A polychromatic X-ray beam causes the grey of the reconstructed image to depend on its position within a solid and the material\nbeing imaged. This factor makes quantitative measurements via computed tomography (CT) imaging very difficult. To obtain\na narrow-energy-width reconstructed image, we propose a model to decompose multivoltage X-ray images into many narrowenergy-\nwidth X-ray images by utilizing the low frequency characteristics of X-ray scattering. It needs no change of hardware in the\ntypicalCTsystem. Solving the decompositionmodel, narrow-energy-width projections are obtained and it is used to reconstruct the\nimage. A cylinder composed of aluminum and silicon is used in a verification experiment. Some of the reconstructed images could\nbe regarded as real narrow-energy-width reconstructed images, which demonstrates the effectiveness of the proposed method.
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