Chapter 6 Assignment

Question 1

The main purpose of a grid is to absorb scatter, and decrease patient dose.

a.) true
b.) false

Answer 1

b.) false

Question 2

Misalignment of the tube part IR relationship results in:

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

Answer 2

a.) shape distortion

Question 3

Which of the following factors affect image distortion? Choose all that apply.

a.) mAs
b.) tube/part/film alignment
c.) grids
d.) OID
e.) kvp
f.) FSS
g.) patient factors
h.) SID

Answer 3

b.) tube part film alignment
d.) OID
g.) Patient factors
h.) SID

Question 4

A large anode angle will decrease receptor exposure.

a.) true
b.) false

Answer 4

b.) false

Question 5

As collimation increases, the quantity of scatter radiation decreases.

a.) true
b.) False

Answer 5

a.) true

Question 6

The main prupose of a grid is to absorb scatter, and decreases patient dose.

a.) true
b.) false

Answer 6

b.) False

Question 7

A radiograph that has densities that are very different from each other:

a.) has low contrast
b.) has high contrast
c.) has many shades of gray
d.) has long scale contrast

Answer 7

b.) has high contrast

Question 8

The primary effect of scatter radiation on radiographic image quality is:

a.) decreased contrast
b.) decreased spatial resolution
c.) decreases brightness
d.) decreased receptor exposure

Answer 8

a.) decreased contrast

Question 9

The main purpose of added filtration is to reduce:

a.) beam penetrability
b.) patient dose
c.) beam quality
d.) the HVL

Answer 9

b.) patient dose

Question 10

The window width setting in a digital imaging system is used to manipulate which of the following values?

a.) spatial resolution
b.) image contrast
c.) temporal resolution
d.) pixel brightness

Answer 10

b.) Image contrast

Question 11

Foreshortening can be caused by:

a.) excessive distance between the object and the IR
b.) adding a CR angle to the part
c.) Insufficient distan ce beetween the focus and the IR
d.) the radiographic object being placed at an angle to the IR

Answer 11

d.) the radiographic object being placed at an angle to the IR

Question 12

All of the following are related to spatial resolution except:

a.) focal spot size
b.) milliamperage
c.) OID
d.) SID

Answer 12

b.) milliamperage

Question 13

Which of the following have an affect on image receptor exposure? Choose all that apply.

a.) FSS
b.) kvp
c.) SID
d.) motion
e.) grid ratio
f.) tube/part angle
g.) mas

Answer 13

b.) kvp
c.) SID
e.) grid ratio
g.) Mas

Question 14

low kvp = ______________ contrast, __________ scale images. (choose all)

a.) short
b.) Low
c.) high
d.) long

Answer 14

a.) short
c.) high

Question 15

Factors that can impact spatial resolution include:
1.) patient factors
2.) focal spot size
3.) SID

a.) 1, 2 and 3
b.) 1 and 2 only
c.) 2 and 3 only
d.) 1 only

Answer 15

a.) 1, 2 and 3

Question 16

The type of contrast that is caused by variations in the tissue density within the anatomic part to be imaged defines which of the following?

a.) none of the answers are correct
b.) inherent contrast
c.) image contrast
d.) subject contrast

Answer 16

d.) subject contrast

Question 17

An image demonstrating many brightness levels or shades of gray, with only slight differences between the levels/shades 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 17

a.) 1 and 2 only

Question 18

Focal spot size effects:

a.) contrast
b.) spatial resolution
c.) distortion
d.) receptor exposure

Answer 18

b.) spatial resolution

Question 19

Low kvp produces _______________ contrast images while high kvp produces ___________ contrast images.

a.) low;high
b.) high;low
c.) High;high
d.) low;low

Answer 19

b.) high;low

Question 20

An increase in the image size of an object compared with its true, or actual size, is called:

a.) minification
b.) shape distortion
c.) sharpness distortion
d.) size distortion

Answer 20

d.) size distortion

Question 21

Xrays travel at half the speed of light.

a.) true
b.) False

Answer 21

b.) false

Question 22

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.) 2 and 3
b.) 1, 2, 3 and 4
c.) 1, 2 and 3
d.) 1, 2 and 4

Answer 22

d.) 1, 2 and 4

Question 23

SID affects both spatial resolution and image distortion.

a.) true
b.) false

Answer 23

a.) true

Question 24

Mas directly affects all of the following exept:

a.) beam quanitity
b.) beam intensity
c.) beam quality
d.) xray output

Answer 24

c.) beam quality

Question 25

Which of the following factors affect image contrast? a.) mas b.) collimation c.) grid ratio d.) FSS e.) motion f.) kvp g.) anode heel effect h.) OID

Answer 25

b.) collimation c.) grid ratio f.) kvp h.) OID

Question 26

A decrease in KVP will result in: 1.) a decrease in image resolution 2.) a decrease in photon energy 3.) a decrease in receptor exposure a.) 2 and 3only b.) 1 only c.) 1, 2 and 3 d.) 1 and 2 only

Answer 26

a.) 2 and 3 only

Question 27

More scatter radiation exits the patient when using low kv. a.) true b.) false

Answer 27

b.) false

Question 28

A decreased anode angle results in an increased anode heel effect. a.) true b.) false

Answer 28

a.) true