chapter 10, 11, 15

Question 1

technique factors for reducing patient dose

Answer 1

1. keep exposure time short (reduces motion)
2. improve quality (contrast) by increasing kVp
3. control quantity

Question 2

control of scatter radiation

Answer 2

1. collimate the primary beam to area of interest
2. reduce field size
3. correct for patient thickness
4. use grid to reduce scatter

Question 3

digital imaging

Answer 3

1. rules of kVp and mAs don’t apply as much

2. dose creep

Question 4

dose creep

Answer 4

tendency for technologist to get lazy

-don’t change kVp and mAs but adjust on computers; allows patient dose to go up

Question 5

dose reduction techniques

Answer 5

1. do not repeat scans due to brightness or contrast
2. overexposed images do not need repeating
3. computer cannot compensate for noise or low resolution

Question 6

technique creep

-for a given size

Answer 6

• adjust settings for patient size

- slowly increase kVps and decrease mAs for optimum image