specific structure having low contrast, such as a diseased part in the object, can be detected easily.
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