Exposure Systems Ch. 32

Question 1

Who was the xray equipment sales rep that saw a need for exposure techniques and formed a society with a code of ethics to become the ASRT?

Answer 1

Ed Jerman

Question 2

Who developed the science part of exposure techniques?

Answer 2

Fuchs

Question 3

Contrast = ?

Answer 3

shades of gray

Question 4

What are to be considered with exposure systems?

Answer 4

1. several choices in exp systems
2. thickness of pt part
3. image processing (F/S vs. digital)

Question 5

In film screen, what controls contrast & influences density?

Answer 5

kVp

Question 6

What controls contrast in digital?

Answer 6

Software

Question 7

Optimal kVp is also known as..

Answer 7

Fixed kVp

Question 8

Optimal or fixed kVp will produce…

Answer 8

acceptable & consistant image contrast

Question 9

What is are advantages of fixed kVp exposure system?

Answer 9

It decreases pt dose b/c kVp is at its max & mAs is small
There is uniform contrast due to consistant kVp levels
Tube life extended due to low mA which = less heat

Question 10

What are disadvantages to a fixed kVp exposure system?

Answer 10

Lower overall contrast

More scatter due to low contrast

Question 11

What are the steps to selecting optimal kVp & variable mAs

Answer 11

1: produce phantom images, 2. Select optimal phantom image, 3. Develop, 4. extrapolate technique chart according to selected exposure system guidelines, 5. perform phantom testing using extrapolated technique chart, 6. perform clinical trials, 7. perform clinical fine-tuning, 8. Continue ongoing fine tuning

Question 12

What does APR mean?

Answer 12

Anatomically programmed radiography