What is a PET Scan?
Positron Emission Tomography (PET) scan is a non-invasive imaging technique that uses a small amount of radioactive tracer to visualise and measure changes in metabolic processes and other physiological activities in the body, particularly the brain. PET scans are crucial in mental health for identifying and monitoring brain function and detecting abnormalities related to psychiatric conditions.
How it's Performed
Preparation
- Dietary Restrictions: You may be asked to avoid eating or drinking anything except water for several hours before the scan.
- Medication: Inform your doctor about any medications you are taking as some may need to be paused.
During the Procedure
- Tracer Injection: A small amount of radioactive tracer is injected into a vein. The tracer travels through your bloodstream and is absorbed by the tissues and organs.
- Imaging Process: You will lie on a narrow table that slides into a large, circular PET scanner. The scanner detects the radiation emitted by the tracer and converts it into 3D images.
- Tasks: You may be asked to perform simple tasks or stay still, depending on the focus of the scan.
- Duration: The scan typically takes between 30 to 60 minutes, but you may need to wait for the tracer to distribute in your body before the scan starts.
Post-Procedure
- Image Analysis: The PET scan images are analysed by a radiologist. They examine the metabolic activity and other functional aspects of the brain. This analysis is compiled into a report and shared with your doctor.
Who Can Have One?
Safe for most people, including children and adults.
Contraindications
- Pregnancy: Generally avoided unless absolutely necessary due to radiation exposure.
- Breastfeeding: You may need to pump and discard breast milk for a period after the scan.