Positron emission tomography (PET) 1 is a nuclear drugs , purposeful imaging method that is used to watch metabolic processes in the body. The system detects pairs of gamma rays emitted not directly by a positron -emitting radionuclide ( tracer ), which is launched into the body on a biologically energetic molecule. Three-dimensional photos of tracer focus throughout the physique are then constructed by laptop evaluation. In fashionable PET-CT scanners, three dimensional imaging is often completed with the aid of a CT X-ray scan carried out on the affected person during the identical session, in the same machine.
PET imaging can present information about the biochemical function of the brain. For example, epilepsy that can’t be treated with medications is typically handled by surgical removal of the part of the mind that causes the seizures. PET scans can help this surgical procedure because it could actually present the exact a part of the brain chargeable for the individual’s epilepsy.
The test involves injecting a really small dose of a radioactive chemical, known as a radiotracer, into the vein of your arm. The tracer travels via the physique and is absorbed by the organs and tissues being studied. Next, you will be requested to lie down on a flat examination table that’s moved into the center of a PET scanner—a doughnut-like shaped machine. This machine detects and records the energy given off by the tracer substance and, with the aid of a computer, this power is transformed into three-dimensional photos. A doctor can then take a look at cross-sectional images of the physique organ from any angle as a way to detect any functional issues.
A PET scan creates photos of organs and tissues in the physique. First, a technician gives you an injection of a small quantity of a radioactive substance. Your organs and tissues decide up this substance. Areas that use more power pick up extra. Cancer cells pick up so much, because they have a tendency to use extra energy than wholesome cells. Then a scan exhibits the place the radioactive substance is in your body.