
RadRev: "Exposures"
Quiz by Robert Peacock
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- Q1
What is the main contributing factor to Receptor Exposure?
kVp
mA
FSS
mAs
30s - Q2
What would happen to Receptor Exposure to the I.R. if you were to increase kVp AND the field size?
nothing
make the Bucky glow
decreases
Increases
30s - Q3
What would happen to the amount of Receptor Exposure to the I.R. when imaging a patient with an additive pathology present?
decreases
increases
it reverses
nothing
30s - Q4
Which of the following DOES NOT have a relationship with Receptor Exposure?
mAs
Motion
Distance
Anode Heel Effect
30s - Q5
What would be the time, in seconds, for a technique with 80 mAs and 400 mA?
.002
.02
.2
2
60s - Q6
If you used 8 mAs with a 8:1 grid, what mAs would you use with a 16:1 grid while maintaining receptor exposure?
5.3
12
6
18
60s - Q7
What is the most common type of grid cutoff?
Off-center
Off-focus
Off-level
Upside-Down
30s - Q8
During Off-Center grid cutoff, why does the image result in an overall loss of receptor exposure to the I.R.?
The focal spot size was the wrong size
The image receptor was from another room
Incorrect technique selection
The beam divergence does not match the angles of the lead strips in the grid
30s - Q9
What material makes up a photostimuable phosphor plate and what is the activator that captures the energy?
barium fluorohalide, europium
cesium iodide, gold
gadolinium oxysulfide, amorphous silicon
amorphous selenium, europium
30s - Q10
What type of grid cutoff occurs when using an SID outside of the recommended focal range and results in a loss of receptor exposure at the periphery of the image?
Off-level
Upside-down
Off-focus
Moire Effect
30s - Q11
What causes the Moire Effect?
the grid frequency is completely different to the laser scanning frequency
the grid ratio is similar to the laser scanning frequency
the grid frequency is similar to the laser scanning frequency
Crazy fashion sense
30s - Q12
How are the crystal lattices in a PSP plate organized?
criss-cross, applesauce
Structured, columnar
turbid, structured
turbid, random
30s - Q13
In CR image acquisition, what percentage of liberated electrons get trapped in the conductive layer of a PSP cassette?
30%
50%
75%
25%
30s - Q14
What is the graphical display of the distribution of pixels values called in DR?
MTF
VOI's
origami
histogram
30s - Q15
What is the prime factor related to the Look-Up Table?
Distortion
Receptor Exposure
Spatial Res.
Contrast
30s