Myocardial Perfusion Imaging stress testing is usually done in Nuclear Medicine Departments or Cardiac Clinics.  They may perform the test on an outpatient or inpatient basis.  The test involves an injection of a small amount of radioactive material, which circulates in the blood stream and shows if your heart muscle is receiving adequate blood supply under stress and/or rest conditions.  The radioactive injection is a clear liquid called Myoview (Tc99m tetrofosmin for injection).  Another material that could also be used is called Thallium.