Fig. 4

The tissue attenuation curve (top figure) is lower for ischemic areas than for normal areas of the myocardium, causing ischemic myocardium to be visible as hypo-attenuated areas (red arrows, bottom figures). The static CT-MPI images represent multiple kV levels, showing the possibilities of dual-energy CT to enhance the hypo-attenuation of the ischemic area by using varying kV levels exploiting the dual-energy abilities. The blue boxed image represents the traditional single-energy static CT-MPI acquisition. The most right image shows a dynamic CT-MPI color-coded map (mL/100 mL/min) of the short axis based on quantitative myocardial blood flow data