What is a PET Scan?
A PET (Positron Emission Tomography) scan is a type of imaging test that helps visualize how your organs and tissues are functioning. It uses a radioactive tracer to create detailed images of your body's metabolism.
How Does a PET Scan Work?
A small amount of a radioactive tracer is injected into your bloodstream. This tracer travels to the areas of your body that are being examined. As the tracer decays, it emits positrons, which are detected by the PET scanner. A computer then creates images based on the data collected.
When is a PET Scan Used?
PET scans are often used to:
- Detect cancer and determine its stage
- Evaluate the effectiveness of cancer treatment
- Assess heart function
- Examine brain disorders like Alzheimer's disease
Preparing for a PET Scan
Preparation for a PET scan varies depending on the specific exam. You may need to fast for several hours before the scan. You may also be asked to avoid certain medications or activities. Your healthcare provider will give you specific instructions.
The PET Scan Procedure
During a PET scan, you will lie on a table that slides into the PET scanner. The scan is painless and usually takes about 30-60 minutes. You may be asked to remain still during the scan.
After the PET Scan
There are typically no restrictions after a PET scan. You can resume your normal activities. The radiologist will interpret the images and send a report to your health care provider.