Method for handling image data, it include: to receive sum image data (28) and difference image data (30), wherein sum image data (28) include that two different energy of the strength information (18) of the X-ray of difference image data pass through object (20), two different energy of the sum image data (28) based on summed intensity and two different energy sources of above-mentioned difference image data (30) based on varying strength from (30)； Divide low frequency and high-frequency range (34) that unusual place image data (30) arrives (32)； And it generates low noise image data (36) and passes through the error image (30) of replacement high-frequency range (32) and the sum image data (28) in vhf range base.
