| 摘要 |
For the purpose of noise correction for an x-ray flat-panel detector ( 2 ) it is firstly provided that in the dark image-without radiation impinging on the detector panel ( 4 )-the noise is recorded for the subareas of an active area ( 8 ) and from this, subarea-specific correction factors are determined by means of which the respective signal value of the respective subarea is corrected in imaging operation. A dark area correction factor (DF 1 , DF 2 ) is also determined in each case from the noise of two dark areas ( 6 ) that are spaced apart with respect to each other. In order to determine subarea-specific signal correction factors (SK), each of the DA correction factors (DF 1 , DF 2 ) is weighted with a subarea-specific weighting factor (g 1 , g 2 ), in particular a distance factor (a). By means of said measure improved noise correction is achieved.
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