scatter control

Question 1

when you increase kVp, you _________ scatter

Answer 1

increase (increase Compton interactions, lower photoelectric)

Question 2

when you increase field size, you _________ scatter

Answer 2

increase

Question 3

increased anatomy part _________ scatter

Answer 3

increases

Question 4

digital imaging is (more/less) sensitive to scatter

Answer 4

more

Question 5

patient dose will ___________ with increased collimation

Answer 5

decrease

Question 6

scatter radiation will ___________ with increased collimation

Answer 6

decrease

Question 7

radiographic contrast will ___________ with increased collimation

Answer 7

increase

Question 8

exposure to IR will ___________ with increased collimation

Answer 8

decrease

Question 9

patient dose will ___________ with increased x-ray field size

Answer 9

increase

Question 10

scatter radiation will ___________ with increased x-ray field size

Answer 10

increase

Question 11

radiographic contrast will ___________ with increased x-ray field size

Answer 11

decrease

Question 12

exposure to IR will ___________ with increased x-ray field size

Answer 12

increase

Question 13

x-ray field size and collimation are ________

Answer 13

inverse; to increase the field size you decrease collimation

Question 14

collimators are ____ shutters that sit between the ____________

Answer 14

lead, tube and window

Question 15

what does PBL stand for?

Answer 15

positive beam limiting

Question 16

what is PBL?

Answer 16

in DR, when you select an exam it automatically gives you the space for that exam and limits you from going beyond that size

Question 17

flat piece of lead that contains a hole

Answer 17

aperture diaphragm

lead = diaphragm
hole = aperture

Question 18

are apertures used commonly in x-ray?

Answer 18

no, but may be present in dental settings

Question 19

true/false: aperture diaphragms are adjustable

Answer 19

false, they are not

Question 20

an aperture diaphragm that has an extended flange attached to it

Answer 20

cone/cylinder

Question 21

________ are better at limiting un-sharpness than a ________

Answer 21

cylinders, cone

Question 22

grids ___________; ____ absorb

Answer 22

clean up scatter, lead strip

Question 23

use of grid requires ______

Answer 23

more mAs

Question 24

when do you use a grid?

Answer 24

part is over 10cm, greater than 60 kVp

Question 25

linear pattern of the lead lines of a grid

Answer 25

grid pattern

Question 26

with air-gap technique, mAs increased ____ for every cm of air gap

Answer 26

10%

Question 27

types of grid patterns

Answer 27

linear, crosshatch

Question 28

grid ratio = _____

Answer 28

h/D

Question 29

orientation of the lead lines relative to one another

Answer 29

grid focus

Question 30

types of grid focus

Answer 30

parallel/nonfocused, focused

Question 31

the number of lead lines per unit length

Answer 31

grid frequency

Question 32

with an increased amount of lines, you decrease _______________

Answer 32

visibility of grid lines on x-ray

Question 33

Grid Ratio --> GCF/Bucky Factor No Grid =

Answer 33

1

Question 34

Grid Ratio --> GCF/Bucky Factor 5:1 =

Answer 34

2

Question 35

Grid Ratio --> GCF/Bucky Factor 6:1 =

Answer 35

3

Question 36

Grid Ratio --> GCF/Bucky Factor 8:1 =

Answer 36

4

Question 37

Grid Ratio --> GCF/Bucky Factor 12:1 =

Answer 37

5

Question 38

Grid Ratio --> GCF/Bucky Factor 16:1 =

Answer 38

6