1. A method for analyzing materials in an object, said method comprising: acquiring x-ray projection data of the object at high energy and at low energy for a plurality of views; utilizing the acquired x-ray projection data in a material decomposition to determine material densities at each pixel for two selected basis materials; determining a composition of an object at each pixel utilizing a determined mapping of material density regions for the two selected basis materials; and displaying an image indicative of the composition of the object utilizing the determined composition.