Differential Absorption

Question 1

where is the focal track? (anode or cathode)

Answer 1

on the anode

Question 2

what is the target (specifically)

Answer 2

a small portion on the focal track

Question 3

the radiation between the source and the patient is called what?

Answer 3

primary radiation

Question 4

the radiation between the patient and the IR is called what?

Answer 4

remnant radiation

Question 5

the radiation that does not hit the IR is called what?

Answer 5

scatter radiation

Question 6

what is the SOD?

Answer 6

source to object distance

Question 7

what is the SID?

Answer 7

source to image receptor distance

Question 8

what is the OID

Answer 8

object to image receptor distance

Question 9

the value is WHITE when there is ____

Answer 9

absorption

Question 10

the value is BLACK when there is _____

Answer 10

no absorption

Question 11

what is the bright spot on the left lung?

Answer 11

the cardiac silhouette

Question 12

what is the definition of attenuation?

Answer 12

any process that reduces the intensity of the beam

Question 13

what is the Z variable (in absorption)

Answer 13

the effective atomic numbers

Question 14

bone Z = ?

Answer 14

13.8

Question 15

soft tissue Z = ?

Answer 15

7.4

Question 16

water Z = ?

Answer 16

5.9

Question 17

what units represent physical density? (in absorption)

Answer 17

g/cm^3

Question 18

what is the PD of bone?

Answer 18

1.8 g/cm^3

Question 19

what is the PD of soft tissue?

Answer 19

1.0 g/cm^3

Question 20

what is the PD of air?

Answer 20

0.001 g/cm^3

Question 21

what is the relationship between kVp and absorption?

Answer 21

inverse relationship

Question 22

What effect does mAs have on absorption?

Answer 22

none

Question 23

why is the aluminum step wedge useful?

Answer 23

it has a consistent Z and OD, only verying in thickness