Chapter 4 Quiz Flashcards
Reduced spatial resolution of PET scanners at the edges of the detectors is caused by _______.
-crystal depth of interaction variation
-LOR deviation
-septa misalignment is 3D mode
-increases in randoms and scatter fraction
increases in randoms and scatter fraction
The difference in 3D versus 2D PET imaging is the use of _______.
computers
ring detectors
septa
PMTs
septa
Which PET photon interaction event takes place from different decaying atoms arriving at opposing crystals within the coincidence-timing window?
trues
single
random
scatter
random
What is the term used to describe the signal-to-noise ratio for PET scanners?
-noise equivalent count rate
-internal positron count rate
-signal-to-noise positron rate
-randoms rate
noise equivalent count rate (NECR)
Which of the following is NOT an example of an iterative reconstruction algorithm?
MLEM
OSEM
RAMLA
FBP
(FBP) filtered back projection
The partial volume effect occurs when more than 1 tissue concentration is within an individual _____.
detector
bed position
voxel
field of view
voxel (or also a pixel)
Time-of-flight PET requires scintillation detector crystals such as _________.
NaI(TI) or BGO
BGO or GSO
BGO or LSO
LSO or LYSO
LSO or LYSO
Before being applied to the PET scan for attenuation correction, the CT scan must be _______.
-transcribed to 511keV attenuation coefficient values
-aligned with 3D tomographic landmarks
-fused with mutual information coefficients
-correlated to PET fiducial landmarks
transcribed to 511keV attenuation coefficient values
To calculate a tumor SUVbw, all the following information is required EXCEPT ________.
injected FDG dose
time of FDG admin
patient weight
patient height
patient height
Time-of-flight PET ______.
-increases the number of detected events
-increases the angular sampling of the LORs
-detects more events than standard ring systems
-improves lesion-to-background ratio
improves lesion-to-background ratio
