Image Production practice quiz Flashcards
Which of the following factors will provide the least amount of receptor exposure?
a.) 75 kvp, 200 ma, 200 ms, 40’’ SID, large FSS, 2.5mm filtration
b.) 60 kvp, 600 ma, 0.025 s, 72” SID, small FSS, 1mm filtration
c.) 70 kvp, 600 ma, 0.25 s, 40’’ SID, small FSS, 2mm filtration
d.) 60 kvp, 300 ma, 150 ms, 72” SID, large FSS, 2mm filtration
b.) 60 kvp, 600 mA, 0.025 s, 72” SID, small FSS, 1mm filtration
What is the primary factor that influences contrast in digital imaging?
a.) KVP
b.) smoothing
c.) look up table
d.) histogram
c.) look up table
Decreased patient thickness results in:
1.) increased IR exposure
2.) increased heel effect
3.) decreased distortion
4.) higher image contrast
a.) 1 and 4 only
b.) 1, 2, 3 and 4
c.) 1 only
d.) 1, 3, and 4only
d.) 1, 3 and 4 only
Which of the following factors will provide the highest contrast?
a.) 60 kvp, 300 ma, 150 ms, 72” SID, large FSS 2mm filtration
b.) 75 kvp, 200 ma, 200 ms, 40” SID, large FSS, 2.5 mm filtration
c.) 70 kvp, 600 ma, 0.25 s, 40” SID, small FSS, 2 mm filtration
d.) 60 kvp, 600 ma, 0.025 s, 72” SID, small FSS, 1 mm filtration
d.) 60 kvp, 600 ma, 0.025 s, 72” SID, small FSS, 1mm filtration
Foreshortening can be caused by:
a.) excessive distance between the focus and the IR
b.) insufficient distance between the focus and the IR
c.) excessice distance between the object to the IR
d.) the radiographic object being placed at an angle to the IR
d.) the radiographic object being placed at an angle to the IR
Which of the following are factors that affect contrast in digital imaging?
1.) ma and or time
2.) windowing
3.) kvp
4.) pacs
5.) look up table
a.) 3 only
b.) 3 and 5 only
c.) 2, 3, 4 and 5 only
d.) all choices are responsible for image contrast
e.) 2, 3 and 5 only
e.) 2, 3 and 5 only
How does adding filtration to the xray tube assembly change the characteristcis of the xray beam?
a.) increases quantity, increases quality
b.) decreases quantity, increases quality
c.) decreases quantity, decreases quality
d.) increases quantity, decreases quality
b.) decreases quantity, increases quality
Xray beam intensity is a term describing the:
a.) frequency of photons
b.) number of photons
c.) average energy of photons
d.) maximum energy of photons
b.) number of photons
small anode target angles result in which of the following?
a.) increases heat capacity
b.) less heel effect
c.) small focal spot size
d.) better collimation
c.) small focal spot size
An image demonstrating many brightness levels or shades of gray, with only slight differences between the levels/shades is said to posses:
1.) long scale contrast
2.) low contrast
3.) short scale contrast
a.) 2 only
b.) 1 and 2 only
c.) 1 only
d.) 2 and 3 only
b.) 1 and 2 only
Which of the following contribute to subject contrast?
a.) effective atomic number
b.) differences in tissue density
c.) differences in tissue thickness
d.) all are correct
d.) all are correct
An increased focal spot size will:
1.) increase IR exposure
2.) decrease spatial resolution
3.) increase spatial resolution
4.) increase distortion
5.) decrease contrast
a.) 1 and 2 only
b.) 2 only
c.) 1, 2, 4 and 5 only
d.) 1, 2 and 3 only
b.) 2 only
Good collimation practices will do all of the following except:
a.) decrease radiation dose
b.) reduce visibility of recorded detail
c.) all options are correct
d.) affect the amount of scatter that reaches the IR
b.) reduce visibility of recorded detail
Appropriate scatter radiation control methods include which of the following?
