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PET Radiotracers and Electron-Positron Annihilation

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PET Radiotracers and Electron-Positron Annihilation

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Questions and Answers

What is the purpose of the complicated process of correction and normalization in PET imaging?

To reduce the exposure dosage to the patient

To detect and eliminate random coincidences (correct)

To increase the number of annihilation events

To create clearer and more detailed images

Which type of event in PET imaging results from two separate annihilations with one gamma-ray from each detected within the timing window?

Random scattering

Random coincidence (correct)

Spurious coincidence

Scattered coincidence

What is the impact of scattering on PET image quality?

It degrades image quality (correct)

It enhances image clarity

It increases the specificity of the images

It reduces the exposure dosage to the patient

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 Signup and view all the answers

What aspect of radiation exposure in medical procedures is relatively low compared to exposure in natural settings?

Exposure to diagnostic CT radiation Signup and view all the answers

What facilitates the accurate quantification of radiopharmaceutical absorption in different areas in PET imaging?

Attenuation correction Signup and view all the answers

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 Signup and view all the answers

What triggers a 'true coincidence event' in PET?

Simultaneous absorption of photons in the two opposing detectors Signup and view all the answers

Why is a collimator not required for annihilation coincidence detection in PET?

The signal is considered valid only in the case of coincidence Signup and view all the answers

What time window must photons be absorbed within to be considered a 'true event' in PET?

6 to 12 nanoseconds Signup and view all the answers