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A PET scan (Positron Emission Tomography) is a diagnostic imaging test that helps visualize metabolic processes in the body.
Here are some common types as below:
Preparation:
Fasting: The patient may be asked to fast for a few hours (usually 4-6 hours) before the scan, especially in the case of FDG-PET.
Medication: Patients should inform the doctor of any medications they are taking, as some may need to be paused temporarily.
Tracer Injection: The radioactive tracer is injected intravenously, and the patient waits for it to circulate through the body. The waiting period varies (usually 30-60 minutes), allowing the tracer to accumulate in the target tissues.
Scan:
The patient lies on a motorized table that moves slowly through the PET scanner, a large, cylindrical machine.
The scan itself typically lasts between 20 to 60 minutes, depending on the area of the body being imaged.
The patient needs to remain still to ensure clear images, and sometimes, additional CT or MRI scans are performed in conjunction for more detailed imaging (PET-CT or PET-MRI).
Post-Scan:
After the scan, patients are advised to drink plenty of water to help flush the tracer out of the body.
Results are interpreted by a radiologist or nuclear medicine specialist, who looks for areas of abnormal metabolic activity.