How Do PET Scans Work?
PET scans (positron emission tomography scans) are a type of medical imaging test that uses a radioactive tracer to create images of the inside of the body. PET scans are used to diagnose a variety of diseases, including cancer, heart disease, and Alzheimer's disease.
How Do PET Scans Work?
1. A small amount of a radioactive tracer is injected into the body. The tracer is absorbed by cells in the body and transported to different organs and tissues.
2. The tracer emits positrons, which are small particles that have a positive charge. When a positron collides with an electron, it creates two gamma rays. These gamma rays are detected by a scanner, which creates images of the inside of the body.
3. The images created by a PET scan can be used to diagnose a variety of diseases. For example, PET scans can be used to:
- Detect cancer tumors
- Determine the extent of cancer
- Monitor the response of cancer to treatment
- Diagnose heart disease
- Diagnose Alzheimer's disease
What Are the Benefits of PET Scans?
PET scans offer a number of benefits over other types of medical imaging tests, including:
- PET scans can provide images of the inside of the body that are not visible with other types of imaging tests.
- PET scans can be used to diagnose a variety of diseases, including cancer, heart disease, and Alzheimer's disease.
- PET scans are relatively painless and non-invasive.
- PET scans are widely available.
What Are the Risks of PET Scans?
PET scans are generally safe, but there are some risks associated with the test, including:
- The radioactive tracer used in PET scans can cause side effects, such as nausea, vomiting, and diarrhea. These side effects are usually mild and go away within a few days.
- PET scans can be expensive.
- PET scans are not always covered by insurance.
How to Prepare for a PET Scan
There are a few things you can do to prepare for a PET scan, including:
- Tell your doctor about any medications you are taking, including over-the-counter medications and herbal supplements.
- Avoid eating or drinking anything for at least 4 hours before the scan.
- Wear loose, comfortable clothing to the scan.
- Arrive at the scan center 15 minutes early to complete paperwork.
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