Narrow-Energy-Width CT Based on Multivoltage X-Ray Image Decomposition

Abstract EN

A polychromatic X-ray beam causes the grey of the reconstructed image to depend on its position within a solid and the material being imaged.

This factor makes quantitative measurements via computed tomography (CT) imaging very difficult.

To obtain a narrow-energy-width reconstructed image, we propose a model to decompose multivoltage X-ray images into many narrow-energy-width X-ray images by utilizing the low frequency characteristics of X-ray scattering.

It needs no change of hardware in the typical CT system.

Solving the decomposition model, narrow-energy-width projections are obtained and it is used to reconstruct the image.

A cylinder composed of aluminum and silicon is used in a verification experiment.

Some of the reconstructed images could be regarded as real narrow-energy-width reconstructed images, which demonstrates the effectiveness of the proposed method.