10 Questions
What is the purpose of the complicated process of correction and normalization in PET imaging?
To detect and eliminate random coincidences
Which type of event in PET imaging results from two separate annihilations with one gamma-ray from each detected within the timing window?
Random coincidence
What is the impact of scattering on PET image quality?
It degrades image quality
Which type of coincidence in PET imaging results from a single annihilation with one of the gamma-rays undergoing a small-angle Compton scatter?
Scattered coincidence
What aspect of radiation exposure in medical procedures is relatively low compared to exposure in natural settings?
Exposure to diagnostic CT radiation
What facilitates the accurate quantification of radiopharmaceutical absorption in different areas in PET imaging?
Attenuation correction
What is the result of the collision between an electron and a positron at low energies?
Annihilation of the electron and positron, and the creation of energetic photons
What triggers a 'true coincidence event' in PET?
Simultaneous absorption of photons in the two opposing detectors
Why is a collimator not required for annihilation coincidence detection in PET?
The signal is considered valid only in the case of coincidence
What time window must photons be absorbed within to be considered a 'true event' in PET?
6 to 12 nanoseconds
Test your knowledge about PET radiotracers, electron-positron annihilation, and the emission of radiation in positron-emitting tomography. Learn about the creation of energetic photons and the detected events from the decay of radiopharmaceuticals.
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