What is positron emission tomography?

Positron emission tomography, or PET, is a medical imaging technique that uses radioactive substances called radiotracers to visualize and measure metabolic processes and other physiological activities. By injecting a radiopharmaceutical into the bloodstream, the device detects gamma rays produced by positron-electron annihilation to create detailed multi-dimensional images. In clinical practice, PET is widely applied in neurology, psychiatry, cardiology, and cancer management.

What we know

• Positron emission tomography is a functional imaging technique that uses radiotracers to measure changes in metabolic processes and physiological activities. [3]
• When a radiopharmaceutical undergoes beta plus decay, it emits a positron that annihilates with an ordinary electron, releasing two gamma rays in opposite directions. [3]
• Brain positron emission tomography measures brain metabolism and the distribution of exogenous radiolabeled chemical agents. [2]
• PET scanners can incorporate computed tomography scanners to form PET-CT scanners, allowing images to be reconstructed from a single session. [3]

Where to go next

• a case in pointHow does brain positron emission tomography measure metabolism?
• the bigger pictureWhat is molecular imaging?
• how it workedHow do PET-CT scanners combine imaging technologies?
• compared withWhat is the difference between neuroimaging and neuroradiology?
• what followedHow are radiotracers used in clinical neurology?
• an unexpected connectionHow does molecular imaging contrast with traditional histology?Molecular imaging tracks injected synthetic or natural molecules in living patients noninvasively, contrasting directly with traditional methods that require preserved tissue samples.

Sources

• [1]Brain positron emission tomography (Wikidata Q4955834) · CC0 1.0
• [2]Brain positron emission tomography · CC BY-SA 4.0
• [3]Positron emission tomography · CC BY-SA 4.0
• [4]Molecular imaging · CC BY-SA 4.0
• [5]Neuroimaging · CC BY-SA 4.0

Your path

1. Who are the notable people named Richard Cox?
2. /What is positron emission tomography?