Chapter 11 Notes

Question 1

filtration is the process of

Answer 1

eliminating undesirable x-ray photons by the insertion of absorbing materials into the primary beam

Question 2

filter

Answer 2

any material designed to selectively absorb photons from the x-ray beam

Question 3

most common filter material used

Answer 3

aluminum

Question 4

aluminum filtration can be expressed in terms of

Answer 4

thickness of aluminum equivalency (Al/Eq)

Question 5

half-value layer (HVL)

Answer 5

amount of absorbing material that will reduce intensity of primary beam to one-half its original value

Question 6

filtration is either

Answer 6

inherent or added

Question 7

inherent filtration

Answer 7

filtration that is the result of the composition of the tube and housing; it is a part of these structures

Question 8

added filtration

Answer 8

any filtration that occurs outside the tube and housing and before the IR

Question 9

the collimator device adds approximately _____ to the beam

Answer 9

1 Al/Eq

Question 10

compound filter uses

Answer 10

two or more materials that complement one another in their absorbing ability

Question 11

compensating filter usually designed to

Answer 11

solve a problem involving unequal subject density

Question 12

two common compensating filters

Answer 12

wedge and trough

Question 13

total filtration is equal to

Answer 13

sum of inherent and added filtration

Question 14

filtration is also called

Answer 14

“hardening” the beam

Question 15

filtration increases

Answer 15

average beam energy

Question 16

inherent filtration examples

Answer 16

glass envelope, dielectric oil bath, glass window of housing

Question 17

largest factor of inherent filtration

Answer 17

glass envelope

Question 18

inherent filtration increases as

Answer 18

tube ages

Question 19

compound filtration is also known as using

Answer 19

K-edge filters

Question 20

K-edge filters

Answer 20

each layer absorbs characteristic photons created in previous layer

Question 21

compensation filtration is used to

Answer 21

compensate for variations in parth thickness/density

Question 22

other common filter material

Answer 22

copper

Question 23

filtration beyond _____ has an undesirable effect and is of little clinical value

Answer 23

3 mm/Al