Chapter 6 Test

Question 1

In digital imaging, mAs selection has an effect on:
1.) receptor exposure
2.) patient dose
3.) brightness

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

Answer 1

d.) 1 and 2 only

Question 2

All of the following are related to spatial resolution except:

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

Answer 2

a.) milliamperage

Question 3

Dropped pixels are caused by:

a.) nonfunctioning detector elements
b.) electronic interference
c.) double exposure
d.) histogram errors

Answer 3

a.) nonfunctioning detector elements

Question 4

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

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

Answer 4

c.) excessive receptor exposure

Question 5

The greatest contributing factor in the production of scatter radiation is:

a.) patient thickness
b.) kvp
c.) patient position
d.) mas

Answer 5

a.) patient thickness

Question 6

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

Answer 6

1 and 2 only

Question 7

The corduroy effect is caused by:

a.) increased sensitivity to radiation
b.) background radiation
c.) printer malfunction
d.) double exposing the IR

Answer 7

c.) printer malfunction

Question 8

Dirt/debris would be a ____________ artifact.

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

Answer 8

a.) image receptor

Question 9

As collimation increases, the quantity of scatter radiation decreases.

a.) true
b.) false

Answer 9

a.) true

Question 10

Foreshortening can be caused by:

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

Answer 10

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

Question 11

Calculate the causal repeat rate for positioning: 1200 total images were taken, 75 repeats, 30 repeats for positioning.

Answer 11

40%

Question 12

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

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

Answer 12

b.) image contrast

Question 13

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

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

Answer 13

a.) has high contrast

Question 14

When critiquing an image, it is determined that there is a photographic property error. What would be the next step in evaluating the image?

a.) determining if the error is kvp or mas
b.) determining if the error is distortion or magnification
c.) determining if it is an equipment malfunction
d.) determining if it is a patient error

Answer 14

a.) determining if the error is kvp or mas

Question 15

The appearance of quantam mottle on a radiographic image is caused by:

a.) inadequate receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure

Answer 15

a.) inadequate receptor exposure

Question 16

If a processor error misrepresents the areas on an image (light is dark/dark is lighter) this is called:

a.) excessive equalization
b.) quantam mottle
c.) electronic noise
d.) laser printer error

Answer 16

a.) excessive equalization

Question 17

A tech is using a variable mas technique chart for a certain mobile exam. The chart calls for 12 mas by the tech uses 1.5 mas. The resulting image will likely demonstrate:

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

Answer 17

c.) quantam mottle artifact

Question 18

The appearance of saturation on a radiographic image is caused by:

a.) inadequte receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure

Answer 18

d.) excessive receptor exposure

Question 19

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 demonstrate:

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

Answer 19

a.) no visible errors

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

Phantom artifacts can occur due to:

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

Answer 21

b.) not erasing the IR

Question 22

Increasing atomic number ____________ beam attenuation and _____________ transmission.

a.) decrease, decrease
b.) increase, decrease
c.) increase, increase
d.) decrease, increase

Answer 22

b.) increase, decrease

Question 23

Low kvp produces ____________ contrast images while high kvp produces _____________ contrast images.

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

Answer 23

a.) high; low

Question 24

How is the primary beam affected when increasing the tube filtration?

a.) increase in the proportion of lower energy x rays
b.) increase in the speed of the xray photons
c.) increase in the number of xray photons
d.) increase in the proportion of higher energy x rays

Answer 24

d.) increase in the proportion of higher energy x rays

Question 25

Which of the following groups properly identifies the relationship between kvp, scattered radiation and contrast?

a.) low kvp, long scale contrast, increased scatter
b.) high kvp, long scale contrast, decreased scatter
c.) low kvp, short scale contrast, decreased scatter
d.) high kvp, short scale contrast, increased scatter

Answer 25

c.) low kvp, short scale contrast, decreased scatter

Question 26

Calculate the total image rate: 1500 total images, 220 repeats, 50 repeats were for positioning, 20 were for technical factors.

Answer 26

14.6%

Question 27

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 125 kvp. The resulting image will likely demonstrate:

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

Answer 27

d.) saturation artifact

Question 28

What type of relationship does mAs have with exposure reaching the IR?

a.) direct proportional
b.) direct
c.) inverse
d.) inverse proportional

Answer 28

a.) direct proportional

Question 29

A tech is using a variable mAs technique chart for a certain mobile exam. The chart calls for 1.5 mAs but the tech uses 2 mAs. The resulting image will likely demonstrate:

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

Answer 29

c.) no visible errors

Question 30

Increasing collimation results in:

a.) increased scatter production and high contrast
b.) increased scatter production and lower contrast
c.) decreased scatter production and lower contrast
d.) decreased scatter production and higher contrast

Answer 30

d.) decreased scatter production and higher contrast

Question 31

Decreasing tissue thickness will result in _____________ photon transmission and ____________ photon attenutation.

a.) increased, increased
b.) increased, decreased
c.) decreased, increased
d.) decreased, decreased

Answer 31

b.) increases, decreased

Question 32

A large matrix will offer what type of spatial resolution?

a.) less
b.) greater
c.) matrices have no affect on spatial resolution

Answer 32

b.) greater

Question 33

Which of the following changes will increase the amount of distortion appearing on a radiographic image?
1.) use of large focal spot
2.) tube angulations other than perpendicular to the part aligned paralle to the film
3.) increased OID

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

Answer 33

b.) 2 and 3

Question 34

Elongation of part in relationship to the resulting radiographic image occurs when:

a.) the central ray is perpendicular to the image receptor but the part does not parallel the IR
b.) the central ray is not perpendicular to the image receptor but the part parallels the IR
c.) the central ray is perpendicular to the image receptor and part parallels the IR
d.) none of these

Answer 34

b.) the central ray is not perpendicular to the image receptor bu the part parallels the IR

Question 35

What term is used when referring to noise on an image?

a.) quantam mottle
b.) acoustic noise
c.) visible noise
d.) fog

Answer 35

a.) quantam mottle

Question 36

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

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

Answer 36

b.) 1, 2 and 3

Question 37

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

Answer 37

b.) submit the radiograph as is

Question 38

Saturation indicates:

a.) fog
b.) overexposure of the IR
c.) quantam mottle
d.) underexposure of the IR

Answer 38

b.) overexposure of the IR

Question 39

Which of the following are considered image plate artifacts? (Choose all that apply.)

a.) background radiation
b.) phantom image
c.) backscatter
d.) shading

Answer 39

a.) background radiation
b.) phantom image
c.) backscatter

Question 40

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

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

Answer 40

a.) hyperdense artifact

Question 41

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

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

Answer 41

a.) size distortion

Question 42

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

Answer 42

7.5%

Question 43

SID affects both spatial resolution and image distoriton.

a.) true
b.) false

Answer 43

a.) true

Question 44

Why do double exposure artifacts occur in DR?

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

Answer 44

c.) images are taken rapidly too close together

Question 45

Any radiographer can perform which of the following tests?

a.) noninvasive, simple
b.) noninvasive, complex
c.) invasive, complex
d.) invasive, simple

Answer 45

a.) noninvasive, simple

Question 46

The primary exposure factor that is used for the penetration during a radiographic exposure is:

a.) SID
b.) KVP
c.) focal spot size
d.) mas

Answer 46

b.) kvp

Question 47

Limiting scatter radiation does not improve image contrast.

a.) true
b.) false

Answer 47

b.) false