PET CT Scan (Positron Emission Tomography) or PET is a kind of a procedure which involves the use of small amount of radioactive materials called radiotracers, a computer and a special camera to evaluate functions of organs and tissues. What PET scan does is that it helps in detecting early onset of certain diseases by identifying body changes at the cellular level. CT Scan, on the other hand, is a kind of a procedure which makes use of special x-ray equipment to produce multiple pictures or images of the inside parts of the body. These days, almost all PET Scans are performed on instruments which are combined CT and PET scanners.
Purpose of PET CT SCAN
1. The main purpose of PET CT Scan is to detect cancer and find out if the cancer has spread in the body.
2. Another purpose of this procedure is to assess how effective a treatment plan is and whether cancer has returned after the therapy.
3. This scan also helps in determining the amount of blood that flows to the heart muscle.
4. Some other purposes of this scan include mapping normal human brain and heart function, evaluating abnormalities of the brain, finding out effects of heart attack on the areas of the heart etc.
Procedure of PET CT SCAN
1. PET CT Scan procedure makes use of radioactive materials known as radiotracers which are injected into the bloodstream or swallowed or inhaled in form of gas.
2. These materials then get accumulated into the target organ and release a small quantity of energy in gamma ray form.
3. The special cameras then detect this energy and the computer creates images or pictures that provide details on the function as well as the structure of the tissues and organs in the body.