Angiography with a co-registered view of pressure drops according iFR readings in a coronary vessel. The DEFINE PCI study showed patients had improved outcomes and less recurrent chest pain at one year using iFR physiologic measurements combined with landmarks shown on angiographic imaging to better guide therapy. Image by Philips Healthcare
An example of a HeartFlow FFR-CT image showing the blood flow through what looked like a significant blockage on CT angiography alone, actually was not flow-limiting based on computational fluid dynamics. Use of the technology was supposed to reduce the number of diagnostic catheterizations in the FORECAST trial, but the costs of FFR-CT were not offset enough to show cost savings.