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PET-POSITRON ANNIHILATION

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PET-POSITRON ANNIHILATION

1. A positron (β + ) is the antiparticle of an electron - same mass but opposite charge.
2. Positrons do not exist long in our universe after creation.
3. Typically travel for ~2mm before they annihilate with an electron.
4. Annihilation causes destruction of the positron and the electron and the release of two 511 keV gamma photons in (nearly) opposite (180°) directions.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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