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PET Imaging Coincidence Events Quiz

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Questions and Answers

What is the biggest contributor to dead time in nuclear medicine imaging?

Single events (correct)

Scatter coincidence

Prompt events

True coincidence

In nuclear medicine imaging, what is a scatter coincidence?

Events where a gamma ray photon scatters within the patient body before being detected (correct)

All coincident events counted in the initial coincidence

Occurs when two single photons from two separate annihilations are detected within the CTW

Two annihilation photons from a single annihilation interaction are detected within the CTW

What is a random coincidence in nuclear medicine imaging?

Each annihilation photon surpassing a low energy threshold but not ultimately counted unless a coincident photon is detected

All coincident events counted in the initial coincidence

Events where a gamma ray photon scatters within the patient body before being detected

Occurs when two single photons from two separate annihilations are detected within the CTW (correct)

What is the role of a capacitor?

Regulates electric current (D) Signup and view all the answers

What does 'random incident' refer to in the context of gamma ray detection?

Detection of two unassociated gamma rays in separate detectors (C) Signup and view all the answers

What does 'system sensitivity' refer to in the context of imaging systems?

Ability to accurately measure the emitted gamma rays by radioactive tracers (B) Signup and view all the answers

What does 'noise' refer to in the context of acquired data or images?

Unwanted variations in the acquired data or images (A) Signup and view all the answers

How does pitch change the amount of radiation a patient is exposed to during a radiopharmaceutical procedure?

It increases the amount of radiation exposure (D) Signup and view all the answers

What are Hounsfield Units used for in a CT study?

Expressing relative attenuation assigned to voxels in a CT study (B) Signup and view all the answers

What type of imaging does Magnetic Resonance Imaging (MRI) utilize?

Powerful magnets and radiofrequency pulses (D) Signup and view all the answers

What type of imaging does Computed Tomography (CT) employ?

X-rays and advanced computer technology (B) Signup and view all the answers