Correction apparatus, method and program for correcting artifacts

A correction method for correcting an artifact of a CT image, comprising:

• acquiring a measured projection image,
• setting a virtual energy different from the measured energy that is the energy of the X-ray irradiated at the time of acquiring the measured projection image,
• calculating a projection image under an assumed condition at the time of irradiating the X-ray of the virtual energy,
• performing dual energy decomposition,
• evaluating a temporarily corrected image obtained by the dual energy decomposition with a consistency index to identify an optimum condition among the assumed conditions, and
• generating a projection image under the optimum condition as a correction image.

A non-transitory computer readable recording medium having recorded thereon a correction program for correcting an artifact of a CT image, the program causing a computer to execute the following processes of:

• acquiring a measured projection image,
• setting a virtual energy different from the measured energy that is the energy of the X-rays irradiated at the time of acquiring the measured projection image,
• calculating a projection image under an assumed condition at the time of irradiating the X-ray of the virtual energy,
• performing dual energy decomposition,
• evaluating a temporarily corrected image obtained by the dual energy decomposition with a consistency index to identify an optimum condition among the assumed conditions, and
• generating a projection image under the optimum condition as a correction image.