Back تصوير مقطعي بالإصدار البوزيتروني Arabic Pozitron emissiya tomoqrafiyası AZ Позитронно-емисионна томография Bulgarian Tomografia per emissió de positrons Catalan Pozitronová emisní tomografie Czech Positronemissionstomografi Danish Positronen-Emissions-Tomographie German Τομογραφία εκπομπής ποζιτρονίων Greek Pozitrona emisia tomografio EO Tomografía por emisión de positrones Spanish
| Positron emission tomography | |
|---|---|
 Cardiac PET scanner |
Positron emission tomography (PET)[1] is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes, and in other physiological activities including blood flow, regional chemical composition, and absorption. Different tracers are used for various imaging purposes, depending on the target process within the body.
For example:
- Fluorodeoxyglucose ([18F]FDG or FDG) is commonly used to detect cancer;
- [18F]Sodium fluoride (Na18F) is widely used for detecting bone formation;
- Oxygen-15 (15O) is sometimes used to measure blood flow.
PET is a common imaging technique, a medical scintillography technique used in nuclear medicine. A radiopharmaceutical – a radioisotope attached to a drug – is injected into the body as a tracer. When the radiopharmaceutical undergoes beta plus decay, a positron is emitted, and when the positron interacts with an ordinary electron, the two particles annihilate and two gamma rays are emitted in opposite directions.[2] These gamma rays are detected by two gamma cameras to form a three-dimensional image.
PET scanners can incorporate a computed tomography scanner (CT) and are known as PET-CT scanners. PET scan images can be reconstructed using a CT scan performed using one scanner during the same session.
One of the disadvantages of a PET scanner is its high initial cost and ongoing operating costs.[3]
- ^ Bailey DL, Townsend DW, Valk PE, Maisy MN (2005). Positron Emission Tomography: Basic Sciences. Secaucus, NJ: Springer-Verlag. ISBN 978-1-85233-798-8.
- ^ "Nuclear Medicine". hyperphysics.phy-astr.gsu.edu. Retrieved 11 December 2022.
- ^ Carlson N (22 January 2012). Physiology of Behavior. Methods and Strategies of Research. Vol. 11th edition. Pearson. p. 151. ISBN 978-0205239399.