4.0 Study Procedures All participants eligible for inclusion will be identified and asked to enroll with a goal of 50 participants. All Individuals will have already had an initial cardiac PET stress test (PET 1) followed by mechanical revascularization as part of their routine medical care. Enrolled participants will then be asked to perform a second cardiac PET stress test (PET 2) within 12 weeks of their revascularization procedure(s). The stress agents, radiotracer and protocol of PET 1 and PET 2 will be identical and have been described in previous studies.