Chapter 6 Quiz

Question 1

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

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

Answer 1

c.) decreased contrast

Question 2

Calculate the casual repeat rate for positioning: 1200 total images, 75 repeats, 30 repeats for positioning

Answer 2

40%

Question 3

Calculate the total repeat rate: 1600 total images, 120 repeats

Answer 3

7.5%

Question 4

mAs directly effects all of the following exccept:

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

Answer 4

a.) beam quality

Question 5

What does an S number singinificantly below 200 indicate of an exposure indicator?

a.) excessive receptor exposure
b.) insufficient contrats
c.) excessive contrast
d.) inadequate receptor exposure

Answer 5

a.) excessive receptor exposure

Question 6

A tech is using a variable KVP technique chart for a certain table top exam. The chart calls for 80 kvp but the tech uses 83 kvp. The resulting image will likely demonstraste:

a.) saturation artifact
b.) quantam mottle artifact
c.) no visible errors
d.) loss of contrast

Answer 6

c.) no visible errors

Question 7

Phantom artifacts can occur due to:

a.) not erasing the IR
b.) radiation fog
c.) heat
d.) backscatter

Answer 7

a.) Not erasing the IR

Question 8

As collimation increases, the quantity of scatter radiation decreases.

a.) true
b.) false

Answer 8

a.) true

Question 9

Foreshortening can be caused by:

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

Answer 9

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

Question 10

More scatter radiation exits the patient when using low KV.

a.) false
b.) true

Answer 10

a.) false

Question 11

SID affects both spatial resolution and image distortion.

a.) true
b.) false

Answer 11

a.) true

Question 12

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

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

Answer 12

d.) tube/part/film alignment
e.) patient factors
g.) OID
h.) SID

Question 13

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

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

Answer 13

a.) grid ratio
e.) KVP
f.) MAS
g.) SID

Question 14

Misalignment of the tube part IR relationship results in:

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

Answer 14

d.) shape distortion

Question 15

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

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

Answer 15

d.) has high contrast

Question 16

Why do double exposure artifacts occur in DR?

a.) the image reader malfunctioned
b.) the IR was not erased throughly
c.) backscatter
d.) Images are taken rapidly/too close together

Answer 16

d.) images are taken rapidly/too close together

Question 17

Physical damage to the structure of a CR image receptor is likely to manifest on a radiograph as:

a.) loss of spatial resoltuion
b.) geometric distortion
c.) loss of contrast
d.) hyperdense artifact

Answer 17

d.) hyperdense artifact

Question 18

Low kvp produces __________________ contrast images while high kvp produces __________ contrast images.

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

Answer 18

b.) high;low

Question 19

dirt/debris would be a _____________ artifact.

a.) plater reader
b.) operator error
c.) image receptor
d.) mishandling

Answer 19

c.) image receptor

Question 20

To prevent background radiation artifact, which of the following should be done?

a.) erase the IR plates daily
b.) do not expose the IR to heat
c.) handle the IR with care
d.) charge the IR daily

Answer 20

a.) erase the IR plates daily

Question 21

The main purpose of added filtration is to reduce:

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

Answer 21

d.) patient dose

Question 22

If a radiographic demonstrates an S number of 80 with no visible exposure errors, the tech should consider which of the following options:

a.) repeat the radiograph using a higher technique
b.) repeat the radiograph using a grid
c.) submit the radiograph as is
d.) repeat the radiograph using a lower techique

Answer 22

c.) submit the radiograph as is