Prime factors week 4

Question 1

Prime factors are

Answer 1

factors/techniques that are under direct control of the tech

Question 2

What are the 4 Prime factors

Answer 2

mA
kV
distance
Time (S)

Question 3

Quantity is

Answer 3

measure of number of photons in the beam

Question 4

Quantity is also known as

Answer 4

intensity
exposure
density

Question 5

for quantity, the unit of measurement is

Answer 5

roentgen

Question 6

factors that directly affect quantity are

Answer 6

mAs
kV
Distance
filtration

Question 7

quality is the measurement of the

Answer 7

penetrating ability of the beam (describes the distance an x-ray beam travels in matter)

Question 8

quality is numerically represented by

Answer 8

the half-value layer

Question 9

factors that directly affect x-ray quality are

Answer 9

kV

filtration

Question 10

mAs is the measurement of

Answer 10

x-ray tube current (the # of electrons traveling from the cathode to the anode per second)

Question 11

mA is directly _ to tube current

Answer 11

proportional

Question 12

the # of x-rays created at the target is a product of the electrons crossing the tube and how long the electrons are allowed to cross (mA x S)

Answer 12

reciprocity law

Question 13

mAs is the primary controller of

Answer 13

film density

Question 14

increasing kV will cause an increase in the

Answer 14

speed and energy of the electrons applied across the tube

Question 15

kV affect quantity why

Answer 15

more interactions occur at the target when kV increases

Question 16

kV affects quality of the beam why

Answer 16

because each electron has more energy (greater penetrability)

Question 17

increasing kV by 15% will cause a _ in exposure, the same effect as _ mAs and what rule does this apply to

Answer 17

doubling
doubling
15% rule

Question 18

kV adjustments should not be used to control _

Answer 18

density

Question 19

kV determines the _ of the x-ray beam

Answer 19

penetrating ability

Question 20

as kV is increased , the wavelength _ and x-ray becomes _ penetrating

Answer 20

decreases

more

Question 21

as kV is decreased, the wavelength _ and x-ray become _ penetrating

Answer 21

increases

less

Question 22

penetrating ability of the x-rays also determines the

Answer 22

’s of x-rays exiting the pt. and striking the film

Question 23

(Distance) x-ray photons in the primary beam will spread out from their source and become _ concentrated, as a result x-ray intensity will _ as the distance from the tube is increased

Answer 23

less

decrease

Question 24

the relationship between distance and x-ray quantity is described in the

Answer 24

inverse square law

Question 25

what is the formula used to compensate for film density changes when distance is changed

Answer 25

exposure maintenance formula (direct square law)

Question 26

for x-ray emission spectrum the further to the right, the _ energy, the _ the curve, the _the quantity

Answer 26

higher
higher
higher