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RAD 2555 Exam II Prep Spring 2025 Flashcards | StudBud
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RAD 2555 Exam II Prep Spring 2025
RAD 2555 Exam II Prep Spring 2025
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Questions
30
Answers
1
Total brightness gain in an image intensifier is
determined by minification gain.
all of the above.
determined by flux gain.
a measure of the increase in image intensity.
2
The input screen of an image intensifier is ____ in shape
rectilinear
oval
concave
convex
3
High contrast = short scale
False
True
4
Small matrices gives the best image detail
False
True
5
Aliasing is also referred to as
heat blur
moire effect
mottle
common artifcats
6
A standard repeat rate is generally
10-12%
4-6%
15-20%
1-2%
7
Flux gain...
improves image resolution created by output phosphor crystals
is directly related to the input phosphor conversion efficiency.
all of the above
deals with gain resulting from conversion of light at the output phosphor.
8
What is the controlling or limiting aspect of an imaging systems ability to display contrast?
LUT
bit depth
Subject ccontrast
pixel size
9
Can be caused by an improper pre-processing algorithm section
mottle
moire effect
heat blur
histogram error
10
What does this image artifact represent in a CR system?
Dead pixels
Dust on CR reader light guide
scratches
grid lines
11
Which of the following regulates fluoroscopic spot imaging exposures?
Dose area product meter
Automatic Exposure Control termination
Artificial Intelligence algorithms
Analog to digital converter
12
Window level expands or contracts the range of shades of gray (contrast)
False
True
13
Detective quantum efficiency (DQE) is a measure of which of the following?
contrast resolution
spatial resolution
image noise
x-ray absorption
14
The photocathode absorbs ____ and emits ____.
x-ray photons; light photons
light photons; x-ray photons
light photons; electrons
electrons; light photons
15
Damage to DR crystals, permanently fogs, happens in the nursery potentially
Moire effect
Histogram error
dropped pixels
Heat blur
16
can be used to measure spatial frequency or how well a system sees and object closely together
MTF Modulation Transfer function
high contrast
DQE
LUT
17
While fluoroscopy is a dynamic imaging process, spot imaging is an imaging process that:
Allows continuous viewing of dynamic anatomy
Increases the magnification of the anatomy
Saves the last image on the screen
Takes exposures of static images
18
HVL stands for_________________________, and it is a measurement of_______________________________.
Hounsfield Value Limit; Lead equivalency
Half Value Layer; filtration testing for kvp
Half Value Layer; filtration testing for mAs
Hanover variance limit; kvp accuracy
19
What connects the x-ray tube and the image receptor in mobile fluoroscopy?
C-Arm
Control panel
rotational joint
smiley face
20
Dead pixels
heat blur
phospher wear
dropped pixels
most common artifact
21
The output screen absorbs ____ and emits ____.
light photons; electrons
electrons; light photons
electrons; x-ray photons
light photons; x-ray photons
22
Blotchy appearance caused by insufficient number of x-rays covering image receptor is________________.
quantum mottle
moire effect
nyquist frequency
motion
23
What is the unit of measurement for spatial resolution/frequency?
bit depth
microns
sampling frequency
lp/mm
24
What is the limitation of the beam restriction to collimated field for allowable variance?
2% of SID
5%
1% of SID
10%
25
Which fluoroscopic procedure is demonstrated in the following image?
Urology study
Orthopedic study
Gastroenterology study
Cardiology study
26
Which component of the C-Arm system is identified by the letter (A) in the following image?
Image receptor
X-ray tube
Control panel
C-Arm
27
The input screen absorbs ____ and emits ____.
x-ray photons; light photons
x-ray photons; electrons
light photons; x-ray photons
electrons; x-ray photons
28
measurement of a systems ability to convert the amount of radiation received by a detector into a useful image.
LUT
DQE
MTF
BIT
29
In digital imaging, what is the CONTROLLING factor for image contrast?
Look up table (LUT)
Subject contrast
Exit Radiation
Pixel size
30
Spatial resolution is considered an Image Quality Factor
False
True
