Chapter 3 Quiz Flashcards
The high-energy positron defines the average distance between the decaying atom and the point of annihilation. Which PET radionuclide creates the blurriest image due to this phenomenon?
F-18
C-11
Rb-82
N-13
Rb-82
Annihilation photons do not travel at exactly 180 degrees apart. This effect is described by the term ________.
-annihilation variance
-noncolinearity
-nuclear momentum
-transaxial variation
noncolinearity
Which process enhances the sensitivity of radiation detection in a GM detector?
-ionization followed by electron signal detection
-secondary ionization and electron signal detection
-photon avalanche followed by the photomultiplier
-ionization, secondary ionization, and avalanche photodiode.
ionization, secondary ionization, and avalanche photodiode
The near-simultaneous decay of 2 different atoms and the detection of 1 annihilation photon from each contribute to the collection of which type of event?
true
scatter
random
annihilation pair LOR
random
Which of the following crystals has a light emission time that is fast enough to be used in ToF systems?
-NaI(Tl)
-BGO
-GSO
-LSO
LSO
All of the following are example of gas detectors EXCEPT _______.
-dose calibrator
-well counter
-GM detector
-pocket dosimeter
well counter
Which PET scintillation detector has the slowest decay time and the worst light output?
-GSO
-LYSO
-LSO
-BGO
BGO
In which region of the characteristic curve for gas detectors does the dose calibrator function?
-ionization
-recombination
-GM
-proportional
ionization
What is the calculated disintegrations per minute of a source of radiation that measures 1300 cpm in a well counter that has 50% efficiency?
650 dpm
2600 dpm
1300 dpm
65000 dpm
2600 dpm
Which of the following is NOT a name for LORs that are experienced in PET?
-true
-false
-random
-scatter
false
