Chapter 9 & 11 Quiz

Question 1

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

Answer 1

a.) 1 and 2 only

Question 2

A measure of an imaging systems ability to accurately display small anatomic objects describes:

a.) DQE
b.) MTF
c.) OID
d.) FOV

Answer 2

b.) MTF

Question 3

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

Answer 3

c.) 1, 2 and 4

Question 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

Answer 4

b.) 2 and 3 only

Question 5

Fog seen on a radiographic image is primarily the result of:

a.) classical interactions
b.) compton interactions
c.) photoelectric interactions
d.) coherent interactions

Answer 5

b.) compton interactions

Question 6

As window level increases,

a.) brightness decreases
b.) contrast scale increases
c.) brightness increases
d.) contrast scale decreases

Answer 6

c.) brightness increases

Question 7

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

Answer 7

a.) window level adjustments chaneg the contrast of the image

Question 8

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

Answer 8

a.) 1 only

Question 9

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

Answer 9

a.) 80 kvp, 8 mas, 2’’ OID, 72’’ SID, small FSS, 5:1 grid

Question 10

Which of the following technical factors is primarily used to regulate subject contrast?

a.) mas
b.) kvp
c.) grids
d.) distance

Answer 10

b.) kvp

Question 11

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

Answer 11

d.) 8

Question 12

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

Answer 12

c.) a longer SID should be used

Question 13

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

Answer 13

a.) 1, 2, 3 and 5 only

Question 14

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

Answer 14

a.) 1, 2 and 3

Question 15

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

Answer 15

a.) air gap

Question 16

increasing mas ___________ IR exposure.

Answer 16

increases

Question 17

decreasing the anode heel effect ___________ IR exposure.

Answer 17

increases

Question 18

decreasing KVP __________ IR exposure.

Answer 18

decreases

Question 19

decreasing the anode angle _________ IR exposure.

Answer 19

decreases

Question 20

changing from an 8:1 frid to a 5:1 grid _________ IR exposure.

Answer 20

increases

Question 21

decreasing collimation _________ FOV

Answer 21

increases

Question 22

increasing collimation __________ IR exposure

Answer 22

decreases

Question 23

going from a large FSS to a small FSS ___________ IR exposure

Answer 23

does not change

Question 24

increasing SID _______________ IR exposure

Answer 24

decreases

Question 25

decreasing voluntary motion ____________IR exposure

Answer 25

does not change

Question 26

Misalignment of the tube part IR relationship results in:

a.) shape distortion
b.) size distortion
c.) blur
d.) magnification

Answer 26

a.) shape distortion

Question 27

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

Answer 27

a.) has high contrast

Question 28

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

Answer 28

a.) 1 and 2 only

Question 29

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

Answer 29

b.) low energy xray photons

Question 30

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

Answer 30

c.) increase beacuse of more compton interaction