Important Info 2.0 Flashcards
incisive foramen
mandibular canal
nose
lingual foramen
internal oblique ridge
external oblique ridge
mental ridge
intermaxillary suture
genial tubercles
nasolabial fold
mental foramen
What was wrong with this radiograph?
foreshortening
What was wrong with this radiograph?
Backwards/Reversed Placement
Definition of maximum permissible dose
That amount of radiation which in the light of present knowledge will not produce any serious, harmful, or deleterious effects on the individual receiving it.
What is the most likely risk of radiation?
- leukemia and thyroid cancer
Factors that increase biologic effect of x radiation?
O2 and young age
SLOB rule states…
- moved image in the distal direction
- object moved mesially so it was buccal
Same lingual, opposite buccal
What increases magnification?
THESE THINGS DECREASE MAGNIFICATION
- Source-to-object distance should be as long as possible.
Rule #2.
- Object-to-receptor distance should be as short as possible.
What increases distortion?
THESE THINGS MINIMIZE DISTORTION
Rule #1:
- Object and receptor should be parallel.
Rule #2:
- Beam should be perpendicular to object and receptor
Know the magnification and sharpness rule
THESE THINGS IMPROVE SHARPNESS
Rule #1.
- Radiation source should be as small as possible.
Rule #2.
- Source-to-object distance should be as long as possible.
Rule #3.
- Object-to-receptor distance should be as short as possible.
THESE THINGS DECREASE MAGNIFICATION
- Source-to-object distance should be as long as possible.
- Object-to-receptor distance should be as short as possible.
According to FDA 2012, what x-rays to take for low caries risk patient?
Bitewings
According to FDA 2012, what xrays to take for new patient?
individualized radiographic exam
Indirect effect of radiation exposure to oral cavity?
radiation caries
Best way to reduce radiation exposure to a patient?
increase receptor speed
For x-radiation, absorbed dose is ________ equivalent dose
equal to
A patient got cancer but her kids don’t have it. What type of radiation effect is this?
somatic effect
For radiation higher than x-radiation the absorbed dose is _________ to equivalent dose
lower
Give an example of background radiation
cosmic
Which of these leads to shape distortion?
none of the above
What leads to biological damage?
photoelectric effect
Hemopoetic death is caused by…
sepsis
Dental front office worker has a maximum permissible dose of…
50 mSV
5.0 Rem
During pregnancy, when are x-rays taken?
Diagnosing acute painful problems
What does penumbra mean?
sharpness/fuzziness
What does lowering the kVP do?
increases contrast and decreases density
Know how to maximize sharpness and minimize magnification and distortion
MAXIMIZE SHARPNESS
Rule #1.
- Radiation source should be as small as possible.
Rule #2.
- Source-to-object distance should be as long as possible.
Rule #3.
- Object-to-receptor distance should be as short as possible.
MINIMIZE MAGNIFICATION
- Source-to-object distance should be as long as possible.
- Object-to-receptor distance should be as short as possible.
Definition of effective dose?
specifically calculates risks of radiation to human tissues on a common scale
- modified by tissue weight factor
Definition of absorbed dose
energy absorbed by tissue
Overlapping contacts picture shows…
incorrect horizontal angulation
- mesial to distal
