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Oral Health Assessment > Radiography > Flashcards

Radiography Flashcards

0
Q

What is the purpose of aluminium filter

A

Remove long wavelength xray photons

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1
Q

Intensity of Xray beam will decrease as the distance from the X-ray tube to the film is increased

A

Inverse square law

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2
Q

Purpose of collimator

A

Narrow the beam to a specific diameter

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3
Q

What is density

A

Degree of darkness or blackness on the film

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4
Q

Error for dark films

A

Over developing or overly warm temperature

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5
Q

X-ray and children

A

The exposure factors may be slightly reduced

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6
Q

What is definition

A

Detail and clarity of the outline of structures.

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7
Q

What is contrast

A

Difference between dark and light areas

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8
Q

Incorrect horizontal angulation causes…

A

Overlapping image of teeth

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9
Q

Labial mounting method.

A

Patients left is your right

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10
Q

Image or picture produced by X-rays

A

Radiograph

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11
Q

The making or radiographs by exposing and processing X-ray films

A

Radiography

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12
Q

The study of x-radiation

A

Radiology

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13
Q

The original term roentgen applied to the invisible ray he discovered

A

X-ray

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14
Q

Anything that occupies space and has mass

A

Matter

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15
Q

The ability to do work

A

Energy

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16
Q

Generated by the radiography process

A

Energy exchange

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17
Q

The formation of ion pairs

A

Ionisation

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18
Q

A small particle able to penetrate matter

A

X-ray photon

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19
Q

Process by which unstable atoms undergo decay in an effort to obtain nuclear stability

A

Radioactivity

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20
Q

Amount of current passing though wires of the circuit

A

mA

21
Q

determines the available number of free electrons at cathode filaments

A

mA

22
Q

Determines amount of X-rays that will be produced

A

mA

23
Q

Measures the voltage across the X-ray tube

A

kVp

24
Q

Determine the speed it electrons travelling towards the target on the anode

A

kVp

25
Q

Determines penetrating ability of the X-rays produced

A

kVp

26
Q

Determines the duration of exposure

A

Timer

27
Q

Unit of measurement of the timer

A

Mili-seconds

28
Q

Incorrect horizontal angulation causes

A

Overlapping

29
Q

Incorrect ventricle angulation causes

A

Elongation

30
Q

Diagnostic quality radiograph

A

Obtaining the highest quality radiograph while maintaining the lowest possible radiation exposure risk for the patient

31
Q

Lead layer

A

Absorbs scatter radiation and reduces clarity of image

32
Q

Purpose of film processing

A

Produce diagnostic quality radiographs that can support oha

33
Q

Psp plate storage vs radiography film

A

Psp plate- stores info as a digital image

Radiography film- latent image that is transferred into a visible permanent image

34
Q

Radiolucency

A

Appears darker on film eg soft tissue and air space

Structures that permit the passage of X-rays with little or nonresistance

35
Q

Radiopacity

A

Appears light on the film eg dentine, enamel, bone

Dense structures that absorb if resist the passage of X-rays

36
Q

Error- film fog

A

White light leaking into dark room

37
Q

Error- light image

A

Underdevelopment of film. Under exposure

38
Q

3 principles of radiation

A

Justification- must be of benefit to the patient
Optimisation- alara principles, keep exposure as low as reasonably achievable
Limitation- maximise permissible dose

39
Q

Properties of X-rays

A 
Travel at the speed of light
Invisible
No charge
Travel in straight lines
Interact with matter causing ionisation
No mass or weight 
Penetrate opaque tissues & structures 
Absorb biological tissue
Absorb radiographic film emulsion
40
Q

X-ray interaction with matter

A

Beam of X-ray passes through mater
Energy transferred from X-ray to atoms of material through which it passes
X-ray is weakened and gradually disappears
Disappearance= absorption of X-rays
Method of absorption= ionisation

41
Q

Possibilities of interaction of X-rays with matter

A

No interaction
Coherent scattering
Photoelectric effect
Compton effect

42
Q

Deterministic effect (non-stochastic)

A

Severity of the change is dependent on the dose

43
Q

Stochastic effect

A

Based on the probability of occurrence rather than the severity of the change.
Cancer all or nothing occurrence

44
Q

Alara

A 
As
Low
As
Reasonably 
Possible
45
Q

Qualities of an operator: communication

A

Explain what you are doing

Reassure about radiograph

46
Q

Qualities of an operator: your education

A

Continue your education

Understand how X-rays work

47
Q

Qualities of an operator: your judgment

A

Is it needed?

Which X-ray should you take

48
Q

Your understanding of contrast

A

The visual difference between shades from black to white on a radiograph. An image with good contrast will contain black white and enough grey shades to differentiate between structures and their conditions

49
Q

Your understanding of density

A

The overall darkening of a radiograph. X-rays that appear light is said to have less density. X-rays that appear dark is more dense

Oral Health Assessment (1 decks)

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