PET Image Characteristics: Noise and Dead Time
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Questions and Answers

What is the chief benefit of incorporating time-of-flight (TOF) technology in PET imaging?

  • Increased sensitivity to annihilation photons
  • Enhancement of signal to noise ratio (SNR) in the reconstructed 3D image matrix (correct)
  • Reduction in noise equivalent count rate (NECR)
  • Improved spatial resolution in the axial direction

What is the most appropriate quantitative expression for count rate in PET imaging?

  • Spatial resolution
  • Dead time
  • Noise equivalent count rate (NECR) (correct)
  • Scatter fraction

What does a standardized uptake value (SUV) of 1 indicate?

  • An area of increased activity
  • Completely even biodistribution (correct)
  • High sensitivity to annihilation photons
  • Low noise equivalent count rate (NECR)

What are the factors that can affect the SUV for FDG in PET imaging?

<p>Blood sugar at the time of injection and uptake in other tissues (A)</p> Signup and view all the answers

What is the impact of ring geometry on PET imaging?

<p>Variable density of lines of response (LORs) and depth interaction effect (parallax) (C)</p> Signup and view all the answers

What is the consequence of dead time in PET imaging?

<p>Loss of true coincidence (D)</p> Signup and view all the answers

What is the impact of subtracting scatter in PET imaging?

<p>Increases noise due to decreased total counts (D)</p> Signup and view all the answers

How does attenuation correction affect PET images?

<p>Causes an increase in image noise (C)</p> Signup and view all the answers

What is the primary contributor to dead time in PET imaging?

<p>Annihilation photons within coincidence timing window (C)</p> Signup and view all the answers

How can the partial volume effect (PVE) be corrected for quantitative purposes in PET imaging?

<p>By multiplying observed activity concentration by a recovery coefficient (B)</p> Signup and view all the answers

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