NMTCB-PET boards prep
What is a true coincidence event? - ANSWER-2 annihilation photons from a single annihilation interaction striking 2 detectors at the same time
What is a random coincidence event? - ANSWER-2 atoms from 2 different annihilation events
Which matrix is the most commonly used imaging matrix in PET? - ANSWER-128x128
Which matrix is most commonly used for PET QC? - ANSWER-256x256
In PET/CT, what is the CT component used for? - ANSWER-anatomical correlation and attenuation correction
What PET scintillation crystal is used most? - ANSWER-BGO
How is PET spatial resolution determined? - ANSWER-by size of crystals and their separation
SUV - ANSWER-standard uptake value
What is SUV used for? - ANSWER-Quantifying physiologic process
Above what value is physiology considered malignant? - ANSWER-2.0 cps/voxel
What is the most commonly used radionuclide for PET imaging? - ANSWER-F18-FDG
3D imaging does not used "septa" to reduce image noise-- what is used instead? - ANSWER-electronic collimation
Positron - ANSWER-Positively charged electron
What is the proton/neutron ration for a positron emitter? - ANSWER-proton rich, neutron poor
If each PET positron emitter gives off a different positron energy, and the higher the energy the greater the mean range of travel, what happens to image resolution? - ANSWER-Larger range = slight mis-positioning of annihilation event which decreases image resolution
What is the half-life (T1/2) for F18-FDG? - ANSWER-110 minutes 1 / 2
What is the half-life of C-11? - ANSWER-20.4 minutes
What is the half-life of N-13? - ANSWER-10 minutes
What is the half-life of O-15? - ANSWER-2 minutes
What is the half-life of Rb82? - ANSWER-76 seconds
What PET procedure is F18-FDG used for ? - ANSWER-tumor imaging, brain imaging
What PET procedure is F18 NaF used for? - ANSWER-A: Bone imaging *
B: Brain Imaging
C: Lung Imaging
D: Perfusion Imaging
What PET procedure is C-11 used for? - ANSWER-quantitative myocardial perfusion and prostate Ca
What PET procedure is N-13 Ammonia used for? - ANSWER-Perfusion imaging
What PET procedure is Rb-82 Ammonia used for? - ANSWER-MPI
What PET procedure is O-15 used for? - ANSWER-Perfusion and Metabolic
True or False: Full ring PET scanners rotate - ANSWER-False: only the CT component rotates
What is a coincidence timing window (CTW)? - ANSWER-Set window used to register annihilation photons (2 annihilation photons)
It is designed to discard any event not "paired" (these are randoms/noise)
What is single photon elimination? - ANSWER-A single, non-paired photon detected by the CTW )random, scatter, etc) discarded by the CTW
What scintillator properties are most ideal for a PET scintillator? - ANSWER-A: high density with good stopping power
B: Efficient, allowing in lots of light
C: Short decay constants
D: Good energy resolution
E: All of the above **
Time of Flight (TofF) - ANSWER-Measures difference in photon arrival times in opposing detectors
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