A PET test, or Positron Emission Tomography scan, is a type of imaging test that helps doctors see how organs and tissues are working. It uses a radioactive substance called a tracer to highlight areas of high metabolic activity, which can indicate the presence of disease. This is unlike MRI and CT scans, which primarily show the structure of organs and blood flow.
Here are some key features of a PET test:
- Metabolic activity: PET scans can detect changes in the metabolism of cells, which can be an early sign of disease.
- Real-time imaging: PET scans provide information on how organs and tissues are functioning in real-time, unlike other imaging tests.
- 3D images: PET scans create detailed, three-dimensional images of the inside of the body.
- Variety of applications: PET scans are used to diagnose and monitor a wide range of conditions, including cancer, heart disease, and neurological disorders.
For example, a PET scan can be used to:
- Detect cancer: PET scans can help doctors find cancer cells that may be too small to see on other imaging tests.
- Stage cancer: PET scans can help doctors determine the extent of cancer spread, which is important for treatment planning.
- Monitor treatment response: PET scans can help doctors assess how well cancer treatment is working.
- Evaluate heart function: PET scans can help doctors assess blood flow to the heart and identify areas of damage.
