History of exposure values for this exposure ONLY

Modulation Transfer Function is:

a measure of the ability of an imaging system to preserve signal contrast

DICOM is.......................

Translation language for vendor images

What is a TFT (thin film transistor)?

switch that holds electrical current generated by a exposure

CMOS stands for.....?

complementary metal-oxide semiconductor

a graphic representation of x-ray exposure

silicon chips containing picture elements

deviation index (DI) compares

entrance dose to detector to industry-standard target dose

Number of bits of info in samples linking to dynamic range

silicon chips containing picture elements

CR acquires an image through:

the use of a storage phosphor plate

Exposure index is defined as:

a numerical value to indicate exposure to the detector

What is a TFT (thin film transistor)?

switch that holds electrical current generated by a exposure

a graphic representation of x-ray exposure

Which of the following refers to automatic rescaling?

Adjusting the raw data to display the proper brightness

Digital Imaging and Communications in Medicine

studbud

Digital Ch's 1-3 review

100 termsStudBud Administration30 plays

Imported from external platform

Flashcards100 cardsFPractice quizPHost liveL

Questions 100

Answers

1
An image manipulation process that fills in the background so that it is darkened is known as
Level
Collimating
Shuttering
2
TFT or FET photodiode arrays are composed of....
CeI
a-Se
none of these
silicon (a-Si)
3
Preset image annotation controls include all of the following except
position indicators.
date and time stamps.
image acquisition markers.
4
For PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate?
Focused laser light
Photomultiplier tube
Lithium crystal
Fluorescent light
5
Histogram is
History of exposure values for the entire hospital
History of exposure values for this exposure ONLY
History of exposure values for this machine
6
Sampling and quantization are 2 processes of analog to digital conversion
False
True
7
The workstation function that allows selection of preset terms or manual text input is termed image
Annotation
Lacing
Connection
8
Image level parameters control the image:
Brightness
Contrast
Density
Darkness
9
The analog to digital converter
Determines the contrast resolution of the system
Makes the electrical signal understandable to the computer
Determines the image matrix
All of the above
10
How dark or light a digital image appears on a display monitor is known as
spacial resolution
contrast resolution
density
brightness
11
The efficiency of a system to convert x-ray input signal into a useful output image is known as
Spatial resolution
Latitude
detective quantum efficiency.
12
A change in the level of the window of a digital display is related to a change in:
noise level
brightness
contrast
size distortion
13
The analog to digital converter
Determines the contrast resolution of the system
All of the above
Makes the electrical signal understandable to the computer
Determines the image matrix
14
Which value does rescaling impact?
IQR
Median
Standard Deviation
All of these
15
The shape of the histogram is anatomy specific.
True
False
16
the ability of an imaging system to demonstrate small details of an object is known as
image quality
dynamic range
contrast resolution
spacial resolution
17
Modulation Transfer Function is:
a function of exposure
the controlling factor of contrast resolution
a function of pixel density
a measure of the ability of an imaging system to preserve signal contrast
18
DICOM is.......................
Translation language for vendor images
A Hard drive
RAID system
Word processing
19
What is a TFT (thin film transistor)?
an thermolucent activator
switch that holds electrical current generated by a exposure
an array of radiosensitive electrodes
the reflective layer in an intensifying screen
20
The reflection of ambient light can be problematic with monochromatic monitors.
False
True
21
Focal spot and OID affect image sharpness _____ imaging
In both
Only in film/screen
Only in digital
22
the efficiency of a system to convert x-ray input signal into a useful output image is known as
latitude
dynamic range
spacial resolution
DQE
23
CMOS stands for.....?
complementary metal-oxide semiconductor
complementary metal-only conductor
complementary metal-oxide sensor
conductive metal-oxide semiconductor
24
What eliminates Veil glare?
Magnification
Shuttering
Collimation
Automatic rescaling
25
Automatic rescaling means that images are produced, regardless of the amount of exposure, with
Uniform contrast & density
Uniform size & shape
Variable contrast & density
26
A histogram is
another name for exposure indicator value
an examination of the chest
a report on exposure values
a graphic representation of x-ray exposure
27
the ability of a digital system to display subtle changes in shades of gray is called
image quality
spacial resolution
contrast resolution
dynamic range
28
CCD is made of
aluminium containing pixels
silicon chips containing picture elements
