PET scan images can detect cellular changes in organs and tissues earlier than CT and MRI scans. This PET image shows an area of reduced blood flow from one of the arteries that feeds the heart. PET scan, or positron emission tomography scan, is a functional imaging technique. I said that was OK and set up an appointment for the afternoon of Wednesday, September 5. It uses radioactive tracers (called radionuclides) to produce pictures of your heart. Doctors use cardiac PET scans to diagnose coronary artery disease (CAD) and damage due to a heart attack. A PET scan on the other hand is more useful in … PET scan of the heart. Infections and healing wounds are just a couple of things that light up on PET scans. Unless your doctor tells you otherwise, you can resume normal activities after a PET scan. Best Answers. Since the PET scan was fully booked for that week, they asked if the following Wednesday would be ok. That mean waiting just over a week for a PET scan. It is used in the detection of several diseases including heart disease, cancer and brain disorders. PET can measure blood flow, blood volume, oxygen usage, tissue pH (acidity), glucose (sugar) metabolism, and drug activity. For example, an abnormal growth like a tumor can be easily detected using a CT scan. The entire PET scan process takes about two hours. Preparing for your PET-CT scan. How long does a PET scan take? A variety of cancer cells become visible as bright spots in the images of PET scans. Because malignant cells grow at a fast rate, they metabolize more sugar than normal cells. A PET scan is often done in conjunction with a CT scan. Since cancer cells take in more glucose than normal cells, those spots light up on the scan. However, PET scan images are not as sharp as those produced by CT or MRI. A PET Scan (or Positron Emission Tomography) is a non-invasive, diagnostic examination that finds information about the activity of different parts of the body. A positron emission tomography (PET) scan shows images of organs and tissues and how they are functioning. A scan is then taken a couple of hours later. A lung positron emission tomography scan is an imaging test.It uses a radioactive substance (called a tracer) to look for disease in the lungs such as lung cancer.. The hospital I go to does not have a PET scan. A PET scan uses a specially created substance that the body thinks is sugar, and takes up into the cells. This information may help doctors decide whether to suggest bypass surgery or angioplasty to restore that blood flow. What is a cardiac PET scan? It can take up to 60 minutes for your body to absorb the injected radiotracer. It answers the question ‘What does it look like?’. PET scans show inflammation, infection, fractures all sorts of things. The radiotracer does not cause any side effects or pain. CT scans take a fast series of x-ray pictures. 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