Ch. 12 Test

Question 1

Scatter, in the diagnostic range, is mostly due to ____.

Answer 1

compton effect

Question 2

The two major factors that affect scatter production are ____ and ____.

Answer 2

• tissue volume
• kVp

Question 3

T/F - Lower kVp creates less scatter.

Answer 3

true

Question 4

T/F - Higher kVp creates more scatter.

Answer 4

true

Question 5

Beam restriction does these two things.

Answer 5

• limit patient dose
• reduce scatter

Question 6

T/F - Collimation and field size are directly proportional.

Answer 6

false

Question 7

Increasing collimation ____ scatter production.

Answer 7

decreases

Question 8

Increasing collimation _____ contrast.

Answer 8

increases

Question 9

T/F - A tightly collimated primary beam uses the same amount of mAs as a poorly collimated primary beam to achieve the same level of exposure.

Answer 9

false

Question 10

T/F - When increasing collimation, kVp should be increased.

Answer 10

false

Question 11

Select the item that is not a beam restricting device.
Aperture diaphragm
Cone
Collimator
All of the above
None of the above

Answer 11

none of the above

Question 12

When using a grid, the radiographer will need to increase _____.

Answer 12

mAs

Question 13

T/F - Grid use does not increase patient dose.

Answer 13

false

Question 14

A high grid ratio will clean up ____ scatter.

Answer 14

more

Question 15

_____ grids can be either long or short dimension.

Answer 15

linear

Question 16

T/F - Grid cutoff is less likely when using cross-hatched grids, due to their design.

Answer 16

false

Question 17

T/F - Focused grids can be used at any SID.

Answer 17

false

Question 18

T/F - Parallel grids can be used at any SID.

Answer 18

true

Question 19

All of these are stationary grids except for _____.
Wafer grid
Grid cassette
Grid cap
All of the above
None of the above

Answer 19

none of the above

Question 20

Reciprocating grids are _____.

Answer 20

dynamic

Question 21

When going from no grid to a 10:1 grid, you have to multiply your original mAs by ____.

Answer 21

5

Question 22

When going from no grid to a 5:1 grid, you have to multiply your original mAs by ___.

Answer 22

2

Question 23

When going from no grid to a 16:1 grid, you have to multiply your original mAs by ____.

Answer 23

6

Question 24

T/F - Off-center grid cutoff is the most common form of grid cutoff.

Answer 24

false

Question 25

T/F - Off-level grid cutoff is the most common form of grid cutoff.

Answer 25

true

Question 26

T/F - Air gap technique can be used instead of a grid, and it results in significantly less patient dose.

Answer 26

false

Question 27

T/F - Using two grids at the same time can cause Moire effect.

Answer 27

true

Question 28

Fluoroscopy is used to produce ____ images.

Answer 28

dynamic

Question 29

______ are inversely proportional.

Answer 29

S numbers

Question 30

_____ are directly proportional.

Answer 30

EI numbers

Question 31

T/F - Radiographic beam quality has no effect on beam attenuation.

Answer 31

false

Question 32

T/F - Amorphous selenium is used in direct capture DR.

Answer 32

true

Question 33

T/F - Amorphous silicon is used in direct capture DR.

Answer 33

false

Question 34

T/F - Turbid phosphor layers are columnar.

Answer 34

false

Question 35

T/F - Structured phosphor layers are columnar.

Answer 35

true