Physics of PET and Respiratory Gating

  • April-Louise SmithEmail author
  • Richard Manber
Part of the Clinicians’ Guides to Radionuclide Hybrid Imaging book series (CGRHI)


Positron emission tomography (PET) is an imaging technique that detects radiolabelled drugs, which have been injected into the body. PET uses radioisotopes which emit energy in the form of positrons (β+). As the positron interacts with the surrounding tissue, it subsequently forms two gamma rays (γ) of equal energy (511 keV) in opposite directions. These gamma rays can then be detected by external detectors and used to produce a 3D image. A number of corrections are applied to improve image quality and respiratory gating methods can be used to correct for respiratory motion. Hybrid imaging also allows fused data for anatomical localisation and attenuation correction.


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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Institute of Nuclear MedicineUniversity College London Hospital NHS Foundation TrustLondonUK

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