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