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Oral Radiology > EXAM III > Flashcards

EXAM III Flashcards

1
Q

Unit of effective dose:

A

Rem

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2
Q

High electron generating then stops:

A

tungsten target

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3
Q

Cells resistant to radiation will:

A

low capacity of of reproduction, more differentiation

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4
Q

Increase in cone length will:

A

increase sharpness, higher density

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5
Q

What image is between x-ray SOURCE and rotation center:

A

Ghost image

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6
Q

Does not cause ionization:

A

coherent

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7
Q

Objet mots distal, source moves distal:

A

lingual

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8
Q

What is the tissue modification factor?

A

effective dose

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9
Q

Factors affecting caries presentation:

A

angle of x-ray beam and degree of cavitation

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10
Q

What an intraoral radiograph sign of present of past perio disease?

A

alveolar bone at furcation of molar

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11
Q

No threshold=

A

cancer

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12
Q

What is in the cathode?

A

filament and focusing cup

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13
Q

Mesial of #30:

A

within physiologic limits

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14
Q

The narrowest portion of the focal trough is:

A

incisal area

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15
Q

Central plane of image layer:

A

focal trough

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16
Q

Predisposition to perio disease?

A

tilted/rotated

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17
Q

What is the distortion if the teeth are located outside of the central plane TOWARDS the ROTATION CENTER:

A

stretched wide in the horizontal direction

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18
Q

What effects caries diagnosis?

A

both vertical and horizontal angulation

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19
Q

A short object to receptor distance will decrease unsharpness; smaller focal spot increases usharpness

A

first true; second false

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20
Q

Hard palate superimposed on the maxillary roots:

A

chin up

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21
Q

Increasing KeV does ____ energy of photon and ____ penetration

A

increases; higher

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22
Q

What film size do you use for occlusal radiographs?

A

PSPP and conventional

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23
Q

What does DICOM stand for?

A

digital imaging and communications in medicine

24
Q

What is the focusing cup made of?

A

molybdenum

25
What does the LOW voltage power supply heat?
filament
26
Who discovered the first intraoral radiograph?
Otto walkhoff
27
Is produced when electrons interact with atoms of the target:
bremsstrahlung radiation
28
Why is tungsten used as the target material?
high radiation coefficient
29
What the rectifier do?
changes the voltage from AC current
30
If the X-ray tube is set at 60 kVp, then the max voltage is:
60 kEv
31
What skull radiograph is used to identify growth and development?
lateral cephalometric
32
MPD measures threshold for:
ionizing radiation
33
What skull radiograph is used to evaluate facial asymmetries?
posteroanterior cephalometric
34
Where do you place the beam for a lateral maxillary occlusal projection?
just below the lateral cantos of the eye
35
What does increasing source-to-object distance do?
decreases magnification
36
When do you take radiographs on a pregnant woman?
ONLY in emergent situation
37
What is the best radiograph for interproximal caries diagnosis?
Horizontal BW with open contacts
38
What skull radiograph is used to identify the maxillary sinuses?
waters
39
How does something that is anterior to the focal trough appear?
narrower
40
Inverse square low: if the distance is tripled the intensity:
decreases by 9
41
Something in the focal trough will appear:
reasonable well-defined
42
Compared to CCD, CMOS is:
faster to digitize
43
What receptor has the LEAST radiation dose?
CCD
44
What is located between the SOURCE and center of rotation?
ghost image
45
What is true about panos?
multiple centers of rotation
46
What is high contrast?
short gray scale
47
What is true regarding panos?
unequal magnifications
48
If you decrease voltage from 70 kVp to 60 kVp, then you:
decrease density and increase contrast
49
What is the 2012 ADA recommendation for an adult new patient at a high caries risk?
Biteweings every 12-18 months
50
When are electrons decelerated to produce x-rays?
when hitting the tungsten target
51
Thermionic emission does what?
heats up and emits electrons
52
Which of the following interactions causes biologic effects?
compton scatter
53
Low contrast means:
more shades of grey
54
____ dose is the threshold to creat a pair of ions:
exposure
55

Oral Radiology (21 decks)

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