PET Imaging Fundamentals Quiz

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What is the biggest contributor to dead time?

Scatter coincidence
Single events (correct)
Prompt events
True coincidence

What is a prompt event?

Occurs when two single photons from two separate annihilations are detected within the CTW
Events where a gamma ray photon scatters within the patient body before being detected
All coincident events counted in the initial coincidence (correct)
Two annihilation photons from a single annihilation interaction are detected within the CTW

What is scatter coincidence?

Two annihilation photons from a single annihilation interaction are detected within the CTW
Occurs when two single photons from two separate annihilations are detected within the CTW
All coincident events counted in the initial coincidence
Events where a gamma ray photon scatters within the patient body before being detected (correct)

What is true coincidence?

Two annihilation photons from a single annihilation interaction are detected within the CTW (C) Signup and view all the answers

What is a random coincidence?

Occurs when two single photons from two separate annihilations are detected within the CTW (D) Signup and view all the answers

What is single coincidence?

Each annihilation photon surpassing a low energy threshold (C) Signup and view all the answers

What uses a 2D projection to make a 3D image?

"Iterative Reconstruction" (C) Signup and view all the answers

What is a capacitor?

"Regulates electric current" (A) Signup and view all the answers

What is a Scatter Incident?

"Refers to the phenomenon where gamma rays deviate from their original trajectory after interacting with tissues in the patient's body" (B) Signup and view all the answers

What is a Single Incident?

Emission of a single gamma ray from a radiopharmaceutical within the patient's body. (D) Signup and view all the answers

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

The ability of the imaging system to detect and accurately measure the gamma rays emitted by radioactive tracers administered to a patient (A) Signup and view all the answers

What is 'noise' in the context of imaging systems, and where does it come from?

Unwanted or random variations in the acquired data or images, coming from the patient's body (A) Signup and view all the answers

What is the purpose of a nebulizer in the context of gas filled administration for imaging?

To create a breathable aerosol from a liquid radiopharmaceutical for inhalation by the patient (D) Signup and view all the answers

How does CT (Computed Tomography) create detailed images of bones, organs, and tissues?

By using X-rays and advanced computer technology (D) Signup and view all the answers

What are Houndsfield Units in a CT study?

Units used to express the attenuation of voxels in a CT study relative to water (B) Signup and view all the answers

What is the role of charcoal in gas-filled administration for imaging?

To absorb Xenon gas during the washout phase (A) Signup and view all the answers

In MRI (Magnetic Resonance Imaging), what is utilized to generate detailed images of internal structures?

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

What does 'random incident' refer to in imaging systems?

The detection of two gamma rays in separate detectors that are not associated with the annihilation event of a positron and an electron (C) Signup and view all the answers