ADAPTIVE GRADIENT WEIGHTING TECHNIQUE FOR DETECTOR BAD CELL CORRECTION

摘要

An imaging system includes a two-dimensional detector having a plurality of cells wherein each cell is configured to detect energy or signal passing through an object. The imaging system includes a computer programmed to acquire imaging data for the plurality of cells, identify a cell to be corrected, based on the imaging data, interpolate I_x and I_y for the identified cell based on neighbor cells, and calculate local gradients g_x and g_y between the identified cell and its neighbor cells based on the interpolation. The computer is further programmed to calculate weighting factors w_x and w_y based on the local gradients, calculate a corrected final value I(0,0) for the identified cell, and correct the identified cell with the corrected final value.