| Principle
of PET |
|
|
| A2
Positron and electron annihilation |
|
| and emission of gamma rays |
|
|
|
|
|
| PET
is based on the radioactive |
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| decay
of positrons from the nucleus |
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| of
the unstable atoms (15O has 8 |
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| protons and 7
neutrons) |
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| Gamma ray |
|
|
|
| Site
of positron |
||
| annihilation |
||
| (imaged
point) |
||
|
|
|
| A1 Positron emission |
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| in
the brain |
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| Electron |
|
|
|
| Gamma ray |
||
| photon |
||
| 0-9mm |
|
|
| Unstable |
|
| radionuclide |
|
| Positron |
|
|
|
| resolution |
||
| limit |
||
| From: Principles of Neural Science (4th. Ed.)
Kandel, Schwartz, & Jessell, p. 377. |
| Columbia fMRI |