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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
Q

What does the LOW voltage power supply heat?

A

filament

26
Q

Who discovered the first intraoral radiograph?

A

Otto walkhoff

27
Q

Is produced when electrons interact with atoms of the target:

A

bremsstrahlung radiation

28
Q

Why is tungsten used as the target material?

A

high radiation coefficient

29
Q

What the rectifier do?

A

changes the voltage from AC current

30
Q

If the X-ray tube is set at 60 kVp, then the max voltage is:

A

60 kEv

31
Q

What skull radiograph is used to identify growth and development?

A

lateral cephalometric

32
Q

MPD measures threshold for:

A

ionizing radiation

33
Q

What skull radiograph is used to evaluate facial asymmetries?

A

posteroanterior cephalometric

34
Q

Where do you place the beam for a lateral maxillary occlusal projection?

A

just below the lateral cantos of the eye

35
Q

What does increasing source-to-object distance do?

A

decreases magnification

36
Q

When do you take radiographs on a pregnant woman?

A

ONLY in emergent situation

37
Q

What is the best radiograph for interproximal caries diagnosis?

A

Horizontal BW with open contacts

38
Q

What skull radiograph is used to identify the maxillary sinuses?

A

waters

39
Q

How does something that is anterior to the focal trough appear?

A

narrower

40
Q

Inverse square low: if the distance is tripled the intensity:

A

decreases by 9

41
Q

Something in the focal trough will appear:

A

reasonable well-defined

42
Q

Compared to CCD, CMOS is:

A

faster to digitize

43
Q

What receptor has the LEAST radiation dose?

A

CCD

44
Q

What is located between the SOURCE and center of rotation?

A

ghost image

45
Q

What is true about panos?

A

multiple centers of rotation

46
Q

What is high contrast?

A

short gray scale

47
Q

What is true regarding panos?

A

unequal magnifications

48
Q

If you decrease voltage from 70 kVp to 60 kVp, then you:

A

decrease density and increase contrast

49
Q

What is the 2012 ADA recommendation for an adult new patient at a high caries risk?

A

Biteweings every 12-18 months

50
Q

When are electrons decelerated to produce x-rays?

A

when hitting the tungsten target

51
Q

Thermionic emission does what?

A

heats up and emits electrons

52
Q

Which of the following interactions causes biologic effects?

A

compton scatter

53
Q

Low contrast means:

A

more shades of grey

54
Q

____ dose is the threshold to creat a pair of ions:

A

exposure

55
Q
A

Oral Radiology (21 decks)

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