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It's not he positrons that are detected, but the two same energy (0.511 MeV) photons that are produced in the process of annihilation between the positron and an electron in the tissue.
Juhan reading from a teleprompter
![PET Imaging: Introduction (Part 1) [L33]](http://i.ytimg.com/vi/tkTxNEFyO7Y/mqdefault.jpg)
![PET Imaging: Introduction (Part 1) [L33]](/img/tr.png)
It's not he positrons that are detected, but the two same energy (0.511 MeV) photons that are produced in the process of annihilation between the positron and an electron in the tissue.
Juhan reading from a teleprompter