7. X-ray Emission

Question 1

Refers to the number of x-rays or intensity of the beam usually expressed in mR or mR per mAs

Answer 1

Quantity

Question 2

Factors that Affect X-ray Quantity

Answer 2

o mAs
o kVp
o Distance
o Filtration

Question 3

is just a measure of the total number of electrons that travel from cathode to anode

Answer 3

mAs

Question 4

mAs =

Answer 4

mC (milli columb)

Question 5

1 C =

Answer 5

6.25 x 10^18 electrons

Question 6

Refers to the penetrating qualities of the x-ray beam and is expressed by kVp or HVL

Answer 6

Quality

Question 7

Factors that Affect X-ray Quality

Answer 7

o kVp

o Filtration

Question 8

The Thickness of an absorber needed to reduce the intensity of the x-ray beam into half of its
original value

Answer 8

Half-Value Layer (HVL)

Question 9

product of current and time

Answer 9

mAs (milliamperage per second)

Question 10

factor to adjust if you want to increase or decrease the energy of x-ray or it’s penetrability

Answer 10

kVp (kilovoltage peak)

Question 11

Space between the source of x-ray and IR (film)

Answer 11

Distance

Question 12

As distance of the patient from the source ______, the intensity/quantity of the x-rays that reach the
target ______; according to inverse square law.

Answer 12

increases,

decreases

Question 13

Removal of flawed x-rays

Answer 13

Filtration

Question 14

filtration occurs in x-ray tube glass

Answer 14

inherent filtration

Question 15

can manually place between the protective housing between the x-ray tube window and
the collimator, usually made up of aluminum; can come with various shape and it also depends with your purpose

Answer 15

added filtration

Question 16

relationship between x-ray quantity and mAs

Answer 16

Directly Proportional

Question 17

electrons that travels from cathode to anode

Answer 17

Projectile electrons

Question 18

relationship between quantity and kVp

Answer 18

Directly Proportional

Question 19

also affects the number of electrons that will reach anode and eventually the patient and IR.

Answer 19

kVp

Question 20

relationship between X-ray quantity and distance

Answer 20

Inversely Proportional

Question 21

relationship between X-ray quantity and distance (aka)

Answer 21

Inverse Square Law

Question 22

square law relationship

Answer 22

Directly Proportional

Question 23

Added filtration _____ the intensity/quantity of x-rays

Answer 23

decrease

Question 24

Added filtration _____ the quality of x-rays

Answer 24

increase

Question 25

Standard unit for HVL is

Answer 25

millimeter of aluminum

Question 26

quantity of x-rays

decrease as SID increases

Answer 26

Inverse square law

Question 27

X-rays are

Answer 27

divergent

Question 28

refers to x-ray quantity (the number of x-ray photons in the beam)

Answer 28

X-ray intensity

Question 29

Relationship between kVp and X-ray quantity aka

Answer 29

Direct Square Law

Question 30

is adjusted to compensate reduction from

distance changes and to maintain the exposure.

Answer 30

mAs

Question 31

is the most appropriate in defining quality of x-rays

Answer 31

HVL

Question 32

Average photon energy is increased with

Answer 32

filtration