A method of and a system for destreaking the photoelectric image in
multi-energy computed tomography are provided, wherein the photoelectric
projections are generated from the projection data acquired using at
least two x-ray spectra for scanned objects; wherein a neighboring scheme
is provided; the method comprises computing the statistics including mean
and standard deviation using the neighboring scheme; calculating an upper
limit and a lower limit from the computed statistics; detecting outliers
in the photoelectric projections using the upper and lower limits; and
replacing values of outliers using the upper or lower limit.