IR Exposure

Question 1

What is needed to produce a decent image

Answer 1

IR needs to absorb the same exposure

Question 2

Back then if an image was dark what did that indicate

Answer 2

Too much exposure

Question 3

Back then if the image was bright, what did that indicate

Answer 3

That the image had too little exposure

Question 4

What do we use today to determine proper IR exposure

Answer 4

By the exposure number, exposure indicator, deviation index

Question 5

Does IR exposure effect technique

Answer 5

No

Question 6

What is the number for an ideal exposure

Answer 6

0

Question 7

If DI is more than +3 what does that mean

Answer 7

Exposure too high
Need ti repeat

Question 8

What does it mean if DI is -3

Answer 8

Not enough exposure
Need to repeat

Question 9

How are Deviation index and exposure related

Answer 9

Directly

Question 10

If you double your exposure what happens to DI

Answer 10

Goes up by 3

Question 11

If you cut your exposure in half what happens to DI

Answer 11

Goes down -3

Question 12

How do you find DI after image is in pack

Answer 12

Hit “H”

Question 13

Where is exposure indicator calculated at

Answer 13

The region of interest (ROI)

Of exam selected

Question 14

What are the 2 controlling factors for IR exposure

Answer 14

mAs and kVp

Question 15

As mAs and kVp increases IR exposure…

Answer 15

Increases (diretly proportional relationship)

Question 16

Exposure indicator depends on what

Answer 16

Dose

Question 17

mAs is the product of what

Answer 17

mA and time

Question 18

To increase mAs what has to happen

Answer 18

mA or time is increased

Question 19

What is the reciprocity law

Answer 19

When mA and time are adjusted to maintain same mAs

if one goes up/ the other goes down

Question 20

What’s the 50% rule
The double / half rule

Answer 20

A double or half in mAs is needed to make a significant change

Question 21

If we double the mAs what will the DI be

Answer 21

+3
increase by 3

Question 22

If I divide my mAs by half, what will the DI be

Answer 22

-3
decrease by 3

Question 23

A smaller change in kVp has what kind of effect of IR exposure

Answer 23

Large effect

Question 24

What’s the 15% rule

Answer 24

Increasing or decreasing kVp by 15% will increase or decrease your IR exposure

Question 25

A change of 15% in kVp is equal to what

Answer 25

Double/ half in mAs

Question 26

An increase of 15% in kVp will make DI what

Answer 26

+3

Question 27

A decrease of 15% in kVp will make DI what

Answer 27

-3

Question 28

As kVp goes up mAs goes down to maintains what

Answer 28

IR exposure

15/50 rule

Question 29

Which rule do you use if DI is out of range

Answer 29

50 % rule for mAs
Or
15% rule for kVp

Question 30

Which rule do you use if DI was in range

Answer 30

15/50 rule
Adjust mAs and kVp to keep pt dose low

Question 31

DI and exposure have what kind of relationship

Answer 31

direct