X-ray CT apparatus, and image processing apparatus

An image processing apparatus, comprising:

• a processor;
• and
• a memory that stores processor-executable instructions that, when executed by the processor, cause the processor to:
• acquire first projection data that is based on a first spectrum representing an amount of radioactive rays in a unit of energy of the radioactive rays having passed through a subject and detected by a detector;
• generate second projection data by correcting the first projection data based on a response characteristic of the detector;
• and
• apply a reconstruction process to the second projection data,
• wherein the first projection data is a set of first sinoarams that are based on photon counts in a unit of a first energy band in the first spectrum, and
• the second projection data is a set of second sinograms that are based on photon counts in a unit of a second energy band and that are acquired by correction of the first sinograms by the processor.