The equipment (10) that the present invention relates to a kind of to degenerate for determining the x-ray flux that space relies on photon spectra variation, the x-ray flux that space of the one kind for determining for X-ray tube (20) relies on is degenerated and the system (1) of photon spectra variation, a method of the x-ray flux relied on for the space for X-ray tube (20) is degenerated and photon spectra variation, it is a kind of for controlling this computer-readable medium for executing such equipment (10) of method or the computer program element of system (1) and being stored with such computer program element. For determining that the x-ray flux degeneration that space relies on and the equipment (10) that photon spectra changes include acquisition unit (11), processing unit (12), computing unit (13) and assembled unit (14). The acquisition unit (11) is configured as the x-ray flux degraded data that acquisition is directed to X-ray tube (20). The processing unit (12) is configured as handling x-ray flux degraded data into the flux degraded data relied on for space. The computing unit (13) is configured as the spectrum at least calculating the photon spectra variation of X-ray tube (20) and photon spectra variation being converted into space dependence. The spectrum that the flux degraded data and the space that the assembled unit (14) is configured as relying on the space rely on is combined.
