Dual Energy Computed Tomography (DECT) is an imaging modality, which in recent years has gained a foothold in the diagnosis of several types of micro-lesions. DECT provides information on a tissue reaction when it is affected by different energy levels. This gives you information about its composition, based on the known K-edge value of different substances. K-edge is defined by the maximum visual attenuation of a substance in a DECT scan when it is affected by a certain amount of energy. The energy required to achieve a given k-edge depends on the individual substances atomic size, and therefore increases with the atomic mass.