1.) tight collimation
2.) lead masking at the edge of the exposure field
3.) appropriate use of a grid
4.) lower mA settings
5.) using an air gap method
a.) 1, 2, 3 and 5 only
b.) 1, 2 and 4 only
c.) 1, 2, 3, 4 and 5
d.) 2, 3 and 5 only
a.) 1, 2, 3 and 5 only
Increasing the anode angle will:
1.) decrease the anode heel effect
2.) increase the anode heel effect
3.) decrease IR exposure
4.) increase IR exposure
a.) 1 and 4 only
b.) 2 and 3 only
c.) 2 and 4only
d.) 1 only
a.) 1 and 4 only
mAs controls the ______________ of photons in the xray beam
a.) inertia
b.) quantity
c.) quality
d.) penetrating power
b.) quantity
Which of the following will decrease the production of scatter
a.) decreasing FOV
b.) increasing FOV
c.) increasing grid ratio
d.) decreasing mAs
a.) decreasing FOV
Which of the following matrices would produce the greatest spatial resolution?
a.) 3076 x3076
b.) 2048 x 2048
c.) 248 x 248
d.) 1024 x 1024
a.) 3076 x 3076
Saturation indicates:
a.) quantam mottle
b.) underexposure to the IR
c.) overexposure to the IR
d.) fog
c.) overexposure to the IR
The primary cause of scatter radiation that strikes the IR is from:
a.) grid cut off
b.) excessive collimation
c.) the patient
d.) photoelectric interactions
c.) the patient
If there were no contrast in a radiograph, the image would include:
a.) light gray and dark gray
b.) only the same shade of gray
c.) black and white
d.) black and light gray
b.) only the same shade of gray
All of the following are related to spatial resolution except:
a.) milliamperage
b.) OID
c.) SID
d.) focal spot size
a.) milliamperage
In radiography of a large abdomen, which of the following is/are effective ways to minimize the amount of scattered radiation reaching the IR?
1.) close collimation
2.) use of low mas
3.) removing the grid
a.) 1 only
b.) 1 and 2
c.) 1 and 3
d.) 1, 2 and 3
a.) 1 only
According to the NCRP regulations, leakage radiation from the xray tube must not exceed:
a.) 1.0 mgy/h (100 mr/h
b.) 0.1 mgy/h (10 mr/h)
c.) 1.0 mgy/min (100 mr/min)
d.) 0.1 mgy/min (10mr/min)
a.) 1.0 mgy/h (100 mr/h)
Which of the following combinations would result in an image with the least amount of magnification?
a.) increased OID and increased SID
b.) increased OID and decreased SID
c.) decreased OID and decreased source to image receptor distance (SID)
d.) decreased OID and increased SID
d.) decreased OID and increased SID
Which of the following exposure factors controls the energy of the xray beam?
a.) kvp
b.) exposure time
c.) mas
d.) filtration
a.) kvp
Decreasing mas will:
a.) decrease IR exposure
b.) decrease spatial resolution
c.) increase contrast
d.) increase IR exposure
a.) decrease IR exposure
An increase in the iamge size of an object compared with its true or actual size is called:
a.) sharpness distortion
b.) size distortion
c.) minification
d.) shape distortion
b.) size distortion
Shape distortion is caused by:
a.) angling the patient
b.) increasing the OID
c.) all choices cause shape distortion
d.) angling the tube and angling the patient
e.) angling the xray tube
d.) angling the tube and angling the patient
The passage of radiation through matter without interactions is describes as:
a.) attenuation
b.) transmission
c.) absorption
d.) scatter
b.) transmission
Which of the following factors affect image contrast? choose all that apply
a.) mas
b.) collimation
c.) focal spot size
d.) OID
e.) kvp
f.) patient factors
g.) scatter
h.) motion
I.) grid ratio
j.) anode heel effect
b.) collimation
d.) OID
e.) kvp
f.) patient factors
g.) scatter
i.) grid ratio
Scatter radiation reduces radiographic quality by changing:
a.) optical density
b.) contrast
c.) distoriton
d.) blurring
b.) contrast
Which of the following is not a type of beam limiting restrictor?
