Computer screen with 3D model of patients heart. Thallium, a radioactive tracer, is injected into a vein in the arm whlle the patient is walking on a treadmill. Immediately after exercising, special pictures of the heart are taken by a nuclear camera. The images will then be repeated one hour later, after the person has rested. Both sets of pictures are then examined and compared by the doctor who specialize in performing these tests...Thallium Stress Test measures the blood flow to the heart muscle. It can identify areas of reduced blood flow to the heart muscle. Reduced blood flow may be due to blockage of coronary artery that supplies blood to the heart.
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