Chapter 9 & 11 Quiz Flashcards
An image demonstrating many brightness levels, or shades of gray is said to possess:
1.) long scale contrast
2.) low contrast
3.) short scale contrast
a.) 1 and 2 only
b.) 1 only
c.) 2 and 3 only
d.) 2 only
a.) 1 and 2 only
A measure of an imaging systems ability to accurately display small anatomic objects describes:
a.) DQE
b.) MTF
c.) OID
d.) FOV
b.) MTF
Minimizing size distortion is accomplished by which of the following?
1.) using the longest feasible SID
2.) using the shortest possible OID
3.) decreasing the angle of the CR
4.) placing the part as close to the IR as possible
a.) 1, 2 and 3
b.) 1, 2, 3 and 4
c.) 1, 2 and 4
d.) 2 and 3
c.) 1, 2 and 4
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, 2 and 3
b.) 2 and 3 only
c.) 1 and 2 only
d.) 1 only
b.) 2 and 3 only
Fog seen on a radiographic image is primarily the result of:
a.) classical interactions
b.) compton interactions
c.) photoelectric interactions
d.) coherent interactions
b.) compton interactions
As window level increases,
a.) brightness decreases
b.) contrast scale increases
c.) brightness increases
d.) contrast scale decreases
c.) brightness increases
All of the following are true about windowing except:
a.) window level adjustments change the contrast of the image
b.) windowing occurs after the image is displayed on a monitor
c.) saving adjusted windowing settings to the PACS narrows the visible range for future viewers
d.) windowing is referred to as a post processing manipulation procedure
a.) window level adjustments chaneg the contrast of the image
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.) use of close collimation
2.) use of low MAS
3.) use of a low ratio grid compared to a high ratio grid
a.) 1 only
b.) 1 and 2
c.) 1 and 3
d.) 1, 2 and 3
a.) 1 only
Out of the following factors, which set will provide the greatest amount of spatial resolution?
a.) 80 kvp, 8 mas, 2’’ OID, 72’’ SID, small FSS, 5:1 grid
b.) 60 kvp, 10 mas, 6’’ OID, 72’’ SID, small FSS, 8:1 grid
c.) 60 kvp, 20 mas, 10’’ OID, 72’’ SID , large FSS, no grid
d.) 80 kvp, 10 mas, 3’’ OID, 40’’ SID, large FSS, 8:1 grid
a.) 80 kvp, 8 mas, 2’’ OID, 72’’ SID, small FSS, 5:1 grid
Which of the following technical factors is primarily used to regulate subject contrast?
a.) mas
b.) kvp
c.) grids
d.) distance
b.) kvp
A particular radiograph was produced using 12 MAS and 85 KVP with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 grid ratio. what should be the new mas?
a.) 6
b.) 10
c.) 3
d.) 8
d.) 8
If the radiographer is unable to acheive a short OID because of the strcuture of the body part or patient condition, which of the following adjustments can be made to minimize magnification distortion?
a.) a smaller focal spot size should be used
b.) a shorter SID should be used
c.) a longer SID should be used
d.) a lower ratio grid should be used
c.) a longer SID should be used
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.) increasing FOV
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
Factors that can impact spatial resolution of an image include:
1.) patient factors
2.) focal spot size
3.) SID
a.) 1, 2 and 3
b.) 1 and 2 only
c.) 1 only
d.) 2 and 3 only
a.) 1, 2 and 3
If a grid is not available, what other method could help reduce excessive scatter to the IR?
a.) air gap
b.) shortening SID
c.) increasing KVP
d.) shortening SOD
a.) air gap
increasing mas ___________ IR exposure.
increases
decreasing the anode heel effect ___________ IR exposure.
increases
decreasing KVP __________ IR exposure.
decreases
decreasing the anode angle _________ IR exposure.
decreases
changing from an 8:1 frid to a 5:1 grid _________ IR exposure.
increases
decreasing collimation _________ FOV
increases
increasing collimation __________ IR exposure
decreases
going from a large FSS to a small FSS ___________ IR exposure
does not change
increasing SID _______________ IR exposure
decreases
decreasing voluntary motion ____________IR exposure
does not change
Misalignment of the tube part IR relationship results in:
a.) shape distortion
b.) size distortion
c.) blur
d.) magnification
a.) shape distortion
A radiograph that has densities that are very different from each other
a.) has high contrast
b.) has many shade of gray
c.) has low contrast
d.) has long scale contrast
a.) has high contrast
Methods that help to reduce the production of scattered radiation include using:
1.) decresing FOV
2.) beam restriciton
3.) a grid
a.) 1 and 2 only
b.) 2 and 3 only
c.) 1, 2 and 3
d.) 1 and 3 only
a.) 1 and 2 only
Aluminum filtration has its greatest effect on:
a.) low energy scatted photon
b.) low energy xray photons
c.) high energy xray photons
d.) high energy scatted photons
b.) low energy xray photons
As kvp increases, scatter radiation will:
a.) decrease because of less photoelectric interaction
b.) remain unchanged
c.) increase because of more compton interaction
d.) decrease beacuase of less compton interactions
c.) increase beacuse of more compton interaction
