Ch. 8 Test

Question 1

What type of radiation is used to create the useful parts of a diagnostic image?

Answer 1

exit and remnant radiation

Question 2

T/ F - Beam interactions are not affected by beam quality and quantity.

Answer 2

false

Question 2

The image contained within the imaging receptor before it is processed into the final image is called the ____ image.

Answer 2

latent

Question 2

Image formation is the result of_____ absorption.

Answer 2

differential

Question 3

What are the three form of attenuation?

Answer 3

absorption, scatter, transmission

Question 4

T/F - The primary beam is what creates digital images.

Answer 4

False

Question 5

T/F - Ionization is the process through which an atom ejects a neutron, gaining a net charge.

Answer 5

false

Question 6

In the diagnostic range, absorption occurs through a process called______.

Answer 6

photoelectric effect

Question 7

T/F - During a photoelectric event, the x-ray photon loses energy, and is able to exit the body.

Answer 7

False

Question 8

T/F -
Higher kVp = Less scatter
Lower kVp = More scatter

Answer 8

False

Question 9

T/F - The x-ray photon does not lose energy during a coherent scatter event.

Answer 9

true

Question 10

The primary beam is a ______ beam.

Answer 10

heretogenous

Question 11

During this form of attenuation, the beam passes through the body with no interaction with atomic structures.

Answer 11

transmission

Question 12

What form(s) of attenuation make up the final image

Answer 12

transmission and absorption

Question 13

Scatter causes an effect on the final image that is called _______.

Answer 13

fog

Question 14

In regards to the patient, which of the following impact beam attenuation

Answer 14

part thickness, tissue type, tissue density

Question 15

T/F - Energy level of the beam impacts attenuation.

Answer 15

true

Question 16

Beam attenuation increases roughly __% for each 4-5 cm of increased tissue thickness.

Answer 16

50%

Question 17

Thicker anatomic structures require ___ radiation.

Answer 17

more

Question 18

Tissues comprised of atoms with low atomic numbers present ____ opportunities for scatter or absorption to occur.

Answer 18

less

Question 19

This is the amount of matter per unit volume.

Answer 19

density

Question 20

_____ tissue is more dense than ____ tissue
- Air-filled, fat
- Muscle, fat
- Muscle, bone
- Air-filled, bone

Answer 20

muscle, fat

Question 21

An x-ray beam’s quality is also referred to as it’s ____

Answer 21

penetrability

Question 22

T/F - Absorption tends to occur with high energy photons.

Answer 22

false

Question 23

T/F - Remnant radiation is only the radiation that transmits through the body without energy loss.

Answer 23

false

Question 24

Absorption is responsible for the ____ color of an image

Answer 24

white

Question 25

Transmission is responsible for the ____ color of an image

Answer 25

black

Question 26

Scatter is responsible for the ____ color of an image

Answer 26

grey

Question 27

T/F - High contrast means the image has a lot of greyscale.

Answer 27

false

Question 28

T/F - Low contrast means the image is mostly black and white.

Answer 28

false

Question 29

Less than __% of the primary beam reaches the image receptor

Answer 29

5%

Question 30

Exit radiation is directly used to create the ____ image

Answer 30

latent

Question 31

T/F - Film-screen, CR, and DR all use cassette-based technology.

Answer 31

false

Question 32

This form of digital radiography uses an imaging plate that is scanned in a reader.

Answer 32

computed radiography

Question 33

In terms of dynamic range, a ____ range is preferred.

Answer 33

wide

Question 34

T/F - Because digital algorithms can correct an image that has been over-exposed, it isn't important for radiographers to be precise when selecting kVp and mAs.

Answer 34

false

Question 35

Which of these items are preferred in a digital radiography image receptor?

Answer 35

small pixel size and large matrix size

Question 36

T/F - It is best to have as small of a bit depth as possible.

Answer 36

false

Question 37

T/F - Film-screen has a much wider dynamic range than digital radiography.

Answer 37

false

Question 38

T/F - Fluoroscopy produces static images only.

Answer 38

false

Question 39

T/F - Dynamic imaging allows us to see internal structures of the body in motion.

Answer 39

true

Question 40

The x-ray tube of a fluoroscopy unit is typically ____

Answer 40

below the table top