22758011
Description
Question 1
Question
Image noise can be decreased during dedicated PET imaging by:
Answer
-
decreasing the distance between the patient and the detectors
-
using 3D mode
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decreasing the dosage activity
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scanning for a longer time
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using 4D mode
Question 2
Question
The total combined activity of the two annihilation photons originating from an annihilation reaction is:
Answer
-
500 keV
-
1.02 MeV
-
1 MeV
-
511 keV
-
2.04 MeV
Question 3
Question
The path between two detectors in PET is referred to as the:
Answer
-
line of origination
-
line of action
-
line of flight
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line of response
-
line of correction
Question 4
Question
The chance detection of photons from unrelated annihilation events within the coincidence timing window is called a ______ coincidence.
Answer
-
true
-
scatter
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prompt
-
random
-
delayed
Question 5
Question
A blank scan is performed in PET:
Answer
-
hourly
-
monthly
-
weekly
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with every patient study
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daily
Question 6
Question
Upon performing a blank scan, your final sinogram image looks like this. What is the most likely explanation?
Image:
Pet (binary/octet-stream)
Answer
-
perfect blank scan
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high voltage fluctuation
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detector malfunction
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unexplained phenomenon
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artifact in the field of view
Question 7
Question
What type of QC is performed in PET to provide accurate transmission scan data for attenuation correction of images?
Answer
-
coincidence timing calibration
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energy window calibration
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normalization calibration
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blank scan
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absolute activity calibration
Question 8
Question
When a high activity radionuclide is used in a PET scan, what is the reason for image degradation?
Answer
-
attenuation increases
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coincident pairs decrease
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deadtime decreases
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noise increases
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random events increase
Question 9
Question
A pair of annihilation photons striking two detectors at the same time is termed a:
Answer
-
random count
-
positron interaction
-
annihilation count
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true count
-
scatter count
Question 10
Question
A technologist acquires this PET scan. Which of the following should the technologist do next?
Image:
Pet2 (binary/octet-stream)
Answer
-
Submit the images for reporting
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Re-acquire the images
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Apply attenuation correction to the images
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Apply background correction to the images
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Filter out high frequency noise using iterative reconstruction
Question 11
Question
It is not unusual for detected PET coincidence events to be slightly mispositioned. This mispositioning cannot easily be corrected for and is caused by:
Answer
-
noncolinearity of the annihilation photons
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use of high activities
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use of an insufficient number of bed positions
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the energy resolution of the BGO detector
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attenuation
Question 12
Question
Scatter coincidences are most problematic with which type of detector?
Answer
-
LSO
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NaI(Tl)
-
BGO
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LYSO
-
GSO
Question 13
Question
Which of the following is NOT a factor that affects spatial resolution in PET/CT imaging?
Answer
-
detector size
-
crystal size
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location of an object in the transaxial plane
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distance of an object from the detector
Question 14
Question
Which of she following shielding materials is better to use for PET agents than lead?
Answer
-
air
-
aluminium
-
copper
-
silver
-
tungsten
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