Chapter 12 Notes

Question 1

prime factors

Answer 1

mAs, kVp, and distance

Question 2

x-ray emission can be described in terms of both its

Answer 2

quantity (amount) and quality (penetrability)

Question 3

x-ray quantity is affected by

Answer 3

mAs, distance, kVp, and filtration

Question 4

x-ray quality is affect by

Answer 4

kVp and filtration

Question 5

mAs is directly proportional to

Answer 5

number of x-ray photons created in tube

Question 6

kilovoltage affects

Answer 6

both quantity and quality

Question 7

if kVp is doubled

Answer 7

x-ray quantity would increase by a factor of 4

Question 8

15% rule

Answer 8

an increase in kVp by 15% will cause and approximate doubling of exposure; to maintain exposure, mAs must be reduce to one-half its original value

Question 9

third prime factor

Answer 9

distance from actual focal spot to IR

Question 10

quantity of x-ray photons is inversely proportional to

Answer 10

square of the distance

Question 11

quantity is measured in

Answer 11

roentgens (R)

Question 12

quality is numerically represented by

Answer 12

HVL

Question 13

changing the current to the filament

Answer 13

changes number of electrons released through thermionic emission

Question 14

unit of current

Answer 14

ampere (A); 1 A = 1 C/sec (coulomb)

Question 15

short exposure times useful in

Answer 15

reducing motion artifacts

Question 16

mAs reciprocity

Answer 16

same IR exposure will result from different mA and time selections, provided that mAs totals are equal

Question 17

more density =

Answer 17

darker image

Question 18

less density =

Answer 18

light film image

Question 19

brightness

Answer 19

how dark or light digital image appears on monitor

Question 20

kVp should not be used to control

Answer 20

IR exposure

Question 21

as SID increases, beam intensity _____

Answer 21

decreases

Question 22

inverse square law

Answer 22

I1/I2 = D2 (squared)/D1(squared

Question 23

doubling the distance reduces the beam intensity by a factor of

Answer 23

4

Question 24

density maintenance formula

Answer 24

mAs1/mAs2 = D1 (squared)/D2 (squared)