A method for reconstructing an image that can be recognized stably during
CAD. The method for reconstructing an image on the basis of a plurality
of views of projection data items provided by X-rays having passed
through a subject includes image reconstruction dedicated to a
computer-aided detection (CAD) mode. The image reconstruction comprises a
reconstruction function dedicated to the CAD mode, includes
pre-processing that includes a noise removal filter for removing a noise
from projection data, such as, a streaky artifact removal dedicated to
the CAD mode, and also includes post-processing that includes a noise
removal filter dedicated to the CAD mode.