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Material decomposition refers to using the energy dependence of materialphysical properties to differentiate materials in a sample, which is a veryimportant application in computed tomography(CT). In propagation-based X-rayphase-contrast CT, the phase retrieval and Reconstruction are alwaysindependent. Moreover, like in conventional CT, the material decompositionmethods in this technique can be classified into two types based onpre-reconstruction and post-reconstruction (two-step). The CT images oftensuffer from noise and artifacts in those methods because of no feedback andcorrection from the intensity data. This work investigates an iterative methodto obtain material decomposition directly from the intensity data in differentenergies, which means that we perform phase retrieval, reconstruction andmaterial decomposition in a one step. Fresnel diffraction is applied to forwardpropagation and CT images interact with this intensity data throughout theiterative process. Experiments results demonstrate that compared with two-stepmethods, the proposed method is superior in accurate material decomposition andnoise reduction.

Material decomposition for dual-energy propagation-based phase-contrast CT