What is dual energy CT (DECT)?
In DECT, two sets of CT images are (nearly) simultaneously acquired at two different (low and high kilovoltage) mean x-ray beam energies. These images are then combined to create new images that highlight or suppress certain tissues of interest based on differential attenuation of the x-rays at different energies. For example, although iodine in contrast material and calcium in bone have similar high attenuation on standard CT images, the attenuation of iodine increases more markedly than calcium on low kilovoltage images relative to high kilovoltage images. Thus, new CT images demonstrating the contrast-enhanced vessels while suppressing surrounding bones can be created.