System for providing images for endoleak detection

A system for providing images for detecting an endoleak after a stent graft has been placed within the aorta of a person at a stent graft location, the system comprising:

• a spectral computed tomography projection data acquisition unit for acquiring, after a first contrast agent has been injected at a first time and a second contrast agent has been injected at a second time into the person, spectral computed tomography projection data showing the stent graft location at a third time, wherein the spectral computed tomography projection data correspond to at least three different energy spectra, and
• a reconstruction unit for reconstructing, based on the acquired spectral computed tomography projection data, a first computed tomography image showing the first contrast agent at the stent graft location, a second computed tomography image showing the second contrast agent at the stent graft location and a third computed tomography image showing the stent graft and tissue of the person at the stent graft location without the first and second contrast agents.