density and contrast in Rad.

Question 1

In density what is the prime factor?

Answer 1

mAs

Question 2

In density what is the Controlling factor?

Answer 2

mAs

Question 3

what is density of a radiographic image?

Answer 3

overall darkness of the image

Question 4

how is scatter related to density?

Answer 4

Directly related (both will either increase or decrease)

Question 5

what is the relationship between SID and Density ?

Answer 5

Indirectly related ( one increases and the other decreases)

Question 6

how is patient size and density related?

Answer 6

Indirectly related (one increases and the other decreases)

Question 7

what happens when a filter is used related to patient exposure?

Answer 7

the filter reduces the amount of photons (mAs) exposing the patients skin.

Question 8

when filtration is added, what happens to density?

Answer 8

density will increase b/c of kVp condensation

Question 9

as filtration is added what happens to kVp?

Answer 9

it will need to increase to compensate

Question 10

when a grid is added what happens to Density?

Answer 10

density wil decrease

Question 11

focal spot and Density have what relation?

Answer 11

no relation

Question 12

when a grid is added what happens to scatter production?

Answer 12

nothing will happen to scatter production

Question 13

when adding a grid what will happen to scatter reaching the IR?

Answer 13

less scatter will reach the IR

Question 14

As OID increases what happens to Density?

Answer 14

density will decrease

Question 15

when increasing OID what will happen to scatter production?

Answer 15

nothing will happen

Question 16

when Increasing OID what happen to scatter hitting the IR?

Answer 16

Density will decrease b/c less scatter will hit the IR

Question 17

In digital what controls Density?

Answer 17

Window leveling

Question 18

what is contrast?

Answer 18

difference between adjacent density

Question 19

what is long scale contrast?

Answer 19

more grays [/////////]

Question 20

what is short scale contrast?

Answer 20

Black and white [/ ]

Question 21

for every Inch of OID how much do I increase SID?

Answer 21

7in

Question 22

Does kVp control contrast in digital?

Answer 22

No

Question 23

will short or long scale contrast have higher kVp?

Answer 23

Long scale

Question 24

long scale contrast will have what contrast?

Answer 24

Low rad. contrast

Question 25

short scale contrast will have what contrast?

Answer 25

High rad. contrast

Question 26

what controls contrast in digital?

Answer 26

Look-up table ; histogram

Question 27

what is beam restriction?

Answer 27

collimation

Question 28

does AEC control density?

Answer 28

no, it will be the density knob

Question 29

what does beam restriction do to contrast

Answer 29

it will Increase contrast which means [B/W]

Question 30

when adding bean restriction scatter production will?

Answer 30

decrease

Question 31

when adding beam restriction is added scatter hitting the IR will?

Answer 31

decrease

Question 32

what controls contrast in the digital monitor?

Answer 32

Window width= Dynamic rage

Question 33

as OID increase what happens to rad. contrast?

Answer 33

Increased contrast; [B/W]; short scale

Question 34

what is the 15% rule?

Answer 34

increase kVp by 2X which increases Density