Percutaneous coronary intervention (PCI) is an effective, less invasive mode of revascularization compared with coronary artery bypass grafting (CABG). In 2011, a total of 7,614 PCI procedures were performed in British Columbia (BC). While some procedures were done emergently for life-threatening indications (e.g. ST elevation myocardial infarction - STEMI or cardiogenic shock), most (6,169 cases in year 2011) were done at the discretion of the treating physicians, taking patient preference into account. A number of factors are usually considered before proceeding with PCI. These may include clinical presentation (stable angina versus acute coronary syndrome); severity of symptoms (asymptomatic or highly symptomatic); response to medical therapy; severity of ischemia based on non-invasive functional testing (mild, moderate, or severe); predicted risk (low, intermediate, or high); and findings on coronary angiography (lesion number, location, severity, and morphology, etc). However, interpretation of symptoms is subjective. Non-invasive tests for ischemia may not be reliable. In addition, coronary angiography uses 2 dimensional images to depict 3-dimensional structures, and there is well known limitations.