a.) cylinder
b.) PBL
c.) aperture diaphragm
d.) lead sheild
d.) lead sheild
Put the following items in order from what occurs 1st to what occurs last:
1.) primary beam
2.) attenuation
3.) remnant beam
4.) latent image
5.) manifest image
1.) primary beam
2.) attenuation
3.) remnant beam
4.) latent image
5.) manifest image
Exposure factors of 90 kvp and 17 mas are used for a particular nongrid exposure. What should be the new mas value if a 12:1 grid is added?
a.) 85
b.) 15
c.) 12
d.) 9
a.) 85
How does an increase of 25 mas to 50 mas affect xray beam quality?
a.) decreases quality
b.) it has no effect
c.) it depends on the focal spot size
d.) increases quality
b.) it has no effect
Misalignment of the tube part IR relationship results in:
a.) magnification
b.) blur
c.) size distortion
d.) shape distortion
d.) shape distortion
Which of the following factors have an affect on image receptor exposure?
a.) SID
b.) patient factors
c.) tube, ir and or patient angle
d.) kvp
e.) filtration
f.) motion
g.) focal spot size
h.) mas
a.) SID
b.) patient factors
d.) kvp
e.) filtration
h.) mas
the main purpose of a grid it to absorb scatter, and decrease patient dose.
a.) true
b.) false
b.) false
As mas increases, quality:
a.) is unaffected
b.) decreases
c.) increases by a factor of 4
d.) increases
a.) is unaffected
What are the effects of scattered radiation on a radiographic image?
1.) it produces radiographic fog
2.) decreased image contrast
3.) it produces quantam mottle
a.) 1 only
b.) 2 only
c.) 1, 2 and 3
d.) 1 and 2 only
d.) 1 and 2 only
The heel effect occurs because of:
a.) the shape charge effect
b.) the shape of the filament
c.) xray absorption in the anode
d.) reduced tube current
e.) a focusing cup
c.) xray absorption in the anode
Compared with a low ratio grid, a high ratio grid will:
1.) allow more centering latitude
2.) absorb more scattered radiation
3.) absorb more primary radiaiton
a.) 1 and 2
b.) 1, 2 and 3
c.) 2 and 3
d.) 1 only
c.) 2 and 3
Decreasing beam restriction has no effect on patient dose:
a.) true
b.) false
b.) false
As kvp increases, scatter radiation will:
a.) increase because of more compton interaction
b.) remain unchanged
c.) decrease because of less photoelectric interaction
d.) decrease because of less compton interactions
a.) increase because of more compton interaction
a measure of the ability of a system to display contrast of anatomic objects varying in size describes.
a.) DQE
b.) FOV
c.) MTF
d.) OID
c.) MTF
Aluminum filtration has its greatest effect on:
a.) low energy xray photons
b.) high energy scattered photons
c.) high energy xray photons
d.) low energy scattered photons
a.) low energy xray photons
What is a digital process that adjusts the original histogram of an image to match the expected histogram?
a.) rescaling
b.) edge enhancement
c.) smoothing
d.) DICOM
a.) rescaling
A decrease in kilovoltage will result in:
1.) a decrease in image resolution
2.) a decrease in photon energy
3.) a decrease in receptor exposure
a.) 1 and 2 only
b.) 1 only
c.) 1, 2 and 3
d.) 2 and 3 only
d.) 2 and 3 only
The greatest detail sharpness is obtained by using:
1.) a small focal spot
2.) the longest SID
3.) the smallest OID
4.) longer exposure times
a.) 1, 2, 3 and 4
b.) 4 only
c.) 1, 2 and 3
d.) 1 only
c.) 1, 2 and 3
