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Chapter 14: Coincidence Imaging Concepts

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Chapter 14: Coincidence Imaging Concepts

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Questions and Answers

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?

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?

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?

511 keV Signup and view all the answers

What is the main characteristic of scintillation materials used for coincidence imaging?

High efficiency in detecting lower energy photons Signup and view all the answers

What happens to the location of annihilation compared to the location of positron emission?

The locations are slightly different Signup and view all the answers

Which scintillation crystal has the highest detection efficiency but also has a long decay time and low scintillation light yield?

BGO Signup and view all the answers

What is a sinogram in the context of imaging?

An image created by stacking different pixel rows from each projection Signup and view all the answers

Which type of coincidence occurs when two single photons from two separate annihilations are detected within the coincidence timing window?

Random coincidence Signup and view all the answers

Why is attenuation more of a problem in PET than in SPECT?

Due to the requirement that both annihilation photons be detected Signup and view all the answers

What is the primary purpose of Time of Flight PET?

To improve spatial resolution of the reconstructed image Signup and view all the answers

Why is PET considered more quantitative than SPECT?

It requires determination of a calibration factor correlating count density with activity concentration Signup and view all the answers

Which scintillation crystal has low detection efficiency for 511 keV photons?