Important Info 2.2

Question 1

Source of electrons?

Answer 1

Negative cathode

Question 2

Low voltage energy source goes to?
a) Filament
b) focusing cup
c) potential energy between copper stem and something

Answer 2

a) Filament

Question 3

Lady had colon cancer and had radiation treatment. Had two perfectly fine kids. However, they’re at increased risk. This increased risk would be _____.
a) Somatic
b) Stochastic
c) Deterministic

Answer 3

b) Stochastic

Question 4

Most harmful biologic change?
a) Coherent scatter
b) Compton scatter

Answer 4

b) Compton scatter

Question 5

Occlusal radiograph size?

Answer 5

4

Question 6

Phosphor plates sizes?

Answer 6

0, 1 , 2, and 4

Question 7

Which is correct for film?

Answer 7

Larger focal length, Constant potential (CD)

Question 8

Tooth not parallel to receptor, beam directed perpendicular to receptor
a) Tooth appears longer
b) Tooth appears shorter
c) Increase magnification, without distortion
d) None of above

Answer 8

b) Tooth appears shorter

Question 9

acute radiation syndrome is ____?

Answer 9

Ionization

Question 10

Tooth not parallel to receptor, beam directed perpendicular to tooth

Answer 10

Tooth appears longer

Question 11

Why is Tungsten good? It has low ____.
a) Cost
b) thermionic radiation
c) heat conductivity

Answer 11

a) Cost

Question 12

PSPP
a) Laser beam and light scintillation
b) Heat and light scintillation
c) Laser beam and heat

Answer 12

a) Laser beam and light scintillation

Question 13

What does film badge do?
a) Records Scatter radiation
b) Background radiation
c) X-ray exposure of the operator

Answer 13

c) X-ray exposure of the operator

Question 14

X tube moves distal, object appears mesially. So what does the tooth move?

Answer 14

Buccally shifted object according to SLOB

Question 15

Dental staff maximum dosage?

Answer 15

50 mSv

Question 16

2012 recall patient with no disease but high caries risk?
a) Bitewing radiograph and selective PA
b) Panoramic and FMX
c) FMX

Answer 16

a) Bitewing radiograph and selective PA

Question 17

Most susceptible
a) Nerve
b) Muscle
c) Bone
d) Hematopoietic

Answer 17

d) Hematopoietic

Question 18

Aluminum filter for 70 KeV?
a) 1.0
b) 1.5
c) 2.0
d) 2.5

Answer 18

b) 1.5

Question 19

Filtration
a) Removes low kEV
b) Reduces the average energy

Answer 19

a) Removes low kEV

Question 20

Largest source of man-made radiation exposure?
a) Nuclear weapons
b) X-ray
c) Ionizing
d) Alpha particles
e) Beta particles

Answer 20

b) X-ray

Question 21

When do we treat a pregnant patient?
a) Emergency pain
b) Routine checkup, etc.

Answer 21

a) Emergency pain

Question 22

Answer 22

topographic mandibular occlusal radiograph

Question 23

Answer 23

Waters’ (occipitomental) skull radiograph

Question 24

What leads to image distortion the most?
a) Horizontal angulation
b) Increased Receptor-object distance
c) Decreased Receptor-object distance

Answer 24

a) Horizontal angulation

Question 25

Skin from therapeutic radiation
a) direct
b) Semi direct
c) Indirect
d) Trans indirect

Answer 25

a) direct

Question 26

Radiation Caries

Answer 26

a) indirect

Question 27

Relative biological harm

Answer 27

equivalent dose

Question 28

Measurement of energy for threshold ion pairs
a) Effective
b) Equivalent
c) Absorbed
d) Exposure

Answer 28

d) Exposure

Question 29

Cotton roll image

Answer 29

Cotton below the blue thing

Question 30

What acute is the most lethal?

Answer 30

CNS

Question 31

Factors enhancing effects of x-radiation
a) Increased oxygen tension
b) Decrease dose
c) Older patient
d) Decrease mitotic rate
e) Specialized cells/mature cells

Answer 31

a) Increased oxygen tension

Question 32

Effect of radiation in the oral cavity?
a) Loss of taste
b) Excess saliva
c) Excess fluid

Answer 32

a) Loss of taste

Question 33

Osteoradionecrosis question about damage?
a) Disruption in the vasculature of osseous structures
b) Decrease trabecular bone pattern

Answer 33

a) Disruption in the vasculature of osseous structures

Question 34

Coronal damage is due to

Answer 34

Indirect effects

Question 35

Increase magnification would be:

Answer 35

a) Short source-object distance
b) Long object-receptor distance

Question 36

Answer 36

inferior border of the mandible

Question 37

Answer 37

coronoid process

Question 38

Answer 38

anterior nasal spine

Question 39

Answer 39

external oblique ridge
- anterior border of the ramus