Important Info 2.2 Flashcards
Source of electrons?
Negative cathode
Low voltage energy source goes to?
a) Filament
b) focusing cup
c) potential energy between copper stem and something
a) Filament
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
b) Stochastic
Most harmful biologic change?
a) Coherent scatter
b) Compton scatter
b) Compton scatter
Occlusal radiograph size?
4
Phosphor plates sizes?
0, 1 , 2, and 4
Which is correct for film?
Larger focal length, Constant potential (CD)
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
b) Tooth appears shorter
acute radiation syndrome is ____?
Ionization
Tooth not parallel to receptor, beam directed perpendicular to tooth
Tooth appears longer
Why is Tungsten good? It has low ____.
a) Cost
b) thermionic radiation
c) heat conductivity
a) Cost
PSPP
a) Laser beam and light scintillation
b) Heat and light scintillation
c) Laser beam and heat
a) Laser beam and light scintillation
What does film badge do?
a) Records Scatter radiation
b) Background radiation
c) X-ray exposure of the operator
c) X-ray exposure of the operator
X tube moves distal, object appears mesially. So what does the tooth move?
Buccally shifted object according to SLOB
Dental staff maximum dosage?
50 mSv
2012 recall patient with no disease but high caries risk?
a) Bitewing radiograph and selective PA
b) Panoramic and FMX
c) FMX
a) Bitewing radiograph and selective PA
Most susceptible
a) Nerve
b) Muscle
c) Bone
d) Hematopoietic
d) Hematopoietic
Aluminum filter for 70 KeV?
a) 1.0
b) 1.5
c) 2.0
d) 2.5
b) 1.5
Filtration
a) Removes low kEV
b) Reduces the average energy
a) Removes low kEV
Largest source of man-made radiation exposure?
a) Nuclear weapons
b) X-ray
c) Ionizing
d) Alpha particles
e) Beta particles
b) X-ray
When do we treat a pregnant patient?
a) Emergency pain
b) Routine checkup, etc.
a) Emergency pain
topographic mandibular occlusal radiograph
Waters’ (occipitomental) skull radiograph
What leads to image distortion the most?
a) Horizontal angulation
b) Increased Receptor-object distance
c) Decreased Receptor-object distance
a) Horizontal angulation
Skin from therapeutic radiation
a) direct
b) Semi direct
c) Indirect
d) Trans indirect
a) direct
Radiation Caries
a) indirect
Relative biological harm
equivalent dose
Measurement of energy for threshold ion pairs
a) Effective
b) Equivalent
c) Absorbed
d) Exposure
d) Exposure
Cotton roll image
Cotton below the blue thing
What acute is the most lethal?
CNS
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
a) Increased oxygen tension
Effect of radiation in the oral cavity?
a) Loss of taste
b) Excess saliva
c) Excess fluid
a) Loss of taste
Osteoradionecrosis question about damage?
a) Disruption in the vasculature of osseous structures
b) Decrease trabecular bone pattern
a) Disruption in the vasculature of osseous structures
Coronal damage is due to
Indirect effects
Increase magnification would be:
a) Short source-object distance
b) Long object-receptor distance
inferior border of the mandible
coronoid process
anterior nasal spine
external oblique ridge
- anterior border of the ramus