Iron bars with silicon chips
Charges in wells
29
deviation index (DI) compares
DQE and MTF with a reference value
entrance dose to detector to industry-standard target dose
exit dose to detector to a industry-standard target dose
entrance dose to pt. to industry standard target dose
30
What is bit depth?
Number of bits of info in samples linking to dynamic range
The amount of times a sample is taken per second
31
CCD is made of
silicon chips containing picture elements
aluminium containing pixels
Charges in wells
Iron bars with silicon chips
32
High-pass filtering is useful for enhancing:
organs and soft tissue
fine bone tissues
small structures
large bony structures.
33
CR acquires an image through:
conventional film/screen processing using a digital scanner
an electrically charged cassette
the heating of a thermoluminescent device
the use of a storage phosphor plate
34
when exposure is greater or less than what is needed to produce an image, ______ occurs.
Underexposure
Automatic rescaling
Overexposure
35
Changing the matrix and the FOV will not change the size of the pixel.
True
False
36
The process of joining two or more images into one continuous image is known as image:
lacing
stitching
annotation
connection
37
The modulation transfer function (MTF) is a measure of ________
Contrast
Resolution and Contrast
Sensitivity
Resolution
38
The number of bits per pixel is known as bit:
height
width
depth
pitch
39
Exposure index is defined as:
the difference in image brightness
the numerical values of the pixels
a numerical value to indicate exposure to the detector
the response of the IR to radiation falling on it
40
Magnification of the entire image at the workstation is termed
Enlargement
Zoom
Image intensification
Macroradiography
41
pixel bit depth is determined by
pixel size
# of pixels in a bit
# of bits per pixel
distance between pixels
42
define pixel
picture equivalent
picture elongation
picture equation
picture element
43
The wider window the width will:
decrease in illumination
shorten grayscale
lengthen grayscale
increase in brightness.
44
How dark or light a digital image appears on a display monitor is known as:
spatial resolution
density
brightness
contrast resolution
45
What is a TFT (thin film transistor)?
an array of radiosensitive electrodes
an thermolucent activator
the reflective layer in an intensifying screen
switch that holds electrical current generated by a exposure
46
A histogram is
a graphic representation of x-ray exposure
another name for exposure indicator value
a report on exposure values
an examination of the chest
47
Which of the following refers to automatic rescaling?
Converting analog to digital data
Producing a histogram of the raw data
Automatically collimating to the area of interest
Adjusting the raw data to display the proper brightness
48
IF TOO FEW PIXELS ARE SAMPLED, THE RESULT WILL BE
HIGH RESOLUTION
LOW CONTRAST
HIGH CONTRAST
LOW RESOLUTION
49
DICOM
Digital Imaging and Communications in Medicaid
Digital Images and Communications in Medicine
Digital Imaging and Communications in Medicine
Digital Imaging and Computers in Medicine
50
All of the following are components to PACs except?
multiple interfaces
independent kVp and mAs
web access
reading stations
51
What is a CCD?
I really dont know
Light sensing element
xray sensing element
sound sensing element
52
digital cassetteless
img resoultion is determd by pixel size of each data element
all are true
imges consists of pixel elements in a rectangular array
both methods use thin-flim transistor technology (TFT)
53
Exposure latitude is to conventional radiography as _______ is to DR.
subject contrast
dynamic range
54
Indirect capture DR converts absorbed x-ray energy into visible light.
False
True
55
Low-pass filtering is also known as
Evening
Masking
Smoothing
Marking
56
A bit is
is a numeral system made up of 16 symbols.
a numerical label assigned to each device.
a keyboarding term for typing.
the smallest unit of data in a computer.
57
Each digital image is formed by a matrix of?
algorithms
bytes
pixels
voxels
58
deviation index (DI) compares
DQE and MTF with a reference value
entrance dose to pt. to industry standard target dose
entrance dose to detector to industry-standard target dose
exit dose to detector to a industry-standard target dose
59
The CCD, semiconductor, or CMOS needs a ________ to convert xray photons to light?
Scintillator
Grid
Converter
Transformer
60
Deviation index is the difference between _____ and _____ expressed in logarithmic fashion.
actual exposure (KIND); target exposure (KTGT)
standard exposure (KSTD); actual exposure (KIND)
standard exposure (KSTD); target exposure (KTGT)
61
High-pass filtering is useful for enhancing:
fine bone tissues
small structures
organs and soft tissue
large bony structures
62
Amplification of the frequencies of the areas of interest is known as
Algorithm application
Edge enhancement
Center enhancement
Masking
63
A change in the level of the window of a digital display is related to a change in:
brightness
size distortion
contrast
noise level
64
CCD is made of
