<qa>  What is the purpose of this pilot study?The purpose of this pilot study is to test the ability of Transluminal Flow Encoding TAFE to evaluate vessel specific ischemia in patients with a clinical indication for invasive coronary angiography ICA with fractional flow reserve FFR measurements for suspected coronary disease. TAFE is a novel method that derives coronary blood flow from easily obtainable non-invasive coronary CT angiograms. 