M2L4 grid formulas

Question 1

what is contrast improvement factor (k)

Answer 1

a comparison of image contrast w and w/o a grid

Question 2

what is the formula for contrast improvement factor (k)

Answer 2

k = radiographic contrast w grid/ radiographic contrast w/o grid

Question 3

what does it mean if k = 1? what if k = 1.5?

Answer 3

1- no improvement w grid
1.5- the contrast is doubleed when grid is used

Question 4

why is k higher for higher grid ratios

Answer 4

bc higher grid ratios get rid of more scatter

Question 5

what is the bucky facotr (B)

Answer 5

measurement of how much the use of a grid increases patient dose in x-ray imaging.

Question 6

increas grid ratio does what to bucky factor

Answer 6

increases

Question 7

increase in kVp does what to bucky factor

Answer 7

increases it

Question 8

increase in B =

Answer 8

increase patient dose

Question 9

no grid

Answer 9

70 kVp-1
90 kVp- 1
120 kVp- 1

Question 10

5:1

Answer 10

70 kVp-2
90 kVp- 2.5
120 kVp- 3

Question 11

8:1

Answer 11

70 kVp-3
90 kVp- 3.5
120 kVp- 4

Question 12

12:1

Answer 12

70 kVp-3.5
90 kVp- 4
120 kVp- 5

Question 13

16:1

Answer 13

70 kVp-4
90 kVp- 5
120 kVp- 6

Question 14

whats the formula for bucky factor

Answer 14

mAs w grid/ mAs w/o grid

mAs1/mAs2 = B1/B2
mAs 1 =B1/
mAs2 = B2