The Weatherhead Pet Center's study aims to clarify if PET imaging is a reliable guide for determining patients needing revascularization versus medical management in cardiovascular care. Patients aged 40 and above with stable or suspected coronary artery disease will be randomized into PET guided care or standard SPECT guided care, with long-term follow-up to evaluate lifestyle modification benefits. The study emphasizes cooperation with referring physicians and provides subsidized imaging and lifestyle support to enhance patient outcomes.