Patent ID: 8768032

Claim:
A computer-implemented method for correcting artifacts in measured image data due to differential scatter rejection in a computed tomography system, the computed tomography system including an array of adjacent x-ray detector modules, the array having a first end and a second end located opposite the first end, each detector module having a grid of detector elements arranged in columns and rows, each column having associated measured values representing image data, the array of adjacent x-ray detector modules having at least one erroneous column of detector elements causing artifacts due to differential scatter rejection, the method comprising the steps of: for each erroneous column: (a) calculating predicted values for the image data associated with the erroneous column based on image data associated with a first column and a second column, the first column and the second column being on opposite sides of the erroneous column and the first end being closer to the first column than to the second column; (b) calculating adjusted values for the image data associated with the erroneous column by subtracting correction values associated with the erroneous column from the measured values associated with the erroneous column; (c) replacing the measured values associated with the erroneous column with the adjusted values from step (b); (d) increasing or decreasing the correction values associated with the erroneous column based on the difference between the predicted values for the erroneous column and the adjusted values for the erroneous column.