| 主权项 |
1. An x-ray detecting apparatus for the detection and localisation of ionising x-ray or gamma radiation in radiography, the apparatus comprising:
an x-ray detector including:
conversion means for converting x-ray photons of an incident x-ray photon beam into electrical charges; andnon-linear amplification means for amplifying, within the detector, the electrical charges by a non-linear amplification gain factor, said non-linear amplification factor being characterised by a decrease in amplification gain in response to an increase in the flux of the incident x-ray photon beam at high incident x-ray fluxes; and amplification gain adjustment means configured to vary the non-linear amplification gain of the non-linear amplification means according to the emission parameters of an x-ray source providing the incident x-ray photon beam for the radiographic examination to be performed and/or according to the transmitted beam received by the detector from the x-ray source via a subject being imaged, wherein the adjustment means is configured to optimize the non-linearity of the amplification gain of the non-linear amplification means such that the difference between the amplification gain at low x-ray flux and the amplification gain at high x-ray flux is optimized by exploiting a saturation effect. |
