Podcast
Questions and Answers
Which factor contributes to the decrease in sensitivity due to small active area receiving annihilation photons in PET?
Which factor contributes to the decrease in sensitivity due to small active area receiving annihilation photons in PET?
- Impact of ring geometry
- Decreased count rate
- Limited availability of annihilation photons (correct)
- Increased noise equivalent count rate
What is the chief benefit of time-of-flight (TOF) technology in PET?
What is the chief benefit of time-of-flight (TOF) technology in PET?
- Improved spatial resolution (correct)
- Increased count rate
- Limiting the location of the annihilation to a small part of the LOR
- Reduced scatter fraction
What does a standardized uptake value (SUV) of 1 indicate?
What does a standardized uptake value (SUV) of 1 indicate?
- Low sensitivity due to small active area
- Completely even biodistribution (correct)
- Inherent limitations of annihilation photon imaging
- High noise equivalent count rate (NECR)
How does time-of-flight (TOF) technology improve PET image quality?
How does time-of-flight (TOF) technology improve PET image quality?
What is the primary quantitative expression for count rate in PET?
What is the primary quantitative expression for count rate in PET?
What contributes to the variation in sensitivity and spatial resolution in the axial direction in 3D PET acquisition mode?
What contributes to the variation in sensitivity and spatial resolution in the axial direction in 3D PET acquisition mode?
What does a standardized uptake value (SUV) greater than 1 indicate in PET imaging?
What does a standardized uptake value (SUV) greater than 1 indicate in PET imaging?
Which characteristic of PET images results not only from the inherent variability of radioactive decay and the reconstruction process, but also from random and scatter count rates and attenuation effects?
Which characteristic of PET images results not only from the inherent variability of radioactive decay and the reconstruction process, but also from random and scatter count rates and attenuation effects?
Why is iterative reconstruction favored for PET images?
Why is iterative reconstruction favored for PET images?
What is the largest contributor to dead time in PET imaging?
What is the largest contributor to dead time in PET imaging?
What is the consequence of dead time in PET imaging?
What is the consequence of dead time in PET imaging?
Which characteristic of PET images can vary from 3 to 6 in the head and can be as high as 100 in the torso?
Which characteristic of PET images can vary from 3 to 6 in the head and can be as high as 100 in the torso?
What must be subtracted before attenuation correction is done in PET imaging to represent the radiopharmaceutical distribution correctly?
What must be subtracted before attenuation correction is done in PET imaging to represent the radiopharmaceutical distribution correctly?
What effect causes counts from a small volume to be spread out over a larger volume in the reconstructed image?
What effect causes counts from a small volume to be spread out over a larger volume in the reconstructed image?
What is the primary reason for using singles events to verify lack of coincidence in PET imaging?
What is the primary reason for using singles events to verify lack of coincidence in PET imaging?
What is the benefit of using three or more annihilation photons detected within the coincidence timing window in PET imaging?
What is the benefit of using three or more annihilation photons detected within the coincidence timing window in PET imaging?
What is the primary consequence of not correcting for attenuation in PET imaging?
What is the primary consequence of not correcting for attenuation in PET imaging?
