PET Imaging Fundamentals Quiz
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Questions and Answers

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?

    <p>Two annihilation photons from a single annihilation interaction are detected within the CTW</p> Signup and view all the answers

    What is a random coincidence?

    <p>Occurs when two single photons from two separate annihilations are detected within the CTW</p> Signup and view all the answers

    What is single coincidence?

    <p>Each annihilation photon surpassing a low energy threshold</p> Signup and view all the answers

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

    <p>&quot;Iterative Reconstruction&quot;</p> Signup and view all the answers

    What is a capacitor?

    <p>&quot;Regulates electric current&quot;</p> Signup and view all the answers

    What is a Scatter Incident?

    <p>&quot;Refers to the phenomenon where gamma rays deviate from their original trajectory after interacting with tissues in the patient's body&quot;</p> Signup and view all the answers

    What is a Single Incident?

    <p>Emission of a single gamma ray from a radiopharmaceutical within the patient's body.</p> Signup and view all the answers

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

    <p>The ability of the imaging system to detect and accurately measure the gamma rays emitted by radioactive tracers administered to a patient</p> Signup and view all the answers

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

    <p>Unwanted or random variations in the acquired data or images, coming from the patient's body</p> Signup and view all the answers

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

    <p>To create a breathable aerosol from a liquid radiopharmaceutical for inhalation by the patient</p> Signup and view all the answers

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

    <p>By using X-rays and advanced computer technology</p> Signup and view all the answers

    What are Houndsfield Units in a CT study?

    <p>Units used to express the attenuation of voxels in a CT study relative to water</p> Signup and view all the answers

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

    <p>To absorb Xenon gas during the washout phase</p> Signup and view all the answers

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

    <p>Powerful magnets and radiofrequency pulses</p> Signup and view all the answers

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

    <p>The detection of two gamma rays in separate detectors that are not associated with the annihilation event of a positron and an electron</p> Signup and view all the answers

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