Choi exam 2

Question 1

When optical density of radiograph is too high w/adequate contrast, what would be most appropriate change before retakin

Accepted Answer

Decrease mAs

Question 2

WOTF is NOT considered way of decreasing scatter radiation?

Accepted Answer

Use higher mAs than what technical chart indicates

Question 3

MATCHING: Controlling how long high & low voltage circuits are activated

Accepted Answer

Timer circuit

Question 4

WOTF is FALSE regarding intensifying screens?

Accepted Answer

Requires higher mAS when xray is taken using intensifying screen

Question 5

WOTF events occurs when you press & hold exposure button

Accepted Answer

Electrons travel rom cathode to anode

Question 6

photoelectric effect, x-ray continues to travel reach the x-ray film after interacting w/K shell electron inside pt body

Accepted Answer

False

Question 7

WOTF is NOT considered X-ray interactions with matter

Accepted Answer

Anode heel effect

Question 8

High kVp creates long shades of grey with gradual changes of densities

Accepted Answer

True

Question 9

Accord inverse square law, distance btwn light source & image receptor doubles, intensity/photon density of light dec by

Accepted Answer

A factor of 4

Question 10

__ is defined as unwanted / undesirable absorption of primary xray beams by grid strips due to improper positioning grid

Accepted Answer

Grid cutoff

Question 11

With kVp lower than 70, the majority of x-ray production is from __ interaction

Accepted Answer

Bremsstrahlung

Question 12

WOTF types of generators produces least degree of voltage ripple

Accepted Answer

High frequency

Question 13

Optical density (film density/radiogrpahic density) is linearly proportional to mAS (= doubling mas = doubling density

Accepted Answer

True

Question 14

WOTF is FALSE when you increase kVp

Accepted Answer

Larger cloud of electrons at filament leading to inc in x-ray quantity

Question 15

X-ray w/technical factors of 110 kVp & 400 ma second of exposure time to achieve 200 mAs on large pt, is this safe X-ray

Accepted Answer

No

Question 16

What is device that is placed in Bucky & infront of cassette to reduce amount of scattered radiation striking xray film

Accepted Answer

Grid

Question 17

WOTF is NOT part of 3 main components of x-ray system

Accepted Answer

X-ray film

Question 18

MATCHING: activating filament circuit

Accepted Answer

Prep switch

Question 19

Fast speed film/screen requires less amt of X-rays for same exposure compared to slow speed film screen

Accepted Answer

True

Question 20

X-ray using 50kvp & 20 mas; density is adequate but contrast too high; when retaking WOTF settings will give you better

Accepted Answer

58 kVp, 20 mas

Question 21

The process of converting alternating current to direct current is referred to as

Accepted Answer

Rectification

Question 22

With high kVp, the amount of Compton interactions is much higher than that of photoelectric

Accepted Answer

True

Question 23

WOTF is NOT considered a wya of decreasing penumbra

Accepted Answer

Increase OID

Question 24

To prevent overheating of anode, what min duration.. you need to wait to cool off anode b4 take ext view when

Accepted Answer

6 mins (6 1/2)

Question 25

Wotf is main photo active ingredient of emulsion layer of xray films

Accepted Answer

Silver bromide

Question 26

WOTF is FALSE regarding grids

Accepted Answer

Low ratio grid is more efficient in removing scattered radiation

Question 27

Which circuit utilizes step down transformer

Accepted Answer

Filament Circuit

Question 28

With a set MA, by changing exposure time from 0.5 to 1 second you can double the amount of radiation production

Accepted Answer

True

Question 29

projectile electron knocks inner shell electron of tungsten atom, outer shell falls into empty inner shell as emits xray

Accepted Answer

Characteristic interaction

Question 30

MATCHING: location of electron cloud formation

Accepted Answer

Cathode

Question 31

WOTF buttons help you choose which filament (large or small) will be used for X-ray production

Accepted Answer

MA

Question 32

MATCHING: activating high voltage circuit

Accepted Answer

Exposure switch

Question 33

WOTF combination of mA & seconds produces most amount of x-rays

Accepted Answer

50 ma, 4 seconds

Question 34

WOTF buttons is NOT commonly utilized in modern xray system

Accepted Answer

Line voltage compensator

Question 35

WOTF descriptions is FLASE regarding bremmstrahiung x-ray production?

Accepted Answer

When projectile electrons travel closer to tungsten nucleus = weaker X-rays

Question 36

With a set exposure time, by changing ma form 100 to 20 ma you can double the amount of radiation

Accepted Answer

True

Question 37

Which one of following needs go be changed if you ant to change contrast

Accepted Answer

KVp

Question 38

When x-ray was sot with same kVp, which material btwn A & B is LESS dense

Accepted Answer

B

Choi exam 2

Questions 38

Choi exam 2

Questions 38