A method includes obtaining a set of energy dependent data generated from a spectral scan. The set of energy dependent data includes a sub-set of data corresponding to only contrast agent. The method further includes separating the sub-set of data from other data of the energy dependent data. The other data includes non-contrast agent data. The method further includes scaling the sub-set of data to change a concentration of the contrast agent in the sub-set of data from that of the sub-set of data. The method further includes visually presenting at least the scaled sub-set of data.
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