NMTCB-PET boards prep UPDATED ACTUAL Questions and CORRECT
Answers
What PET scintillation crystal is used most? BGO
How is PET spatial resolution determined? by size of crystals and their separation
2 annihilation photons from a single annihilation interac-
What is a true coincidence event?
tion striking 2 detectors at the same time
What is a random coincidence event? 2 atoms from 2 different annihilation events
Which matrix is the most commonly used imaging matrix
128x128
in PET?
Which matrix is most commonly used for PET QC? 256x256
In PET/CT, what is the CT component used for? anatomical correlation and attenuation correction
SUV standard uptake value
What is SUV used for? Quantifying physiologic process
Above what value is physiology considered malignant? 2.0 cps/voxel
What is the most commonly used radionuclide for PET
F18-FDG
imaging?
3D imaging does not used "septa" to reduce image
electronic collimation
noise-- what is used instead?
Positron Positively charged electron
What is the proton/neutron ration for a positron emitter? proton rich, neutron poor
If each PET positron emitter gives off a different positron
Larger range = slight mis-positioning of annihilation event
energy, and the higher the energy the greater the mean
which decreases image resolution
range of travel, what happens to image resolution?
What is the half-life (T1/2) for F18-FDG? 110 minutes
What is the half-life of C-11? 20.4 minutes
What is the half-life of N-13? 10 minutes
What is the half-life of O-15? 2 minutes
, What is the half-life of Rb82? 76 seconds
What PET procedure is F18-FDG used for ? tumor imaging, brain imaging
A: Bone imaging *
B: Brain Imaging
What PET procedure is F18 NaF used for?
C: Lung Imaging
D: Perfusion Imaging
What PET procedure is C-11 used for? quantitative myocardial perfusion and prostate Ca
What PET procedure is N-13 Ammonia used for? Perfusion imaging
What PET procedure is Rb-82 Ammonia used for? MPI
What PET procedure is O-15 used for? Perfusion and Metabolic
True or False: Full ring PET scanners rotate False: only the CT component rotates
Set window used to register annihilation photons (2 an-
nihilation photons)
What is a coincidence timing window (CTW)?
It is designed to discard any event not "paired" (these are
randoms/noise)
A single, non-paired photon detected by the CTW )ran-
What is single photon elimination?
dom, scatter, etc) discarded by the CTW
A: high density with good stopping power
B: Eflcient, allowing in lots of light
What scintillator properties are most ideal for a PET scin-
C: Short decay constants
tillator?
D: Good energy resolution
E: All of the above **
Measures difference in photon arrival times in opposing
Time of Flight (TofF)
detectors
A: BGO
Which of the following are TofF scintillators? B: LSO
C: LaBr3
2/5
Answers
What PET scintillation crystal is used most? BGO
How is PET spatial resolution determined? by size of crystals and their separation
2 annihilation photons from a single annihilation interac-
What is a true coincidence event?
tion striking 2 detectors at the same time
What is a random coincidence event? 2 atoms from 2 different annihilation events
Which matrix is the most commonly used imaging matrix
128x128
in PET?
Which matrix is most commonly used for PET QC? 256x256
In PET/CT, what is the CT component used for? anatomical correlation and attenuation correction
SUV standard uptake value
What is SUV used for? Quantifying physiologic process
Above what value is physiology considered malignant? 2.0 cps/voxel
What is the most commonly used radionuclide for PET
F18-FDG
imaging?
3D imaging does not used "septa" to reduce image
electronic collimation
noise-- what is used instead?
Positron Positively charged electron
What is the proton/neutron ration for a positron emitter? proton rich, neutron poor
If each PET positron emitter gives off a different positron
Larger range = slight mis-positioning of annihilation event
energy, and the higher the energy the greater the mean
which decreases image resolution
range of travel, what happens to image resolution?
What is the half-life (T1/2) for F18-FDG? 110 minutes
What is the half-life of C-11? 20.4 minutes
What is the half-life of N-13? 10 minutes
What is the half-life of O-15? 2 minutes
, What is the half-life of Rb82? 76 seconds
What PET procedure is F18-FDG used for ? tumor imaging, brain imaging
A: Bone imaging *
B: Brain Imaging
What PET procedure is F18 NaF used for?
C: Lung Imaging
D: Perfusion Imaging
What PET procedure is C-11 used for? quantitative myocardial perfusion and prostate Ca
What PET procedure is N-13 Ammonia used for? Perfusion imaging
What PET procedure is Rb-82 Ammonia used for? MPI
What PET procedure is O-15 used for? Perfusion and Metabolic
True or False: Full ring PET scanners rotate False: only the CT component rotates
Set window used to register annihilation photons (2 an-
nihilation photons)
What is a coincidence timing window (CTW)?
It is designed to discard any event not "paired" (these are
randoms/noise)
A single, non-paired photon detected by the CTW )ran-
What is single photon elimination?
dom, scatter, etc) discarded by the CTW
A: high density with good stopping power
B: Eflcient, allowing in lots of light
What scintillator properties are most ideal for a PET scin-
C: Short decay constants
tillator?
D: Good energy resolution
E: All of the above **
Measures difference in photon arrival times in opposing
Time of Flight (TofF)
detectors
A: BGO
Which of the following are TofF scintillators? B: LSO
C: LaBr3
2/5
