Questions and Answers
What is the essential concept of coincidence imaging?
Detection of two annihilation photons in opposed detectors within a short timing window
What happens to the annihilation photons that are not in coincidence during the process of coincidence imaging?
They are discarded
What are the positron-emitting radionuclides used for coincidence imaging?
F-18, C-11, O-15, N-13, Rb-82
What is the characteristic energy of annihilation photons?
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What is the main characteristic of scintillation materials used for coincidence imaging?
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What happens to the location of annihilation compared to the location of positron emission?
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Which scintillation crystal has the highest detection efficiency but also has a long decay time and low scintillation light yield?
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What is a sinogram in the context of imaging?
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Which type of coincidence occurs when two single photons from two separate annihilations are detected within the coincidence timing window?
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Why is attenuation more of a problem in PET than in SPECT?
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What is the primary purpose of Time of Flight PET?
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Why is PET considered more quantitative than SPECT?
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Which scintillation crystal has low detection efficiency for 511 keV photons?
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