An arteriogram is an x-ray of blood vessels, which becomes visible after an injection of contrast solution into the circulation which appears on the x-ray film. Arteriograms are frequently used to evaluate suspected vascular heart disease. It is an invasive and non-benign procedure. Mortality rates are up to 1%. Studies have shown that the “percentage blockage” reported by doctors who read arteriograms is not a reproducible result, i.e. it is a gross estimate which be off by 50% or more.