Patent ID: 7511747

Claim:
A method of correcting digital noise generated by a flat-panel detector having a matrix-type detector panel and a plurality of readout amplifiers for reading out signals detected by the detector panel, the flat-panel configured to detect X-ray radiation and the detector panel comprising a dark area and an active area having a plurality of sub-areas, the method comprising: measuring a digital noise generated by at least one of the sub-areas when the detector panel is not exposed to radiation; calculating a correcting parameter for a respective sub-area based on the measured digital noise; correcting an output signal of the respective sub-area when the detector panel is exposed to radiation during an operation of the detector panel using the correcting parameter; measuring a digital noise generated by a first dark area and a second dark area spaced apart from one another; determining a first dark area correcting parameter (DF 1 ) and a second dark area-correcting parameter (DF 2 ) for the first and the second dark areas using the measured digital noise generated by the first and second dark areas; and calculating a signal correcting parameter (S k ) individualized for a k th sub-area by weighting the first and the second dark area correcting parameters (DF 1 ) and (DF 2 ) with a first weighting factor (g 1 ) and a second weighting factor (g 2 ), wherein the first and the second dark area correcting parameters (DF 1 ) and (DF 2 ) are weighted in accordance with the following relationship: S k =0.5 *(DF 1 *(DF 1 *(1âˆ’Î±)+DF 2 * Î±), where Î± represents a distance from the k th sub-area to the first dark area, 1âˆ’Î±=g 1 , and Î±=g 2 .