Data processing system, data processing method, and data processing program

A data processing method in a data processing system including a first data processing apparatus that processes projection data from a photon counting detector which detects radiation emitted from a radiation source and transmitted through a subject and which outputs a plurality of pieces of projection data assigned to each of three or more energy bands corresponding to the number of photons of the radiation and a second data processing apparatus, the method comprising:

• causing a computer to, in the first data processing apparatus, derive at least one piece of first compressed projection data by making resolution of at least one piece of first projection data of at least one energy band among the plurality of pieces of projection data relatively lower than resolution of projection data of a plurality of other energy bands other than the at least one energy band, and
• transmit the at least one piece of first compressed projection data and the projection data of the plurality of other energy bands to the second data processing apparatus.

A non-transitory computer-readable storage medium that stores a data processing program that causes a computer to execute data processing in a data processing system including a first data processing apparatus that processes projection data from a photon counting detector which detects radiation emitted from a radiation source and transmitted through a subject and which outputs a plurality of pieces of projection data assigned to each of three or more energy bands corresponding to the number of photons of the radiation and a second data processing apparatus, the data processing program causing the computer to execute:

• in the first data processing apparatus, a procedure of deriving at least one piece of first compressed projection data by making resolution of at least one piece of first projection data of at least one energy band among the plurality of pieces of projection data relatively lower than resolution of projection data of a plurality of other energy bands other than the at least one energy band;
• and
• a procedure of transmitting the at least one piece of first compressed projection data and the projection data of the plurality of other energy bands to the second data processing apparatus.