aluminium containing pixels
Iron bars with silicon chips
Charges in wells
silicon chips containing picture elements
65
Proper patient demographic input is the responsibility of the
Technologist
Transporter
QC manager
66
Changing the slope of the look-up table graph will increase or decrease
Contrast
Spatial resolution
Brightness
67
FAILURE OF THE READER TO FIND THE COLLIMATION EDGES OF AN IMAGE
MAY CAUSE THE IMAGE TO BE TOO BRIGHT OR DARK
WILL HAVE NO EFFECT
WILL ELEIMINATE ALL SCATTER
WILL CAUSE IMAGE CUTOFF
68
The analog to digital converter
Makes the electrical signal understandable to the computer
All of the above
Determines the image matrix
Determines the contrast resolution of the system
69
The higher the kilovoltage peak, the:
higher the frequency
lower the frequency
narrower the histogram
wider the histogram.
70
Each square in a matrix is called a
picture element.
byte.
matrix element.
71
A histogram displays the useful signal by locating
maximum signal only
maximum and minimum signal
all pixel values
minimum signal only
72
SUPPRESSING FREQUENCIES IN THE AREAS OF INTEREST IS KNOWN AS
ALGORITHM APPLICATION
MASKING
EDGE ENHANCEMENT
CENTER ENHANCEMENT
73
CMOS can be used in place of
CCD
None of the above
ADC
Gad or CsI
74
The active element in a storage phosphor is:
glutaraldehyde.
helium.
lithium.
barium fluorohalide.
75
Describes how digital detectors sample the xray exposure
pixel sample
bit depth
sampling frequency
sampling pitch
76
The longer an image is stored in the computed radiography (CR) cassette, the
More energy lost by electrons
Slower processing time
Easier the image is to process
77
THE ___ CONVERTS XRAY ENERGY DIRECTLY TO A DIGITAL ELECTRICAL SIGNAL
PHOTOMULTIPLIER
TLD
SCINTILLATOR
PHOTOCONDUCTOR
78
TFT or FET photodiode arrays are composed of....
none of these
a-Se
CeI
silicon (a-Si)
79
Window width controls the ratio of black and white, also known as
window
matrix
contrast
level
80
The improper algorithm application may result in
enhanced contrast
improved resolution
degradation of the image
repeat examinations
81
What is a CCD?
sound sensing element
xray sensing element
I really dont know
Light sensing element
82
The efficiency of a system to convert x-ray input signal into a useful output image is known as
detective quantum efficiency
spatial resolution
latitude
dynamic range
83
A look up table maps
latent images
densities
subject contrasts
grayscale values
84
Window level in digital imaging controls what image display property?
distortion
contrast
brightness
resolution
85
What detector has a TFT?
Both
Direct
Indirect
86
What is Modulation Transfer Function (MTF)?
Luminous flux
Dynamic Range
ratio of image to object; spatial resolution
Inverse square law
87
Bit depth is (multi answer)
Number of bits used to reproduce image gray levels
Total number of luminance units at pixel
Total number of gray shades available to use at each pixel
Total number of brightness levels at pixel
88
THE ___ CONVERTS XRAY ENERGY DIRECTLY TO A DIGITAL ELECTRICAL SIGNAL
PHOTOMULTIPLIER
SCINTILLATOR
PHOTOCONDUCTOR
TLD
89
Direct Digital Conversion
Changing X-Rays to light then converting that ligh to a signal using a-Si
Use of an phosphor to emit light
Changing X-Rays to an electrical signal using a phosphor like a-Si
Changing X-Rays to an electrical signal using a phosphor like a-Se
90
CCD is a layer of
crystalline silicon
cesium iodine
silver bromide
amorphous silicon
91
What is bit depth?
The amount of times a sample is taken per second
Number of bits of info in samples linking to dynamic range
92
Rescaling?
amount of exposure
the incidence that a particular exposure value has occurred.
AKA Normalization. Re-mapping brightness and grayscale of the digital image
graphical representation of numerous shades of gray within an image
93
In the quantization step, to capture an analog image to a digital image, ___.
infinite # of color shades & tones in a analog image put to discrete values
A 2D grid is put on the image & each cell on the grid's turned into a pixel
The resulting digital image file is compresed to have a smaller file size
A 2D grid is applied on the image to apply dithering to the image
94
Image level parameters control the image:
Contrast
Density
Darkness
Brightness
95
What is bit depth?
Number of bits of info in samples linking to dynamic range
The amount of times a sample is taken per second
96
CCD is a layer of
cesium iodine
amorphous silicon
crystalline silicon
silver bromide
97
Indirect Digital Conversion
Changing X-Rays to an electrical signal using a phosphor like a-Si
Use of an phosphor to emit light
Changing X-Rays to an electrical signal using a phosphor like a-Se
Changing X-Rays to light then converting that light to a signal using a-Si
98
Incorrect collimation can cause rescaling errors
False
True
99
MTF is modular transfer function
True
False
100
What is the purpose of an analog to digital converter in digital imaging?
Create transverse cross sectional images
Create numbers from electricity
Create video signals
Creat electricity from light

Digital Ch's 1-3 review Flashcards | StudBud