For one..., a functional study of the human heart can be done with a nuclear stress test utilizing radiopharmaceuticals such as Cardiolite or Myoview. These tests are done with two phases. The resting phase and then the stress phase. Functional images are taken with a gamma camera during both phases which show distribution of the injected radio-tracer throughout the myocardium. These images are taken with a SPECT protocol which acquires projection views of the heart which are then recombined later into a sonogram. Horizontal Long Axis, Vertical Long Axis, and Short Axis views from both the resting and stress images are compared. Defects appearing on both the resting and stress images DO indicate a previous myocardial infarction, HOWEVER..., if a defect appears on the resting images, and DOES NOT appear on the stress images, then the patient is diagnosed with Ischemia. Can anyone guess what the main underlying cause of Ischemia is? Atherosclerosis. Build up of plaque. Therefore, the patient will more than likely be scheduled for heart catheterization if they meet certain screening issues, and the cardiologist will likely implant one or multiple stents. This determination was MADE POSSIBLE due to the diagnosis of Ischemia based on data acquired UTILIZING A NUCLEAR STRESS TEST