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A novel quasi-linearization method was developed for CT image reconstruction in scanners with a multi-energy detector system. The non-linear equation relating material attenuation coefficients to measured data was reduced to a system of linear equations by means of piece-wise constant approximation of attenuation functions. A material decomposition algorithm was proposed to obtain a physically meaningful solution of this system for the case of N = 2 (dual-energy CT scanners). Image reconstruction methods (the new one and the classical filtered backprojection with beam-hardening correction) were implemented to measured CT data. The new method consistently provides more accurate density results in image reconstruction for the objects containing materials with significantly different attenuation coefficients.
Date of Publication: April 2010