Quizlet LRA-222 Week 2 Review'

Question 1

What are the Primary Exposure Technique Factors?

Answer 1

mA, time, kVp

Question 2

What are the effects of mAs on a digital image in regards to brightness?

Answer 2

mAs does not affect brightness in a digital image

Question 3

What is the relationship between KVP and Subject contrast?

Answer 3

• High kVp creates LOW subject contrast
• Low kVp creates HIGH subject contrast

Question 4

Using Excessive KVP in Digital imaging can result in what?

Answer 4

• Increased IR exposure
• Increased scatter reaching the IR
• Decreased contrast

Question 5

To maintain the same exposure to the IR, If SID is increased, the mAs must be increased (T/F)?

Answer 5

TRUE

Question 6

Define GRID

Answer 6

a device placed between IR & patient to help clean up scatter exiting the patient

Question 7

Reducing the scatter radiation to an IR results in what type of Contrast?

Answer 7

higher radiographic contrast

Question 8

What should be done to minimize patient exposure?

Answer 8

Using a technique chart

Question 9

Does higher KVP result in less absorption and more variation in the intensities exiting the patient (T/F)?

Answer 9

False

Question 10

The primary purpose of AEC is to do what?

Answer 10

control the amount of radiation reaching the IR

Question 11

Using a lower mA station during an AEC examination results in?

Answer 11

increase exposure time

Question 12

What is a photodiode?

Answer 12

A device made from semiconductor materials that absorb light over a characteristic wavelength range

Question 13

What is a photomultiplier?

Answer 13

An electric device that converts visible light energy into electrical energy

Question 14

When using a Grid should one increase or decrease their technique?

Answer 14

increase technique

Question 15

When using AEC you don’t have to worry about your collimation? T/F

Answer 15

FALSE

Question 16

1. Which of the following is not a primary exposure technique factor?
   A. KVP
   B. Time of exposure
   C. SID
   D. MA

Answer 16

C. SID

Question 17

2. Which of the following is true regarding the effect of mAs on the brightness of a digital image?
   A. doubling the mAs will increase brightness
   B. halving the mAs will decrease brightness
   C. mAs does not affect brightness in a digital image
   D. doubling the mAs will increase brightness and halving the mAs will decrease brightness

Answer 17

C. mAs does not affect brightness in a digital image

Question 18

3. With digital imaging, if the mAs is too high
   A. the image brightness will appear low (dark)
   B. the image brightness will appear appropriate
   C. the image brightness will appear high (light)
   D. none of these

Answer 18

B. the image brightness will appear appropriate

Question 19

4. What is the relationship between kVp and subject contrast?
   A. high kVp creates low subject contrast
   B. low kVp creates low subject contrast
   C. high kVp creates high subject contrast
   D. kVp does not affect subject contrast

Answer 19

A. high kVp creates low subject contrast

Question 20

5. Using excessive kVp with a digital IR results in
   1 increased IR exposure
   2 increased scatter reaching the IR
   3 decreased contrast
   A. increased IR exposure and increased scatter reaching the IR only
   B. increased IR exposure and decreased contrast only
   C. increased scatter reaching the IR and decreased contrast only
   D. increased IR exposure, increased scatter reaching the IR, and decreased contrast

Answer 20

D. increased IR exposure, increased scatter reaching the IR, and decreased contrast

Question 21

6. To maintain the same exposure to the IR, if the SID is increased, the mAs must be
   A. decreased
   B. increased
   C. left the same
   D. doubled

Answer 21

B. increased

Question 22

7. The device used to absorb scatter radiation in the radiation leaving the patient before it reaches the image receptor is the
   A. cassette
   B. flat panel detector
   C. grid
   D. filter

Answer 22

C. grid

Question 23

8. Reducing the amount of scatter radiation reaching the IR results in
   A. lower radiographic contrast
   B. higher radiographic contrast
   C. improved spatial resolution
   D. reduced spatial resolution

Answer 23

B. higher radiographic contrast

Question 24

9. Which of the following statements is true regarding practices to minimize patient exposure?
   A. The beam should be open as large as the image receptor being used
   B. Grids should be used as much as possible to improve contrast
   C. Use more mAs in digital imaging because the brightness is computer adjusted and it reduces noise
   D. None of these

Answer 24

D. None of these

Question 25

10. Higher kVp results in less absorption and more variation in the intensities exiting the patient
    A. True
    B. False

Answer 25

B. False